Watershed hydrological model design method based on storage capacity curve and TOPMODEL

Abstract

The invention provides a watershed hydrological model design method based on a storage capacity curve and a TOPMODEL, which comprises the following steps: calculating surface runoff yield; calculating subsurface runoff yield; calculating evapotranspiration; applying a water balance equation; establishing a convergence mechanism; generating isochrones; dynamically and visually expressing soil moisture; and coupling with a Noah land surface model (Noah LSM). The method has a high simulation deterministic coefficient, is advantageous over a semi-distributed model TOPMODEL, a Xinanjiang model and distributed hydrological models such as an engineering and science summer institute (ESSI) model, a hydrologic engineering center hydrologic modeling system (HEC-HMS) model and a soil and water assessment tool (SWAT) model in the simulation of a daily runoff process and the simulation of a flood process, and overcomes the drawback that the conventional watershed hydrological model is usually inapplicable to hydrological process accurate simulation under large-scale, arid and semiarid conditions. The model of the invention can be successfully coupled with Noah LSM and improves the rainfall, soil moisture and runoff broadcasting capacity of a service weather research forecast mode, namely global / regional assimiliation prediction system (GRAPES)-mesoscale(MESO).

Description

technical field [0001] The design method of the semi-distributed hydrological model of the present invention is more specifically the design method of the watershed hydrological model based on the water storage capacity curve and TOPMODEL. Background technique [0002] TOPMODEL is a terrain-based semi-distributed hydrological model proposed by Beven and Kirkby in 1979. Its main feature is to use the watershed terrain index (lnα / tanβ) as an index of hydrological similarity. points, have the same hydrological response to rainfall. As a result of this assumption, the topography of a watershed can be represented by the spatial distribution of topographic indices. Points with larger Topographic Index values ​​will be the first to saturate, thus implying areas of potential surface and subsurface runoff production. The change of runoff area caused by wet or dry watershed can be represented by the spatial distribution of topographic index. [0003] Topography is a very important ...

AI Technical Summary

Problems solved by technology

As a result, a series of problems arise: spatial differences in precipitation, underlying surface conditions, topography, etc. cannot be reflected in hydrological responses

Compared with the TOPMODEL and Xin'anjiang (or VIC) models, SWB has in common that it can describe the spatial heterogeneity of soil moisture with a statistical distribution function. The difference is that SWB cannot effectively express the change of runoff source area. Moreover, its parameterization scheme of flow generation and confluence is too simple to accurately describe the hydrological process of land surface and shallow surface.

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