Alluvial river resistance calculation and simulation method and device based on riverbed morphological parameters

Abstract

According to the method and device for calculating and simulating the alluvial river resistance based on the riverbed morphological parameters, the riverbed morphological parameters are determined according to the riverbed morphological characteristics of a natural alluvial river by considering the influence of riverbed fluctuation on the resistance, and the water flow parameters are determined in combination with the water level and flow data, so that the alluvial river resistance is efficiently and accurately calculated. The resistance calculation method comprises the steps that 1, riverbed morphological parameters are determined, specifically, the riverbed morphological parameters ks = ksp + kss + ksg are calculated by collecting, arranging and researching river section topography and bed sand grading data of a river reach over the years and combining water flow conditions, in the formula, ksp is the primary sand wave equivalent roughness height, kss is the secondary sand wave equivalent roughness height, and ksg is the sand grain equivalent roughness height; and step 2, based on ks determined in the step 1, adopting a resistance formula to calculate the resistance of different sections of the research river reach.

Description

technical field [0001] The invention belongs to the field of river resistance calculation, and in particular relates to an alluvial river resistance calculation and simulation method and device based on riverbed shape parameters. Background technique [0002] The change of river discharge capacity and flood level is closely related to the change of river resistance. The research of resistance has always been one of the difficult problems in the field of river research. It has been more than 100 years since Kennedy proposed the empirical relationship between the average flow velocity and water depth in a stable channel in 1895. The relationship between them, the discrimination of the shape of the bed surface and the calculation of the resistance of each unit have not yet been fully resolved. [0003] At present, through theoretical generalization or laboratory experiments, scholars at home and abroad have carried out a lot of research on the determination of river bed resist...

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Problems solved by technology

When the above formula is introduced into the calculation of the resistance of alluvial rivers, there are large errors, which cannot accurately reflect the equivalent roughness of the natural river bed surface, and are even difficult to apply directly, and cannot be used to accurately simulate river bed erosion and flood changes

One of the important reasons is that natural alluvial rivers are affected by geological conditions, and there are large fluctuations in the river channel topography. As a primary sand wave, its scale is much larger than that in the laboratory, and the existing resistance calculation methods often do not take this into account. Effect of primary sand wave on drag

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