阅读说明：本技术 复杂台风气象环境下洪涝灾害风险综合评估方法及预警信息平台 (Flood disaster risk comprehensive assessment method and early warning information platform in complex typhoon meteorological environment ) 是由 白杨 胡坤霖 陈杰 徐刚 朱安峰 章豪 苏宗奎 范全龙 张轶 徐海燕 肖延菊 于 2020-12-08 设计创作，主要内容包括：本发明涉及复杂台风气象环境下洪涝灾害风险综合评估方法及预警信息平台,其特征在于：包括台风暴雨-洪涝灾害风险分析以及台风暴雨-洪涝灾害风险评价；所述台风暴雨-洪涝灾害风险分析通过得出灾害危险性状况,构建承灾体脆弱性程度曲线,确定未来承灾物体产生的最大损失值以及在未来不同时间段发生的概率,包括台风暴雨-洪涝危险性分析、洪涝承灾体脆弱性分析、灾害损失概率分布以及灾害风险情景表征；所述台风暴雨-洪涝灾害风险评价通过风险分析的结果制作灾害风险时间分布表以及得出灾害影响面积和受灾损失评价,包括灾害风险分级、灾害风险图集编制以及灾害风险情景界定；所述评估方法能对不同要素情境地区台风灾害防御提供有力帮助。(The invention relates to a comprehensive assessment method for flood disaster risks in a complex typhoon meteorological environment and an early warning information platform, which are characterized in that: the method comprises the steps of typhoon rainstorm-flood disaster risk analysis and typhoon rainstorm-flood disaster risk evaluation; the typhoon rainstorm-flood disaster risk analysis is used for constructing a disaster-bearing body vulnerability degree curve by obtaining a disaster risk condition, and determining the maximum loss value generated by a future disaster-bearing body and the probability of occurrence in different time periods in the future, wherein the maximum loss value comprises typhoon rainstorm-flood risk analysis, flood disaster-bearing body vulnerability analysis, disaster loss probability distribution and disaster risk situation representation; the typhoon rainstorm-flood disaster risk evaluation makes a disaster risk time distribution table according to the result of risk analysis and obtains disaster influence area and disaster damage evaluation, including disaster risk classification, disaster risk atlas compilation and disaster risk scenario definition; the assessment method can provide powerful help for typhoon disaster prevention in different element situation areas.)

1. A flood disaster risk comprehensive assessment method and an early warning information platform under a complex typhoon meteorological environment are characterized in that: the method comprises the steps of typhoon rainstorm-flood disaster risk analysis, typhoon rainstorm-flood disaster risk evaluation and an early warning information platform; the typhoon rainstorm-flood disaster risk analysis is used for constructing a disaster-bearing body vulnerability degree curve by obtaining a disaster risk condition, and determining the maximum loss value generated by a future disaster-bearing body and the probability of occurrence in different time periods in the future, wherein the maximum loss value comprises typhoon rainstorm-flood risk analysis, flood disaster-bearing body vulnerability analysis, disaster loss probability distribution and disaster risk situation representation; the typhoon rainstorm-flood disaster risk evaluation makes a disaster risk time distribution table according to the result of risk analysis and obtains disaster influence area and disaster damage evaluation, including disaster risk classification, disaster risk atlas compilation and disaster risk scenario definition; and the early warning information platform displays the results of the typhoon rainstorm-flood disaster risk analysis and evaluation.

2. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the typhoon rainstorm-flood risk analysis comprises the steps of acquiring a data source from the intensity information record of historical disaster occurrence, analyzing disaster risk from a point scale system and a surface scale system, and estimating the intensity condition of the disaster occurring in a fixed period in the future; the point scale system and the surface scale system comprise point domain disaster risk analysis and surface domain disaster risk analysis; the 'point' domain disaster risk analysis aims at a single monitoring point, the process rainfall amount value under the typical reappearance period condition is established based on the typhoon storm disaster risk characterization, the maximum annual typhoon process rainfall of the monitoring station is generally a daily rainfall time sequence by adopting the 'hydrological frequency analysis' thought in the hydrology, the rainfall intensity value of the typhoon storm rainfall at the monitoring point under different frequencies is calculated by adopting a Person-III type probability model, the relation between the rainfall frequency and the rainfall intensity and the process under the typical reappearance period condition are analyzed, a storm risk distribution diagram is obtained, the 'point' domain flood disaster risk characterization is combined to be the surface flooding water depth runoff depth under the typical reappearance period condition, the conversion from the typhoon storm to the surface water depth considers evaporation and infiltration vegetation factors, the type of an underlying surface and topographic factors, and the runoff coefficient, the surface water penetration area and the gradient are respectively quantified, constructing an empirical function of the surface runoff of the research area, and performing regression analysis and fitting by using SPSS (Spsatellite dispersed sheet) to obtain the distribution condition of the runoff coefficient of the research area; the method comprises the following steps that a 'face' domain disaster risk analysis comprises the steps that a 'face' scale pointer carries out space distribution on typhoon rainstorm and flood risk, basic thought geography statistical analysis and space grid operation are carried out, and the space distribution condition of rainfall in the typhoon rainstorm process under the typical reappearance period condition is obtained by combining an inverse distance weighting method and a kriging method in a space interpolation module through a typhoon rainstorm risk space distribution method; the basic method for spatial distribution of flood submerging water depth comprises the steps of respectively obtaining rainfall distribution in typhoon and rainstorm days, percentage distribution of surface water permeable area and a grid map of terrain gradient distribution in a research area by using a spatial grid operation module, carrying out weighted assignment according to a land utilization type distribution map of the research area by referring to a land utilization planning map of the research area, carrying out spatial operation, and obtaining the distribution condition of typhoon and rainstorm-flood disaster risk under a typical reappearance period condition.

3. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the vulnerability analysis of flood disaster-bearing bodies comprises the following steps of acquiring information records of casualties and economic losses caused by historical disasters as basic data and integrating the information records; by considering the type, the distinguishable degree and the data acquirability of the flood bearing body, the types of the flood bearing body are mainly divided into four types according to the land utilization type, namely agricultural land, garden land, forest land and unused land; determining the flood damage rate of the disaster-bearing body by a frequency-disaster damage degree and risk analysis method, performing disaster damage rate-disaster intensity relation analysis by correlation analysis and regression analysis, counting the expression of the frequency, the frequency and the accumulated frequency to the vulnerability of the disaster-bearing body based on the loss grade, performing correlation analysis on the damage condition of the disaster-bearing body caused by historical disasters according to the disaster intensity and the damage degree of the corresponding disaster-bearing body, performing regression analysis under the condition of obvious correlation, and fitting a disaster damage degree function of a single disaster-bearing body under different disaster intensities; the flood disaster-bearing body vulnerability analysis also comprises the vulnerability distribution condition analysis of the flood disaster-bearing body, the flood disaster-bearing body is classified according to the land utilization types, a regional land utilization type graph is obtained through vectorization, different types of land space distribution graphs are extracted in a classified mode, flood submerging depth graphs of different land types are extracted based on grid multiplication operation, the disaster damage rate-flood submerging depth curve function of different land types is calculated based on historical disaster statistical data, the disaster damage rates of different land types are calculated based on space grid function operation, different numbers of grid units of the disaster damage rate are extracted from the different land type disaster damage rate space distribution graphs based on grid addition operation, the disaster damage rate distribution area is calculated, the disaster damage rate is classified appropriately, and the disaster damage rate grade vulnerability space distribution graph of the flood disaster-bearing body is obtained based on grid reclassification.

4. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the disaster damage probability distribution is used for calculating the disaster risk, namely the damage possibly brought by the occurrence of certain intensity disaster in a certain future time period in a certain area and the occurrence probability of the condition; based on the basic principle of mathematical Probability statistics, the frequency and Probability functional relationship of events is obtained, and the functional relationship of Probability and Annual Excess Probability (AEP) in a Probability mathematical model is as follows:

P＝1-(1-AEP)t

AEP＝F＝1/Ri

wherein, P is probability, AEP is annual transcendence probability, F is cycle, Ri is time period, and under the condition of low precision requirement, the annual transcendence probability is equal to the frequency in value and equal to the reciprocal of regression cycle, and the disaster loss probability is calculated by disaster intensity frequency.

5. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the disaster risk scenario characterization takes into consideration the disaster scenario risks of the time conditions, wherein the disaster risks of the same recurrence period refer to the risks of annual losses in the same time period, the same time period is understood as the risk that two element losses and the probability of the risk are changed in the future year, the disaster risks in the same area have no difference, and the disaster risks in different areas have spatial difference, and are numerically equal to the losses caused by annual disasters, and the loss values and the spatial distribution conditions thereof, namely the disaster risk values and the spatial differences, are calculated through disaster risk analysis, disaster-bearing body vulnerability analysis and disaster loss analysis; (2) risks of disaster losses in the same recurrence period are all X years, different time periods indicate that probability factors change, the frequency of occurrence of disasters with the same intensity gradually increases along with the lapse of the time periods, the disaster risks are understood as probabilities in time and are losses in space, the disaster risks in the same area gradually increase along with the time, the disaster risks in different areas mainly are loss differences, and the disaster risks can be represented by the probabilities in numerical terms, wherein the unit is; (3) risks of disaster losses in different recurrence periods in the same time period are different, occurrence probabilities are different due to different intensity disaster losses in different recurrence periods in the same time period in the next year, and different intensity disaster risks in the same area are different; the disaster risk comprehensively considers disaster loss and occurrence probability, and is calculated by a standard risk formula, wherein the formula is as follows:

Risk＝C*P

where C is the outcome of the event, in this study the loss of the disaster, and P is the probability of occurrence.

6. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 5, wherein: under the condition of a given research area and time span, the disaster risk of the standard risk formula depends on the occurrence probability of the maximum loss (namely the disaster consequence, the same as C in the standard risk formula); that is, when R is a region, T is a time interval, and H is a disaster event, the disaster risk conceptual function R is simplified to f (R, T, H, I, P) as follows:

R＝L*P

wherein R is disaster risk, L is loss caused by disaster, and P is occurrence probability as standard disaster risk function; the method comprises the steps of carrying out spatial distribution display on risks of disasters with different intensities in the same time period, carrying out spatial multiplication operation on the disasters with different intensities and the probabilities in a given time period, and grading operation results so as to compare disaster risk differences of the same and different areas.

7. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the disaster risk classification carries out grading on the comprehensive disaster risk level loss and probability, and converts the risk evaluation result from quantitative analysis into qualitative evaluation; the disaster risk mapping set compiling comprises disaster risk zoning, wherein the disaster risk zoning is classified according to the disaster risk, and the risk level areas at the same level are merged to express the space distribution conditions of different disaster risk levels; the disaster risk scenario definition is a basic condition for disaster risk expression, and comprises a space-time scenario, a natural disaster scenario, an artificial scenario condition and a combination condition thereof; the space-time scenes comprise time span, space scale and reappearance period, the natural scenes comprise various disaster typhoons, rainstorms, floods and ground subsidence, and the artificial scenes comprise artificial activities such as population economy, land utilization change, underground water mining and the like; obtaining disaster scenario risk analysis based on disaster risk scenario definition, wherein the disaster scenario risk analysis comprises two parts, namely risk scenario definition and scenario risk expression, the risk scenario definition refers to basic conditions of disaster risk expression, including space-time scenarios, natural disaster type scenarios, artificial scenario conditions and combination conditions thereof, and the scenario risk expression refers to characterization and spatial distribution of disaster risks under typical scenario conditions; the situation risk characterization is divided into four steps, namely risk analysis, vulnerability analysis, disaster damage analysis and risk grade distribution.

8. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 1, wherein: the early warning information platform adopts GIS platform secondary development, constructs the system main body based on API for JavaScript technology, and carries out risk assessment model display by analyzing historical typhoon rainstorm-flood information and real-time typhoon.

9. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 2, wherein: the single monitoring point that "point" domain calamity danger analysis was aimed at is including setting up at the monitoring early warning system based on under the complicated typhoon weather environment, and this monitoring early warning system includes support, solar energy power supply system, battery, GPRS/GSM communication module, control chip and meteorological sensor group, its characterized in that: the bracket comprises a base fixed with the ground and an upright rod hinged with the base, the base is provided with a first rotating motor in linkage fit with the upright rod, and the first rotating motor drives the upright rod to rotate from 0-90 degrees around a hinged point; the monitoring and early warning device further comprises a protection mechanism, the protection mechanism comprises a folding cover for covering the support and a second rotating motor, the folding cover comprises an outer membrane, a fixed framework and a movable framework, the fixed framework is fixed with the ground and is in hinge fit with the movable framework, the fixed framework and the movable framework are respectively and fixedly connected with two end parts of the outer membrane, the second rotating motor is in linkage fit with the movable framework and drives the movable framework to rotate around a hinge joint from 0 degree to 180 degrees, and the first rotating motor and the second rotating motor are in signal connection with the control chip; the protection mechanism further comprises a plurality of air bags and an inflator pump, the air bags are arranged between the outer membrane and the support and fixedly connected with the outer membrane, and the inflator pump is communicated with the air bags and is in signal connection with the control chip; still be equipped with a plurality of support frameworks between adventitia relatively immobile skeleton, the activity skeleton, this support framework and adventitia fixed connection to articulated with the pin joint of activity skeleton.

10. The comprehensive assessment method and early warning information platform for flood disaster risks in complex typhoon meteorological environment according to claim 9, wherein: the base is provided with an anchor which is inserted into the ground; the meteorological sensor group comprises a rain gauge, a wind speed measuring instrument and a temperature and humidity sensor; the solar power supply system comprises a solar panel and a charging controller.

Technical Field

The invention belongs to the technical field of typhoon disaster risk assessment, and particularly relates to a comprehensive assessment method for flood disaster risk in a complex typhoon meteorological environment and an early warning information platform.

Background

Typhoon is a strong tropical cyclone generated on the tropical ocean surface, China is one of the most seriously affected countries in the world by typhoon disasters, and serious casualties and economic losses can be caused by typhoon disasters in the coastal areas of the southeast of China all the year round; after the typhoon lands, the typhoon brings disastrous weather such as typhoon rainstorm, gale, storm surge and the like to coastal areas, and when the typhoon goes deep into inland or enters the sea again, the damage can be further caused. The conventional typhoon flood disaster risk assessment method generally analyzes the wind speed and the wind power of typhoons to achieve the early warning effect, but the regional areas of coastal cities have element situations of complex landforms and landforms, many small watersheds and many pond reservoirs, so that the areas are prone to flood disasters in the face of typhoons, and the conventional method cannot correspondingly assess the typhoon disasters according to different element situations. Therefore, the research and development of the comprehensive assessment method for the flood disaster risk in the complex typhoon meteorological environment and the early warning information platform which can provide helpful help for the defense of the typhoon flood disaster in different element situation areas become the technical problem which needs to be solved urgently.

Disclosure of Invention

The invention provides a comprehensive assessment method for flood disaster risks in a complex typhoon meteorological environment and an early warning information platform for solving the problems.

According to the technical scheme, the comprehensive assessment method for the flood disaster risk in the complex typhoon meteorological environment and the early warning information platform comprise a typhoon rainstorm-flood disaster risk analysis, a typhoon rainstorm-flood disaster risk evaluation and an early warning information platform; the typhoon rainstorm-flood disaster risk analysis is used for constructing a disaster-bearing body vulnerability degree curve by obtaining a disaster risk condition, and determining the maximum loss value generated by a future disaster-bearing body and the probability of occurrence in different time periods in the future, wherein the maximum loss value comprises typhoon rainstorm-flood risk analysis, flood disaster-bearing body vulnerability analysis, disaster loss probability distribution and disaster risk situation representation; the typhoon rainstorm-flood disaster risk evaluation makes a disaster risk time distribution table according to the result of risk analysis and obtains disaster influence area and disaster damage evaluation, including disaster risk classification, disaster risk atlas compilation and disaster risk scenario definition; and the early warning information platform displays the results of typhoon rainstorm-flood disaster risk analysis and evaluation.

