Temperature-dominated variable source runoff production mode simulation method for permafrost region

Abstract

The invention provides a temperature-dominated variable source runoff production mode simulation method for a permafrost region. The method comprises the following steps: extracting a hydrological response unit (HRU) of a research region; determining a research time period in which variable source runoff production mode simulation needs to be performed; obtaining basic geographic information of the research region and basic meteorological data of the research region in a research time period; and simulating the runoff production process of the research region in the research time period. The invention has the advantages that input parameters of the temperature variable source runoff production model are few, only air temperature and rainfall data are included, surface temperature and soilmoisture data are obtained through calculation of modules in the model, and the invention is suitable for frozen soil regions, especially frozen soil regions lacking data; 2) the model is simple and convenient, complex numerical calculation is not involved, and the calculation speed is high; 3) a temperature variable source runoff production mechanism is provided for the model, and the simulationprecision of the slope runoff production and basin runoff formation process under freeze-thaw cycle control is improved; and 4) the model time step length setting is flexible and changeable, and the use is flexible and convenient.

Description

technical field [0001] The invention belongs to the technical fields of permafrost hydrology, watershed runoff and hydrological models, and in particular relates to a variable source runoff model simulation method dominated by temperature in permafrost regions. Background technique [0002] Glaciers, snow and permafrost are the three underlying surface elements of the hydrological process in cold regions. At present, the research methods of glacier meltwater runoff and snowmelt runoff are relatively mature, and permafrost is a widely distributed hydrological element in cold regions. Different from the water cycle and water conversion relationship in non-frozen regions, it is determined that permafrost regions have completely different runoff formation processes, mechanisms and seasonal dynamics. [0003] At present, the main problems of the hydrological process simulation methods in permafrost regions are as follows: (1) the simulation model has too many input parameters, an...

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Problems solved by technology

[0003] At present, the main problems of the hydrological process simulation methods in permafrost regions are as follows: (1) the simulation model has too many input parameters, and the calculation time is long; moreover, it has great application limitations in permafrost watersheds where data are lacking; (2) the existing When the permafrost simulation model performs hydrological process simulation, the flow-producing soil thickness parameter H is constant for each HRU, which leads to low accuracy of hydrological process simulation

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