Calculation method of dynamic water storage capacity and runoff during soil freezing and thawing

Abstract

The invention discloses a method for calculating dynamic water storage capacity runoff yield in soil freeze-thaw process, and belongs to a hydrological science category in geophysical science categories. The method comprises the following steps of: calculating frozen soil depths at different times in grids of a watershed according to soil temperature distribution; analyzing day-by-day spatial distribution conditions of the frozen soil depths so as to obtain field capacities, distributed along with time, of aeration zones in different grids of the watershed; finding out the maximum field capacities in different grids of the watershed, and calculating the maximum water-holding capacity of the watershed; and calculating a soil freeze-thaw runoff yield of the watershed according to the obtained maximum field capacities in different grids and the maximum water holding capacity of the watershed. According to the method disclosed by the invention, the day-by-day soil freeze / thaw, frozen soil depths and soil temperatures can be simulated according to observed air temperatures, and the day-by-day process of thaw / rainfall runoff can be calculated according to rainfall observation, so that the runoff simulation precision in soil thaw periods in spring is improved, scientific basis is provided for the spring flood prevention decisions, and the gap of frozen soil area runoff yield calculation in the existing home and aboard hydrological models is filled.

Description

technical field [0001] The invention relates to a new calculation method for flow generation of dynamic water storage capacity during the freezing and thawing process of watershed soil, and belongs to the technical field of hydrology branch under geophysics. Background technique [0002] Watershed runoff is the most important part of the water cycle, and runoff calculation methods are an important theoretical basis for watershed hydrological simulation, water resource calculation, and flood forecasting. In the 1930s, Horton proposed the concept of super-seepage runoff, that is, surface runoff is generated when the rainfall is stronger than the infiltration capacity. Runoff (including surface runoff, soil inflow and base flow) will be generated after the water storage capacity of the soil meets the water storage capacity. Since then, all hydrological models developed have used over-seepage or full storage as the theoretical method for runoff calculation. At different times, ...

AI Technical Summary

Problems solved by technology

There have been many experiments and theoretical studies on the problem of permafrost infiltration and runoff, but there is no experimental data on the infiltration intensity and permeation degree of permafrost that can be used in practice and meet runoff forecasts in cold regions.

Hydrological models (such as VIC model, SWAT model, Xin'anjiang model, etc.) Soil Yield Calculation Method

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