After the method is adopted, analyzing by taking different element situations as objects according to natural disaster risk factors of a research area, including disaster risk analysis, vulnerability analysis of disaster-bearing bodies and disaster loss analysis, through typhoon rainstorm-flood disaster risk analysis and typhoon rainstorm-flood disaster risk evaluation, obtaining a disaster cause analysis result, and meanwhile, evaluating and obtaining a possible disaster damage and disaster response method by combining historical disaster details; by taking the natural disaster risk factors as objects to carry out analysis and evaluation, theoretical guidance and scientific basis can be provided for typhoon disaster defense work in different landform areas, and the typhoon disaster defense work can be displayed through an early warning information platform.

As a further improvement of the invention, the typhoon storm-flood risk analysis comprises acquiring a data source from an intensity information record of historical disaster occurrence, analyzing disaster risk from two scale systems of 'point' and 'surface', and estimating the intensity condition of the disaster occurring in a fixed period of time in the future; the point scale system and the surface scale system comprise point domain disaster risk analysis and surface domain disaster risk analysis; the 'point' domain disaster risk analysis aims at a single monitoring point, the process rainfall amount value under the typical reappearance period condition is established based on the typhoon storm disaster risk characterization, the maximum annual typhoon process rainfall of the monitoring station is generally a daily rainfall time sequence by adopting the 'hydrological frequency analysis' thought in the hydrology, the rainfall intensity value of the typhoon storm rainfall at the monitoring point under different frequencies is calculated by adopting a Person-III type probability model, the relation between the rainfall frequency and the rainfall intensity and the process under the typical reappearance period condition are analyzed, a storm risk distribution diagram is obtained, the 'point' domain flood disaster risk characterization is combined to be the surface flooding water depth runoff depth under the typical reappearance period condition, the conversion from the typhoon storm to the surface water depth considers evaporation and infiltration vegetation factors, the type of an underlying surface and topographic factors, and the runoff coefficient, the surface water penetration area and the gradient are respectively quantified, constructing an empirical function of the surface runoff of the research area, and performing regression analysis and fitting by using SPSS (Spsatellite dispersed sheet) to obtain the distribution condition of the runoff coefficient of the research area; the method comprises the following steps that a 'face' domain disaster risk analysis comprises the steps that a 'face' scale pointer carries out space distribution on typhoon rainstorm and flood risk, basic thought geography statistical analysis and space grid operation are carried out, and the space distribution condition of rainfall in the typhoon rainstorm process under the typical reappearance period condition is obtained by combining an inverse distance weighting method and a kriging method in a space interpolation module through a typhoon rainstorm risk space distribution method; the basic method for spatial distribution of flood submerging water depth comprises the steps of respectively obtaining rainfall distribution in typhoon and rainstorm days, percentage distribution of surface water permeable area and a grid map of terrain gradient distribution in a research area by using a spatial grid operation module, carrying out weighted assignment according to a land utilization type distribution map of the research area by referring to a land utilization planning map of the research area, carrying out spatial operation, and obtaining the distribution condition of typhoon and rainstorm-flood disaster risk under a typical reappearance period condition.

After the method is adopted, the typhoon disaster prevention work guidance can be carried out through typhoon rainstorm-flood risk analysis and the disaster risk can be analyzed from a point scale system and a surface scale system, the typhoon disaster prevention work guidance can be carried out through the surface domain disaster risk analysis, the area with high flood disaster risk can be found out, the integral anti-typhoon disaster prevention capability of the area can be enhanced, the main disaster cause of the monitoring point with high risk can be found out through the point domain disaster risk analysis, and the key disaster prevention capability can be enhanced.

