A Calculation Method for Critical Groundwater Depth of Soil Salinization

Abstract

The invention relates to a soil salinization critical groundwater depth calculation method. The method comprises the steps that a soil type is determined; soil texture is determined; a soil capillaryequivalent pore diameter is calculated; a temperature range is determined; surface tension of water is determined; a salinization critical value is determined; and critical depth is calculated. According to the method, by analyzing the principle that salt is brought to the surface under the action of groundwater capillaries, the soil salinization process is elaborated, and the critical depth causing soil salinization is defined; and a calculation function of a key parameter, namely the soil equivalent pore diameter, in a rise height theoretical formula of capillary water is derived, the maximum rise height of the capillary water is used as a calculation objective, and a salinization model is constructed to determine the soil salinization groundwater critical depth. The method is clear in physical process and action mechanism, has universality for solving the soil salinization problem caused by excessively high groundwater and provides reliable theoretical and technical support for guiding reasonable development and utilization of groundwater resources and governance of soil salinization.

Description

technical field [0001] The invention relates to a calculation method for soil salinization critical groundwater burial depth, is a calculation method for hydrology and water conservancy, and is a calculation method for environmental protection monitoring. Background technique [0002] Determining a reasonable water level for groundwater exploitation is of great significance for effectively promoting groundwater management, and it is also a technical difficulty that needs to be overcome urgently for effective management of groundwater. my country has a vast territory and diverse land types, and the groundwater problems faced by each region are different. For irrigated areas with severe salinization in my country, improper irrigation leads to excessive local groundwater levels, and groundwater brings salt to the surface through soil capillary action to form salinization, which causes soil compaction, reduces crop yields, and seriously leads to barren soil. At present, the mai...

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Problems solved by technology

The main purpose is to lower the groundwater level or improve the soil, but the cost of improving the soil is high and it is not conducive to the local ecological environment. At the same time, there is no clear goal to reduce the groundwater level through hydraulic engineering measures. To what extent can the water level be reduced to prevent salinization At present, it is mainly judged and analyzed through the observation of groundwater level and the salinization of the surface

This method is simple and intuitive, but because of the lack of mechanism of action and physical process, it has poor generality and is difficult to popularize and apply.

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