阅读说明：本技术 统一基准订正的河流流量全量程测量不确定度计算方法 (River flow full-range measurement uncertainty calculation method based on unified reference correction ) 是由 熊明 吴琼 朱子园 许全喜 于 2021-09-27 设计创作，主要内容包括：本发明提供了本发明提供了统一基准订正的河流流量全量程测量不确定度计算方法,包括全量程水位流量关系曲线及全量程水位流量关系曲线上包络线和全量程水位流量关系曲线下包络线的拟定、统一基准确定、实测流量同基准相对误差订正计算、流量标准差及总不确定度计算；应用本发明可避免因定位、水深、流速等测量仪器或方法的初始常误差对高、中、低水流量相对误差计算差异的影响；可为统一高、中、低水流量测验允许误差标准创造条件；可解决生态流量、水资源监测等中小流量测验误差评价的难题。(The invention provides a river flow full-range measurement uncertainty calculation method based on unified reference correction, which comprises the steps of drawing up an envelope curve of a full-range water level flow relation curve and an upper envelope curve of the full-range water level flow relation curve and a lower envelope curve of the full-range water level flow relation curve, determining a unified reference, correcting and calculating the relative error between an actually measured flow and the reference, and calculating a flow standard deviation and a total uncertainty; the method can avoid the influence of the initial common errors of the measuring instruments or methods such as positioning, water depth, flow velocity and the like on the calculation difference of the relative errors of the high, medium and low water flows; conditions can be created for unifying the allowable error standards of high, medium and low water flow tests; the method can solve the difficult problem of error evaluation of medium and small flow tests such as ecological flow and water resource monitoring.)

1. The river flow full-range measurement uncertainty calculation method with unified reference correction is characterized by comprising the following steps of:

s1, drawing up a full-range water level flow relation curve, an upper envelope curve of the full-range water level flow relation curve and a lower envelope curve of the full-range water level flow relation curve: drawing up a water level flow relation of the editing time period, drawing up an upper envelope line of the water level flow relation of the editing time period and drawing up a lower envelope line of the water level flow relation of the editing time period according to all actually measured water level and flow point data in the time period required to be edited;

s2, unified reference determination: selecting a median value or an average value of the maximum and minimum flow according to the measured water level and the flow point data distributionAnd the corresponding water level flow relation curve water levelMedian or mean value of maximum and minimum water levelsAnd the corresponding water level flow relation curve flowAs a reference point, and look up and readCorresponding upper envelope value、Corresponding lower envelope value；

S3, correcting and calculating the measured flow and the reference relative error: first, theMeasured flow pointThe relative error calculation according to the proposed unified reference correction formula:

wherein the content of the first and second substances,is as followsEach measured flow point;is as followsCorresponding water level of each measured flow pointInterpolation on the relation of water level and flow;first, theCorresponding water level of each measured flow pointInterpolation of the envelope curve under the water level flow;first, theCorresponding water level of each measured flow pointInterpolation of an envelope line on the water level flow;

s4, calculating the standard deviation of the flow and the total uncertainty: calculating the standard deviation of the full-range flow measurement point according to the relative error of the unified reference correction calculated by all the measured flow pointsAnd is composed ofCalculating the total random uncertainty of various confidence levels, and using the total random uncertainty for the total evaluation of the flow testing precision; wherein the content of the first and second substances,the number of the adopted measured flow points.

2. The method of claim 1, wherein the method comprises the steps of: the flat time period may comprise a year, a month, or a given fixed time period.

3. The method of claim 1, wherein the method comprises the steps of: the water level flow relationship comprises a stable water level flow relationship, a temporary curve or a single line of single-valued processing.

4. The method of claim 1, wherein the method comprises the steps of: the water level flow relation is drawn up by adopting an optimization method based on least square or minimum absolute value principle, wherein the optimization method comprises a target estimation line fitting method.

