Measuring and calculating method for water conserving and storing capacity of drainage basin based on soil freeze-thawing

Abstract

The invention discloses a measuring and calculating method for water conserving and storing capacity of a drainage basin based on soil freeze-thawing. The method comprises the following steps: firstly, processing basic data; secondly, calculating the soil freeze-thawing hydrothermal state in the drainage basin, so as to obtain the proportion of ice content in the soil; then, quantitatively expressing the temporal distribution of the water conserving and storing capacity at various grid points in the drainage basin, and calculating the grid-type soil water conserving and storing capacity index; finally, calculating the water conserving and storing capacity at grid points in a sub-basin of each stage, drawing discretized cumulative distribution curves of the water conserving and storing capacity in all the sub-basins so as to obtain a dynamic measuring and calculating model of the water conserving and storing capacity of soil in the drainage basin of a freeze-thawed area, and measuring and calculating the water conserving and storing capacity of the drainage basin during the soil freeze-thawing. According to the invention, a numerical model is built for a point-scale melted snow-frozen soil hydro-thermal coupling system, and establishes relationship with the water conserving and storing capacity of soil in drainage basin grids, so that the water conserving and storing capacity index of the drainage basin at spatial scale is set dynamically to coincide with the actual situation, and errors caused by the homogenization of a cold region drainage basin are reduced.

Description

technical field [0001] The invention belongs to the technical field of water cycle of water conservancy projects, in particular to a method for measuring and calculating water storage capacity of watershed basins based on soil freezing and thawing processes. Background technique [0002] Global climate change, which affects natural systems, biological systems, and human society, has already occurred and will intensify. Any direction of it will have a non-negligible impact on natural ecosystems and social economies. Among the various environmental systems affected by climate, the alpine ecosystem is one of the most sensitive areas, and its activity process is profoundly affecting the entire earth system. The water cycle process in alpine regions has an extremely important impact on human economic and social activities. Floods, droughts and uneven distribution of water resources caused by water cycle activities have caused huge losses to the world. In order to be able to unde...

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Problems solved by technology

[0004] Although there are currently studies on the mechanism of freezing and thawing in cold regions, most of them focus on the description of the hydrothermal coupling process, and less attention is paid to the impact of freezing and thawing transformation on the hydrological process of the watershed, especially the runoff process.

There are studies on the impact of soil freeze-thaw activities on the water storage capacity of watershed soil, but the research results are mostly described by empirical curves. For example, the Xin'anjiang model proposes a parabolic water storage capacity curve, in which empirical The parameters need to be calibrated, and the theoretical degree of the model structure is not high

The water storage capacity of cold regions is closely related to the watershed climate and soil texture in essence, but there is no report on the combination of snowmelt-frozen soil water, heat coupling and soil type to jointly determine soil water storage capacity

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