As a further improvement of the invention, the vulnerability analysis of flood and disaster-bearing bodies comprises the following steps of acquiring information records of casualties and economic losses caused by historical disasters as basic data and integrating the information records; by considering the type, the distinguishable degree and the data acquirability of the flood bearing body, the types of the flood bearing body are mainly divided into four types according to the land utilization type, namely agricultural land, garden land, forest land and unused land; determining the flood damage rate of the disaster-bearing body by a frequency-disaster damage degree and risk analysis method, performing disaster damage rate-disaster intensity relation analysis by correlation analysis and regression analysis, counting the expression of the frequency, the frequency and the accumulated frequency to the vulnerability of the disaster-bearing body based on the loss grade, performing correlation analysis on the damage condition of the disaster-bearing body caused by historical disasters according to the disaster intensity and the damage degree of the corresponding disaster-bearing body, performing regression analysis under the condition of obvious correlation, and fitting a disaster damage degree function of a single disaster-bearing body under different disaster intensities; the flood disaster-bearing body vulnerability analysis also comprises the vulnerability distribution condition analysis of the flood disaster-bearing body, the flood disaster-bearing body is classified according to the land utilization types, a regional land utilization type graph is obtained through vectorization, different types of land space distribution graphs are extracted in a classified mode, flood submerging depth graphs of different land types are extracted based on grid multiplication operation, the disaster damage rate-flood submerging depth curve function of different land types is calculated based on historical disaster statistical data, the disaster damage rates of different land types are calculated based on space grid function operation, different numbers of grid units of the disaster damage rate are extracted from the different land type disaster damage rate space distribution graphs based on grid addition operation, the disaster damage rate distribution area is calculated, the disaster damage rate is classified appropriately, and the disaster damage rate grade vulnerability space distribution graph of the flood disaster-bearing body is obtained based on grid reclassification.

After the method is adopted, by analyzing disaster-bearing bodies of different land types and combining the historical disaster damage degree, a mathematical model curve is established to obtain a vulnerability spatial distribution map of the disaster damage rate grade of the disaster-bearing bodies; the method is used for establishing the vulnerability spatial distribution map of the disaster-tolerant body disaster damage rate level, and can protect the vulnerable area in advance in the face of typhoon disasters, so that the loss to be suffered is reduced.

As a further improvement of the present invention, the disaster damage probability distribution is obtained by calculating the disaster risk as the damage that may be caused by the occurrence of a certain intensity disaster in a certain area within a certain period of time in the future and the probability of the occurrence of the certain intensity disaster; based on the basic principle of mathematical Probability statistics, the frequency and Probability functional relationship of events is obtained, and the functional relationship of Probability and Annual Excess Probability (AEP) in a Probability mathematical model is as follows:

P＝1-(1-AEP)t

AEP＝F＝1/Ri

wherein, P is probability, AEP is annual transcendence probability, F is cycle, Ri is time period, and under the condition of low precision requirement, the annual transcendence probability is equal to the frequency in value and equal to the reciprocal of regression cycle, and the disaster loss probability is calculated by disaster intensity frequency.

After the method is adopted, on the basis of determining the easily damaged area, the damage caused by the flood disaster can be more scientifically avoided by calculating the probability of the disaster loss and adjusting the protection scheme according to the calculation result.

As a further improvement of the present invention, the disaster scenario characterization may take into consideration the disaster scenario risks of the time condition, including three cases, (1) risks of disaster losses in the same recurrence period in the same time period, where the same recurrence period refers to annual losses, and the same time period is understood as the risk that in the next year, both the two element losses and the probability of the risk change, and the disaster risks in the same area do not differ, and there is a spatial difference between the disaster risks in different areas, and the disaster risks are numerically equal to the losses caused by annual disasters, and the loss values and spatial distribution conditions thereof, i.e., the disaster risk values and spatial differences, calculated through the disaster risk analysis, the disaster-bearing vulnerability analysis and the disaster loss analysis; (2) risks of disaster losses in the same recurrence period are all X years, different time periods indicate that probability factors change, the frequency of occurrence of disasters with the same intensity gradually increases along with the lapse of the time periods, the disaster risks are understood as probabilities in time and are losses in space, the disaster risks in the same area gradually increase along with the time, the disaster risks in different areas mainly are loss differences, and the disaster risks can be represented by the probabilities in numerical terms, wherein the unit is; (3) risks of disaster losses in different recurrence periods in the same time period are different, occurrence probabilities are different due to different intensity disaster losses in different recurrence periods in the same time period in the next year, and different intensity disaster risks in the same area are different; the disaster risk comprehensively considers disaster loss and occurrence probability, and is calculated by a standard risk formula, wherein the formula is as follows:

