Method for predicting two-stage bifurcated river diversion ratio of plain river network

Abstract

The invention discloses a method for predicting a two-stage bifurcated river diversion ratio of a plain river network, and belongs to the technical field of calculation, reckoning or counting. The method comprises the following steps: collecting basic data of a target river reach and collecting split ratio data of field on-site observation; constructing a planar two-dimensional water flow mathematical model in the target river reach; adopting a planar two-dimensional water flow mathematical model to simulate the influence of main flow, roughness, branching angle, branching width and water level difference on the split ratio, and carrying out single-factor regression on each parameter to obtain a mathematical relationship between the split ratio and each parameter; performing multiple regression on the mathematical relationship between the split ratio and each parameter, obtaining a multi-parameter plain river network split ratio comprehensive prediction equation by combining ridge regression, and calculating the prediction equation by combining actual data of trunk flow, roughness, branching angle, branching width and water level difference so as to determine a split ratio prediction value, so that the split ratio can be predicted quickly.

Description

technical field [0001] The invention discloses a method for predicting the diversion ratio of two-stage branched river channels in a plain river network, in particular to a method for constructing a multi-parameter comprehensive prediction equation for the diversion ratio of a plain river network by combining single factor regression with multiple regression and ridge regression, which belongs to calculation, The technical field of reckoning or counting. Background technique [0002] Branched channel is a common river type in natural rivers. The diversion characteristics of branched rivers are traditionally represented by the diversion ratio, and its size and change will affect the rise and fall of each branch of the branched river, thereby changing the channel and determining the layout of flood control. Affected by urbanization, plain river network areas have gradually exposed problems such as damage to the structure of the water system, obstruction of river connectivity,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and provide a method for predicting the diversion ratio of two-stage branched rivers in the plain river network. The prediction equation established by comprehensively considering the factors affecting the diversion ratio can quickly and accurately predict the plain river network The diversion ratio of two-stage branched rivers solves the technical problem of large workload and time-consuming prediction of diversion ratio

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