Hydrological model parameter calibration method based on multiple hydrological variables

Abstract

The invention relates to a hydrological model parameter calibration method based on multiple hydrological variables, and the method comprises the following steps: S1, obtaining long-time series hydrometeorological data, remote sensing inversion soil humidity and evaporation capacity data in a watershed range, and taking one year as a minimum unit, dividing the data period into a plurality of different sub-periods according to the conditions of annual precipitation, annual runoff and drainage basin underlying surface; s2, aiming at each sub-period, on the basis of remote sensing inversion evaporation capacity data and soil humidity index SWI data, calibrating hydrological model parameters in two modes of joint calibration and step-by-step calibration; and S3, by taking the King-Gupta efficiency coefficient as an evaluation index, analyzing and evaluating the flow process simulation effect of the model parameters in each rate stator sub-period and the flow process simulation effect of the model parameters transferred to other sub-periods. According to the method, the uncertainty of the model parameters can be effectively reduced, the mobility of the model parameters in different time periods is improved, and the reliability of the watershed hydrological model in production practice can be improved.

Description

technical field [0001] The application relates to a method for calibrating parameters of a hydrological model, in particular to a method for calibrating parameters of a hydrological model based on multiple hydrological variables, and belongs to the technical field of watershed hydrological models. Background technique [0002] The watershed hydrological model is a mathematical quantitative expression of the rainfall-runoff relationship in a watershed, and is an important research tool in the fields of hydrological forecasting, water resource utilization and management. Calibration of hydrological model parameters is crucial to the reliability of model forecast results. [0003] In the past half a century, influenced by climate change and human activities, the flow yield and confluence mechanism and rainfall-runoff relationship of many watersheds around the world have undergone significant changes. In order to more effectively simulate the rainfall-runoff relationship in cha...

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Problems solved by technology

[0004] However, the traditional hydrological model parameter calibration method is only based on the rainfall runoff data in the historical period of the watershed, resulting in high uncertainty of the parameters and poor transfer effect in different periods

On the one hand, the parameter calibration method based only on the flow process does not consider other hydrological intermediate variables, and the parameter combination obtained by calibration may not conform to the actual flow generation and confluence characteristics of the watershed; There are significant differences in the parameter values ​​determined in the historical period, and the corresponding flow simulation results are also quite different

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