Calculation Method of Watershed Natural Runoff Based on swat Model

Abstract

The invention discloses an SWAT (soil and water assessment tool)-model-based basin natural runoff calculation method. The SWAT-model-based basin natural runoff calculation method includes creating a basin SWAT model; determining parameter values of natural sub basins and verifying accuracy of the parameter values according to the SUFI-2 method; creating correlation between sub basin parameters and natural sub basin parameters; inputting the parameters, and calculating basin natural water resource according to the SWAT model. The SWAT-model-based basin natural runoff calculation method has the advantages that runoff information, capable of reflecting basin natural runoff conditions, of the natural sub basins is fully utilized, the correlation between the typical sub basin parameters and sub basin parameters with huge underlying surface changes is created, the parameters with low uncertainty are distributed to other areas, and accordingly, reliability of the natural runoff simulation value of the whole target basin is improved; a new method and a new thought are provided for calculation of natural runoffs.

Description

technical field [0001] The invention belongs to the field of natural runoff calculation, in particular to a watershed natural runoff calculation technology based on SWAT model. Background technique [0002] In recent years, with the development of economy and society and the acceleration of urbanization, the underlying surface of many watersheds has changed. Human activities such as industrial and agricultural water intake, domestic water intake, and groundwater exploitation have made the actual measured runoff unable to represent the natural runoff without the influence of human activities. Calculation of natural runoff in a basin is the basis for evaluating and allocating water resources in a basin. Only by understanding the real natural runoff in a basin can we talk about rational utilization. [0003] There are many methods to calculate natural runoff, one of which is to simulate natural runoff using a distributed hydrological model. The SWAT model is a distributed hyd...

AI Technical Summary

Problems solved by technology

[0004] At present, the use of the SWAT model to simulate natural runoff has the following shortcomings: (1) The efficiency of determining the parameter value of the model is low

The parameter value determination and sensitivity analysis functions of the SWAT model have low efficiency and long calculation time

(2) The uncertainty of the parameter value is large

Due to the difficulty of measuring natural runoff and the lack of corresponding historical hydrological data, there is great uncertainty in the parameter values ​​simulated by the model, which in turn leads to low simulation accuracy, and the simulated runoff still cannot represent natural runoff

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