DEM water flow direction simulation method combining tangent plane curvature and Dinf method

Abstract

The invention provides a DEM water flow direction simulation method combining tangent plane curvature and a Dinf method, and belongs to the technical field of digital terrain analysis. According to the technical scheme, the method comprises the steps that S1, a DEM is loaded, grid units needing to calculate the water flow direction and eight adjacent units around the grid units are retrieved, thecenter points of the grid units are connected to divide eight triangular planes needed by the Dinf method, the Dinf flow direction is calculated, and the Dinf flow direction is set to be increased clockwise with the due north direction as 0 degree; s2, a triangular plane where the Dinf flow direction is located is determined, and section curvatures of vertex units in two downhill directions on theplane are calculated; and S3, the Dinf flow direction is corrected by using the tangent plane curvature. The method has the beneficial effects that the Dinf flow direction is rotated towards the convergent downhill direction, so that the obtained water flow direction is closer to the characteristic that the water flow direction converges towards valleys under the real condition.

Description

technical field [0001] The invention relates to the technical field of digital terrain analysis, in particular to a DEM water flow direction simulation method combined with a tangent surface curvature and a Dinf method. Background technique [0002] The water flow direction based on the DEM structure is widely used in hydrological forecasting, soil thickness evolution, pollutant migration and other research fields. However, there is no recognized best water flow direction simulation method, and the existing methods have more or less certain problems. This severely limits the accuracy of results for correlation studies based on flow direction. [0003] The early classic D8 method (O'Callaghan and Mark, 1984) only allowed water to flow in one of 8 feasible directions, which was seriously inconsistent with the flow of water in any direction from 0° to 360° in the real world, which led to a large error exist. Therefore, Tarboton proposed the Dinf method in 1997, which allows t...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the accuracy of the current direction obtained by the existing infinite flow direction method is not enough due to the undulation of the terrain, and the precise confluence cannot be achieved, and the finally obtained river network is not accurate enough. direction of water flow, and a DEM water flow direction simulation method combining tangent surface curvature and Dinf method is proposed

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