A Parameter Calibration Method of Hydrological Model Based on Multiple Hydrological Variables

Abstract

This application relates to a hydrological model parameter calibration method based on multiple hydrological variables, including the following steps: S1, obtaining long-term hydrometeorological data within the watershed range, and remote sensing inversion of soil moisture and evaporation data, with 1 year as the minimum unit , the data period is divided into several different sub-periods according to the conditions of annual precipitation, annual runoff, and the underlying surface of the watershed; S2. For each sub-period, based on remote sensing retrieval evaporation data and soil moisture index SWI data, The parameters of the hydrological model are calibrated in two ways: joint calibration and step-by-step calibration; S3, taking the Kling-Gupta efficiency coefficient as the evaluation index, analyzing and evaluating the flow rate of the model parameters in each stator period and transferred to other sub-periods Process simulation effect. The invention can effectively reduce the uncertainty of model parameters, improve the transferability of model parameters in different time periods, and is beneficial to improve the reliability of watershed hydrological models in production practice.

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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