Uncertainty Calculation Method for Full-scale Measurement of River Flow Based on Unified Datum Correction

Abstract

The present invention provides a method for calculating the uncertainty of river flow full-scale measurement with unified reference correction, including the full-scale water level and flow relationship curve, the upper envelope of the full-scale water level and flow relationship curve, and the lower envelope of the full-scale water level and flow relationship curve. The drawing up of the network line, the determination of the unified benchmark, the correction calculation of the relative error between the measured flow and the benchmark, the calculation of the standard deviation of the flow and the calculation of the total uncertainty; the application of the present invention can avoid the initial constant error due to the positioning, water depth, flow velocity and other measuring instruments or methods. It can create conditions for unifying the allowable error standards of high, medium and low water flow tests; it can solve the difficult problem of error evaluation of small and medium flow tests such as ecological flow and water resource monitoring.

Description

technical field [0001] The invention relates to the technical field of hydrological measurement applications, in particular to a method for calculating the uncertainty of river flow full-range measurement with unified reference correction. Background technique [0002] The measurement accuracy of river flow in our country is expressed by the total uncertainty. Various hydrological stations calculate the total uncertainty once a year according to high, medium and low water levels for accuracy assessment, and compare it with the allowable error of different water level levels to judge whether it meets the requirements. The relative error of the existing single flow according to Calculation, which assumes that the measured flow errors at all levels are the same normal distribution, and calculates the standard deviation of the measuring point and the total random uncertainty accordingly. Since the influence of the initial errors of measuring instruments such as starting point ...

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Problems solved by technology

Since the influence of the initial errors of measuring instruments such as starting point distance, water depth, and flow velocity is not considered, the problem that such initial errors have a greater impact on the calculation of the relative error of low water and less impact on high water has existed for a long time, and it is impossible to formulate high, medium, and low The allowable error of the unified flow test of water, even the national standards such as "River Flow Test Specifications", has to determine the allowable error of flow at different water level levels according to the water level level and the purpose of the data or the service object

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