A Generalization and Calculation Method for Compound Channel Sections Used in Distributed Hydrological Models

Abstract

The invention discloses a generalization and calculation method of a compound river section used for a distributed hydrological model, which comprises the following steps: adopting a plurality of inverted isosceles trapezoidal sections to fit the measured compound river section to obtain the values of the upper bottom width, the lower bottom width and the height of each trapezoidal section; According to the measured cross-sectional data, the curve of cross-sectional area and catchment confluence area is fitted, and the cross-sectional area of each sub-catchment is calculated by using the curveand the cross-sectional area of each sub-catchment. According to the ratio of simulated and measured cross-section area, the parameters of each sub-watershed cross-section are obtained by scaling andfitting the parameters of trapezoidal cross-section. The width-height ratio and area of each trapezoidal section and the accumulated depth and area of each trapezoidal section of each sub-watershed are calculated. The water depth of the cross-section can be obtained by knowing the cross-section area of the cross-section and the accumulated trapezoidal cross-section area. The water depth of the cross section and the accumulated trapezoidal cross section are known, and the area, wet circumference and hydraulic radius of the cross section can be obtained. The invention improves the generalization precision of the compound section; So as to improve the simulation accuracy of the model confluence process.

Description

technical field [0001] The invention relates to the field of hydrological models, in particular to a method for generalization and calculation of compound river section for distributed hydrological models. Background technique [0002] Distributed hydrological models are more and more widely used in the field of hydrological models; distributed hydrological models generally need to generalize the actual river cross-section, and use regular cross-sectional shapes (such as trapezoidal or triangular) to measure the relationship between flow, cross-sectional area and water depth. calculation. Compared with the measured section, the generalized section has the advantages of fewer parameters, simple calculation relationship between cross-section area and water depth, and can be analogized according to the confluence area of ​​different sub-basins. [0003] In general, the existing distributed hydrological models use a single shape (trapezoid or triangle) to generalize the cross-s...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing distributed hydrological models all use a single shape to generalize the cross-section of the river, which cannot completely fit the shape of the actual river cross-section, thereby reducing the calculation accuracy of the confluence process in the hydrological model

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