5. The method of claim 1, wherein the method comprises the steps of: the upper envelope curve for drawing up the water level flow relation of the whole time period and the lower envelope curve for drawing up the water level flow relation of the whole time period refer to straight lines or curves which are positioned above all water level or flow actual measurement point data and below the water level or flow actual measurement point data, and are determined by adopting a visual estimation line fitting method or a 90% random uncertainty of a flow independent component confidence level.

6. The method of claim 1, wherein the method comprises the steps of: the unified reference correction system is to convert all measured flow point data used for calculating relative errors into relative error values of a standard flow position in a unified manner.

7. The method of claim 1, wherein the method comprises the steps of: the full scale is meant to include all flow points and cover the highest and lowest water levels.

Technical Field

The invention relates to the technical field of hydrological measurement application, in particular to a river flow full-range measurement uncertainty calculation method based on unified reference correction.

Background

The river flow test precision of China is expressed by total uncertainty, the total uncertainty of various hydrological stations is calculated once per year according to high, medium and low water levels for precision evaluation, and the accuracy is compared with allowable errors of different water level levels to judge whether the requirements are met. Relative error of existing single flowAnd calculating, namely assuming that the actual measurement flow errors of all stages are the same normal distribution, and calculating the standard deviation of the measurement points and the total random uncertainty according to the normal distribution. The problems that initial errors have large influence on low-water relative error calculation and small influence on high water exist for a long time due to the fact that initial common error influences of measuring instruments such as origin distance, water depth and flow velocity are not considered, high, medium and low water unified flow test allowable errors cannot be made, and even if national standards such as river flow test regulations are adopted, the flow allowable errors of different water level levels have to be determined according to water level levels and data purposes or service objects.

How to eliminate or weaken the influence of various initial common errors when calculating the relative error of the actually measured flow, so that the calculation of all the flow errors of high, medium and low water keeps a uniform standard, and finally a uniform flow allowable error standard is formed, which is a problem to be solved urgently in the field of current hydrology test.

Disclosure of Invention

The invention aims to provide a river flow full-range measurement uncertainty calculation method with unified reference correction aiming at the defects of the prior art, and can solve the problem of error evaluation of medium and small flow tests in ecological flow and water resource monitoring.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a river flow full-range measurement uncertainty calculation method based on unified reference correction, which comprises the following steps of:

s1, drawing up a full-range water level flow relation curve, an upper envelope curve of the full-range water level flow relation curve and a lower envelope curve of the full-range water level flow relation curve: drawing up a water level flow relation of the editing time period, drawing up an upper envelope line of the water level flow relation of the editing time period and drawing up a lower envelope line of the water level flow relation of the editing time period according to all actually measured water level and flow point data in the time period required to be edited;

s2, unified reference determination: selecting a median value or an average value of the maximum and minimum flow according to the measured water level and the flow point data distributionAnd the corresponding water level flow relation curve water levelMedian or mean value of maximum and minimum water levelsAnd the corresponding water level flow relation curve flowAs a reference point, and look up and readCorresponding upper envelope value、Corresponding lower envelope value；

S3, correcting and calculating the measured flow and the reference relative error: first, theMeasured flow pointThe relative error calculation according to the proposed unified reference correction formula:

wherein the content of the first and second substances,is as followsEach measured flow point;is as followsCorresponding water level of each measured flow pointInterpolation on the relation of water level and flow;first, theCorresponding water level of each measured flow pointInterpolation of the envelope curve under the water level flow;first, theCorresponding water level of each measured flow pointInterpolation of an envelope line on the water level flow;

s4, calculating the standard deviation of the flow and the total uncertainty: calculating the standard deviation of the full-range flow measurement point according to the relative error of the unified reference correction calculated by all the measured flow pointsAnd is composed ofCalculating the total random uncertainty of various confidence levels, and using the total random uncertainty for the total evaluation of the flow testing precision;the number of the adopted measured flow points.

