Method for estimating flow by means of radar wave flow meter

Abstract

The invention provides a method for estimating flow rate by using a radar current measuring instrument, comprising the following steps: 1) measuring surface flow velocity; 2) calculating synthetic surface flow velocity; 3) calculating average flow velocity; 4) calculating flow rate. The present invention calculates the average flow velocity by establishing the corresponding functional relationship between the surface flow velocity and the average flow velocity, and does not use the Manning formula to calculate the average flow velocity. The present invention needs to measure less data when calculating the flow rate, avoids the inevitable error caused by the measurement to a certain extent, and reduces the cost and complexity required for calculating the flow rate. When the relationship between flow rate, more fitting functions can be used, which has good scalability.

Description

technical field [0001] The invention is a method for estimating the flow rate by using a radar current measuring instrument, which is mainly used for calculating the flow rate and can be widely used in various hydrological and water conservancy calculations. Background technique [0002] At present, the most widely used method for calculating discharge is to multiply the average flow velocity of the river by the average cross-sectional area of ​​the river, as shown in formula (1): [0003] Q=V*A (1) [0004] Among them: A is the average cross-sectional area of ​​the river channel, generally using the average value of multiple measured cross-sectional areas, in square meters (m2); V is the average flow velocity of the river, in meters per second (m / s), and the calculation of the average river velocity V is generally Using the Manning formula, as shown in formula (2): [0005] V = 1 n R ...

AI Technical Summary

Problems solved by technology

[0021] 2. Roughness error

[0023] 3. River slope error

[0025] 4. Sectional area error

[0028] (1) There are systematic errors: As analyzed above, since the four calculation parameters are more or less approximate calculations or inevitably introduce errors in the laboratory measurement process, there are systematic errors in the entire flow calculation process. At the same time, these Errors are intersecting and influencing each other, so the overall errors may partly cancel each other out, or they may accumulate together and be further amplified

[0029] (2) A lot of measurement data is required: when calculating the flow rate in this method, it is necessary to measure the average cross-sectional area of ​​the river, the average wetted area of ​​the cross-section (if the water depth h is used instead of the hydraulic radius R, it is not necessary to measure this value but the water surface width), roughness The measurement process of these four data is also relatively complicated, and the requirements for measurement are relatively high, so it brings some inconvenience to the calculation

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