Method for obtaining space distribution of drainage basin tension water volume and free water volume

Abstract

The invention discloses a method for obtaining space distribution of drainage basin tension water volume and free water volume. The method includes the first step of extracting drainage basin physical characteristics and obtaining drainage basin terrain indexes, soil types and space distribution of vegetation cover, the second step of determining space distribution of drainage basin aeration zone thickness and drainage basin humus soil thickness, and the third step of obtaining the space distribution of the drainage basin tension water volume and the free water volume. According to the method, drainage basin physical characteristics serve as a basis, variability of the tension water volume and the free water volume in space are considered, the space distribution of the drainage basin tension water volume and the free water volume is obtained from the perspective of parameter physical significance, and extraction steps are simplified through the digital basin technology; meanwhile, objective reasonability of results is guaranteed, and direct calling of distribution type hydrological models is facilitated.

Description

technical field [0001] The invention belongs to the technical field of hydrology, and specifically refers to a method for obtaining the spatial distribution of watershed tension water and free water capacity. Background technique [0002] With the development of technologies such as remote sensing, geographic information, and digital watershed, the distributed hydrological model based on the grid digital elevation model (DEM, Digital Elevation Model) has become an important Trends in watershed hydrological modeling. When modeling a distributed hydrological model, the main difficulty lies in how to obtain the spatial distribution of model parameters. In order to further promote the development of watershed hydrological models, more in-depth research is needed on the acquisition methods of the spatial distribution of parameters. [0003] Tensile water capacity and free water capacity are the two most critical parameters in domestic runoff calculation and water source divisio...

AI Technical Summary

Problems solved by technology

However, most of the current determination methods for the two parameters are subjective and empirical, and cannot objectively determine the parameters through the physical characteristics of the watershed from the perspective of the physical meaning of the parameters.

In addition, the current methods basically determine the parameters in a lumped manner, that is, assuming that the parameters are uniform in space, without considering the spatial variability of tension water and free water capacity, and cannot obtain a reasonable spatial distribution, thus limiting The application of these two parameters in distributed modeling is not conducive to the development of domestic distributed hydrological models

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