Regional comprehensive drought identification method based on hydrological simulation

Abstract

The invention discloses a regional comprehensive drought identification method based on hydrological simulation, and belongs to the technical field of drought identification. The method comprises the following steps: collecting and processing long-series hydrometeorological observation data of a region, carrying out parameter calibration on a hydrological model to obtain the hydrological model, inputting rainfall and potential evapotranspiration data of a certain time period, and simulating to obtain soil water content and runoff volume of a corresponding time period so as to obtain meteorological, agricultural and hydrological drought index sequences in the region, so that regional comprehensive drought identification is carried out. The method disclosed by the invention can reveal the internal relation of occurrence and development of different types of drought by researching the progressive relation of regional meteorological drought, agricultural drought and hydrological drought in time, and has a relatively strong physical mechanism. In addition, drought situation prediction can be carried out by simulating regional soil water content and runoff through the hydrological model, and an evaluation and simulation platform is provided for drainage basin drought identification and drought early warning prediction.

Description

technical field [0001] The invention belongs to the technical field of drought identification, in particular to a regional comprehensive drought identification method based on hydrological simulation. Background technique [0002] Drought is an extremely complex natural phenomenon that usually begins with little rainfall, leading to water shortages that spread throughout the hydrological system, thereby further affecting soil moisture content, groundwater storage, river runoff, and reservoir storage. Droughts are generally divided into four categories according to their causes and their impact processes: meteorological droughts, agricultural droughts, hydrological droughts, and socioeconomic droughts. There is a time-progressive relationship among the four types of droughts. Studying the evolution process and basic laws of different types of drought will help improve regional drought early warning capabilities, rationally plan regional water resources, and provide scientifi...

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Problems solved by technology

Due to the many factors affecting regional drought, most studies only consider the impact of a single factor on drought, and only use a single index to evaluate a certain type of drought in the region, failing to consider the comprehensive regional drought under the joint influence of multiple factors, resulting in the evaluation of regional drought. one-sidedness

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