Risk＝C*P

where C is the outcome of the event, in this study the loss of the disaster, and P is the probability of occurrence.

After the method is adopted, the risk of the disaster damage in the same recurrence period in the same time period is analyzed, so that the disaster risk values of typhoon conventional influences in different areas are obtained; by analyzing risks of disaster losses in the same recurrence period in different time periods, different probabilities of different typhoon disasters occurring along with the time lapse are obtained, and early warning is carried out aiming at the increase of the probabilities; the specific loss caused by typhoon disasters is obtained by analyzing the risks of disaster losses in different reappearance periods in the same time period.

As a further improvement of the present invention, under the condition of a given research area and time span, the standard risk formula has a disaster risk that depends on the occurrence probability of the maximum loss (i.e. the disaster consequence, as C in the standard risk formula); that is, when R is a region, T is a time interval, and H is a disaster event, the disaster risk conceptual function R is simplified to f (R, T, H, I, P) as follows:

R＝L*P

wherein R is disaster risk, L is loss caused by disaster, and P is occurrence probability as standard disaster risk function; the method comprises the steps of carrying out spatial distribution display on risks of disasters with different intensities in the same time period, carrying out spatial multiplication operation on the disasters with different intensities and the probabilities in a given time period, and grading operation results so as to compare disaster risk differences of the same and different areas.

After the method is adopted, the simplified disaster risk conceptual function is used for calculating, so that the risk difference of different areas facing the same disaster can be obtained, the key defense areas facing the same disaster can be judged, and the loss caused by the disaster can be reduced.

As a further improvement of the invention, the disaster risk classification carries out grading on the comprehensive of disaster risk level loss and probability, and converts the risk evaluation result from quantitative analysis into qualitative evaluation; the disaster risk mapping set compiling comprises disaster risk zoning, wherein the disaster risk zoning is classified according to the disaster risk, and the risk level areas at the same level are merged to express the space distribution conditions of different disaster risk levels; the disaster risk scenario definition is a basic condition for disaster risk expression, and comprises a space-time scenario, a natural disaster scenario, an artificial scenario condition and a combination condition thereof; the space-time scenes comprise time span, space scale and reappearance period, the natural scenes comprise various disaster typhoons, rainstorms, floods and ground subsidence, and the artificial scenes comprise artificial activities such as population economy, land utilization change, underground water mining and the like; obtaining disaster scenario risk analysis based on disaster risk scenario definition, wherein the disaster scenario risk analysis comprises two parts, namely risk scenario definition and scenario risk expression, the risk scenario definition refers to basic conditions of disaster risk expression, including space-time scenarios, natural disaster type scenarios, artificial scenario conditions and combination conditions thereof, and the scenario risk expression refers to characterization and spatial distribution of disaster risks under typical scenario conditions; the situation risk characterization is divided into four steps, namely risk analysis, vulnerability analysis, disaster damage analysis and risk grade distribution.

After the method is adopted, the risk evaluation result is converted from quantitative analysis to qualitative evaluation through disaster risk classification, and the emergency degree of the disaster can be better expressed through the disaster risk classification by considering the urgency and the practical significance of expression risk; compiling through a disaster risk atlas, summarizing basic results of disaster risk evaluation, and forming basic data for guiding regional disaster prevention and reduction planning; and by disaster risk scenario definition, different space-time scenarios, natural disaster scenarios and artificial scenario conditions are analyzed according to the actual situation combination of the research area to obtain corresponding disaster risk scenarios, and disaster risk expression is obtained according to the corresponding disaster risk scenarios.

