Solution method for channel stage-discharge relation model

Abstract

The invention provides a solution method for a channel stage-discharge relation model. The method is simple, quick and accurate in calculation and includes: step 1, repeatedly measuring three groups of water stage and discharge data under three steady flow states; step 2, on the basis of the three groups of water stage and discharge data under each steady flow state, adopting a weighted average method for solving water stage and discharge estimated values under corresponding steady flow state; step 2-1, calculating an average of the three groups of discharge and stage measurement values; step2-2, calculating a weight coefficient of a jth discharge and stage measurement value under an ith steady flow state; step 2-3, calculating discharge and stage estimated values under the ith steady flow state; step 3, on the basis of simulation of the biological evolution theory, solving a group of solutions to the stage-discharge relation model, and repeatedly solving to obtain N groups of model solutions; step 4, creating a state equation and a measurement equation of the model solutions; step 5, subjecting the N groups of model solutions to filter processing on the basis of a kalman filtering algorithm to obtain an optimal solution of the model.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering and relates to a solution method for a channel water level flow relationship model. technical background [0002] The traditional water level and flow relationship calibration method obtains the functional relationship of water level and flow based on the measured water level and flow data, and compares the estimated value with the measured value. The closer the fitting curve is to the measured value, the higher the fitting accuracy. [0003] For weir flow, the commonly used flow calculation model is Q=ah b , where a and b are undetermined parameters. According to the measured water level and flow observation values, draw the H-Q curve, and directly use the least square method to fit the H-Q curve to obtain the corresponding parameters a and b. In view of the static water level in the channels of some irrigation areas, the weir flow model is defined as Q=a(h-c) b , where th...

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Problems solved by technology

However, the acquisition of each set of water level and flow observations needs to keep the water flow relationship stable. The water flow relationship in the irrigation area is constantly changing. The transition process from a stable flow state to another stable flow state is slow, and the calibration time period is long. ; In some irrigation areas, the water diversion method is controlled by the water pump switch, and only a small number of flow observations at the water level can be obtained. It is difficult for the water level and flow observations to be evenly distributed within the entire water level (flow) range, and the generalization ability is low.

[0005] Therefore, it is objectively difficult to obtain enough water level and flow observation values, and it takes more time and labor costs. In order to solve these problems, it is necessary to find a flow measurement method that can ensure measurement accuracy and improve engineering practice. s efficiency

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