River hydrological landform change key factor contribution degree analysis method and system

Abstract

The invention discloses a river hydrological landform change key factor contribution degree analysis method and system, and the method comprises the steps: determining the total riverbed erosion and deposition amount delta S of a research reach according to the river topographic data obtained through two times of actual measurement; determining the input sediment amount Sq of the branch of the research river section and the natural erosion and deposition replenishment sediment amount S1 of the main stream riverbed; S2, determining the contribution degree of each factor for driving the riverbeddeformation of the research reach, selecting the guarantee rate P of dry water level and flow analysis, and determining the influence value and the contribution degree of each factor for driving thedry water level to change. Based on a sediment total conservation principle, the research reach is used as a whole. River topography, hydrological sediment of an adjacent hydrological station, seriesannual characteristic flow of the hydrological station, characteristic water level change, water level flow relation and the like are measured in a research time period; the contribution degree of key factors such as flow, sand mining and natural silt washing for driving the dry water level change is determined, and a new scheme is provided for analyzing the contribution degree of the key factorsof river hydrological and geomorphic change.

Description

technical field [0001] The invention belongs to the field of waterways and water conservancy projects, and in particular relates to a method and system for analyzing the contribution degree of key factors in river hydrology and landform changes. Background technique [0002] With the impact of the operation of cascade reservoirs, the implementation of water and soil conservation projects, and sand mining in rivers, rivers in my country have generally experienced new changes in river hydrology and landforms in recent years, characterized by a sharp decrease in sand, a sharp incision of the river bed, and a significant drop in dry water levels. The incision of the river bed and the drop of the dry water level are related to the safety of river water ecology and navigation, especially in the downstream reaches of the final hub of some rivers, which are significantly affected by the change of river water and sediment but have weak regulation and storage capacity, such as the Shui...

AI Technical Summary

Problems solved by technology

For alluvial rivers, there are many factors that affect the change of river hydrology and geomorphology such as river bed topography and dry water level, but it is generally believed that changes in river water and sediment conditions, sand mining activities, and river channel improvement projects are the key factors. Since these factors are often superimposed on each other, Increased the difficulty of understanding. Due to the lack of systematic research methods, the existing research on riverbed deformation and dry water level changes is mainly based on qualitative analysis, and the influence value and contribution of key factors cannot be given, which is not conducive to a deep understanding of the dynamics of river topography and hydrological changes. and law

Images