As a further improvement of the invention, the early warning information platform adopts a GIS platform for secondary development, a system main body is constructed based on an API for JavaScript technology, and a risk assessment model is displayed by analyzing historical typhoon rainstorm-flood information and real-time typhoon.

After the method is adopted, the risk assessment model is displayed through the early warning information platform, and a basis is provided for government and related departments to make disaster-resistant decisions.

As a further improvement of the present invention, the single monitoring point for the "point" domain disaster risk analysis includes a monitoring and early warning system arranged in a complex typhoon-based weather environment, the monitoring and early warning system includes a bracket, a solar power supply system, a storage battery, a GPRS/GSM communication module, a control chip, and a meteorological sensor group, and is characterized in that: the bracket comprises a base fixed with the ground and an upright rod hinged with the base, the base is provided with a first rotating motor in linkage fit with the upright rod, and the first rotating motor drives the upright rod to rotate from 0-90 degrees around a hinged point; the monitoring and early warning device further comprises a protection mechanism, the protection mechanism comprises a folding cover for covering the support and a second rotating motor, the folding cover comprises an outer membrane, a fixed framework and a movable framework, the fixed framework is fixed with the ground and is in hinge fit with the movable framework, the fixed framework and the movable framework are respectively and fixedly connected with two end parts of the outer membrane, the second rotating motor is in linkage fit with the movable framework and drives the movable framework to rotate around a hinge joint from 0 degree to 180 degrees, and the first rotating motor and the second rotating motor are in signal connection with the control chip; the protection mechanism further comprises a plurality of air bags and an inflator pump, the air bags are arranged between the outer membrane and the support and fixedly connected with the outer membrane, and the inflator pump is communicated with the air bags and is in signal connection with the control chip; still be equipped with a plurality of support frameworks between adventitia relatively immobile skeleton, the activity skeleton, this support framework and adventitia fixed connection to articulated with the pin joint of activity skeleton.

After the method is adopted, in order to avoid plant shading, the solar panel and the meteorological sensor need to be arranged at a certain height and are both arranged on the vertical rod, but the vertical rod has the problem that the vertical rod is extremely dangerous when encountering typhoon weather. Therefore, the upright rod is connected with the base through the hinge, the upright rod is controlled by the first rotating motor, can rotate around the hinge point from 0 degree to 90 degrees, and is switched between a vertical state and a horizontal state; when the meteorological sensor group monitors that the weather is severe gradually, the vertical rod is controlled to drive all the devices to be laid flat, and the wind resistance and the impacted target are reduced. Simultaneously controlling a second rotating motor to drive the protection mechanism to be unfolded; the protection mechanism is assembled by an outer film, a fixed framework and a movable framework, the fixed framework is fixed with the ground, the second rotating motor drives the movable framework to rotate from 0-180 degrees to drive the outer film to be contracted to cover the whole support and extend, the two states are switched, and after the vertical rod is laid flat, the outer film covers the whole support along with the movable support to protect the support; after the outer film covers the bracket, the inflator pump inflates a plurality of air bags between the outer film and the bracket to form a buffer air bag, so that foreign matters caused by typhoons are prevented from impacting components; the air can be folded along with the outer membrane after being discharged; the supporting framework is unfolded along with the unfolding of the outer membrane, so that the supporting structure of the outer membrane is further reinforced.

As a further improvement of the invention, the base is provided with an anchor which is inserted into the ground; the meteorological sensor group comprises a rain gauge, a wind speed measuring instrument and a temperature and humidity sensor; the solar power supply system comprises a solar panel and a charging controller.

After the method is adopted, the weather sensor group for strengthening the stability of the base can be used for uploading collected information to the early warning platform by the GPRS/GSM communication module according to the arrangement of common weather monitoring sensors and is not limited to the listing.