Slope flow dynamic visualization method based on shortest confluence time

Abstract

The invention discloses a slope flow dynamic visualization method based on the shortest confluence time, and the method comprises the steps: 1, building a confluence cumulative diagram, carrying out the depression filling of an original digital elevation model of a drainage basin, obtaining a depression-free digital elevation model, and obtaining a drainage basin water flow direction diagram and the confluence cumulative diagram; carrying out rasterization on watershed water flow, and calculating a slope flow length value. 2, establishing a drainage basin calculation model; performing gradient analysis on the depression-free DEM to obtain a gradient value of each grid unit in the drainage basin; analyzing the drainage basin soil; rasterizing the drainage basin, and constructing a grid calculation model according to an SCS-CN model; setting a rainfall scene, and obtaining the runoff depth and the net rain intensity; e, distinguishing slope units and river channel units; f, calculating the slope flow confluence time; g, constructing a slope flow path; and H, inputting matrix data. and 3, carrying out visual simulation and dynamic visualization on the slope flow of the drainage basin by using the matrix data. According to the method provided by the invention, the slope flow visualization can be more accurate.

Description

technical field [0001] The invention relates to the field of hydrology, in particular to a dynamic visualization method for slope flow based on the shortest confluence time. Background technique [0002] Slope flow refers to the thin-layer water flow formed by rainfall or snowmelt and flows along the slope under the action of gravity. It is produced when the rainfall exceeds the soil infiltration and ground subsidence storage capacity. Slope flow is the initial stage of surface runoff and the most basic unit of soil erosion in a watershed. Slope water flow is affected by natural or artificial factors such as soil type, vegetation cover, land use type, rainfall characteristics, and flow channels. Its movement law and hydraulic characteristics are very complex and change with time and space. The visualization of slope flow dynamics can visually present the formation process of slope flow dynamics that change with time and space, which is convenient for people to observe and a...

AI Technical Summary

Problems solved by technology

[0003] There are currently two visualization methods related to slope flow that can be found in the literature. One is to use the 3D modeling and image rendering functions of computer graphics to represent the 3D hydrological process of the surface space. ——Taking the Huangtuling Watershed in Zhejiang Province as an Example”, this method is separated from the hydrological model calculation and the visualization of the hydrological process in the surface space, so that the impact of the accumulation of confluence on the surface runoff velocity cannot be accurately evaluated; the second is to use the vectorized surface runoff path Perform a dynamic visualization simulation of surface flow as described in the paper "The simulation of surfaceflow dynamics using a flow-path network model"

However, this method does not distinguish between channel units and slope units, and there is a certain error

Images