Further, the compilation time period comprises a year, a month, or a given fixed time period.

Further, the water level flow relationship includes a stable water level flow relationship, a temporary curve, or a single line of a single valued process.

Further, the water level and flow relation is drawn up by adopting an optimization method based on least square or minimum absolute value principle, including a mesh estimation line fitting method.

Further, the upper package route for drawing up the water level flow relationship of the whole time period and the lower package route for drawing up the water level flow relationship of the whole time period refer to straight lines or curves positioned above all the water level and flow actual measurement point data and below the position and flow actual measurement point data, and are determined by adopting an estimated adaptive line method and a 90% random uncertainty of a flow independent component confidence level.

Further, the unified reference correction means that all measured flow point data used for calculating the relative error are converted into the relative error value of a certain standard flow position in a unified manner.

Further, the full scale is meant to include all flow measurement points and cover the highest and lowest water levels.

The invention has the beneficial effects that: the influence of initial common errors of measuring instruments or methods such as positioning, water depth, flow velocity and the like on the calculation difference of relative errors of high, medium and low water flows can be avoided; conditions can be created for unifying the allowable error standards of high, medium and low water flow tests; the method can solve the difficult problem of error evaluation of medium and small flow tests such as ecological flow and water resource monitoring.

Drawings

FIG. 1 is a schematic diagram of a river discharge full-scale measurement uncertainty calculation method with unified reference correction according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a method for calculating uncertainty in river flow full-scale measurement by unified reference correction is characterized by comprising the following steps:

s1, drawing up a full-range water level flow relation curve, an upper envelope curve of the full-range water level flow relation curve and a lower envelope curve of the full-range water level flow relation curve: drawing up a water level flow relation of the editing time period, drawing up an upper envelope line of the water level flow relation of the editing time period and drawing up a lower envelope line of the water level flow relation of the editing time period according to all actually measured water level and flow point data in the time period required to be edited;

s2, unified reference determination: selecting a median value or an average value of the maximum and minimum flow according to the measured water level and the flow point data distributionAnd the corresponding water level flow relation curve water levelMedian or mean value of maximum and minimum water levelsAnd the corresponding water level flow relation curve flowAs a reference point, and look up and readCorresponding upper envelope value、Corresponding lower envelope value；

S3, correcting and calculating the measured flow and the reference relative error: first, theMeasured flow pointThe relative error calculation according to the proposed unified reference correction formula:

wherein the content of the first and second substances,is as followsEach measured flow point;is as followsCorresponding water level of each measured flow pointInterpolation on the relation of water level and flow;first, theCorresponding water level of each measured flow pointInterpolation of the envelope curve under the water level flow;first, theCorresponding water level of each measured flow pointInterpolation of an envelope line on the water level flow;

s4, calculating the standard deviation of the flow and the total uncertainty: calculating the standard deviation of the full-range flow measurement point according to the relative error of the unified reference correction calculated by all the measured flow pointsAnd is composed ofCalculating the total random uncertainty of various confidence levels, and using the total random uncertainty for the total evaluation of the flow testing precision;the number of the adopted measured flow points.

The flat time period may comprise a year, a month, or a given fixed time period.

The water level flow relationship comprises a stable water level flow relationship, a temporary curve or a single line of single-valued processing.

The water level flow relation is drawn up by adopting an optimization method based on least square or minimum absolute value principle, wherein the optimization method comprises a target estimation line fitting method.

The upper package route for drawing up the water level flow relation of the whole time period and the lower package route for drawing up the water level flow relation of the whole time period refer to straight lines or curves positioned above all water level or flow actual measurement point data and below the water level or flow actual measurement point data, and are determined by adopting an estimated line fitting method or a 90% random uncertainty of a flow independent component confidence level.

The unified reference correction system is to convert all measured flow point data used for calculating relative errors into relative error values of a standard flow position in a unified manner.

The full scale is meant to include all flow points and cover the highest and lowest water levels.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.