Drainage well layout calculation method for relieving soil secondary salinization

Abstract

The invention relates to a drainage well layout calculation method for relieving soil secondary salinization. The method comprises the steps that the critical burial depth of salinized underground water is determined; hydrogeological parameters of a research area are determined; the underground water drawdown of a salinization area is determined; the influence radius of drainage wells is calculated; and reasonable layout of the drainage wells in the salinization area is determined. By taking the salinized underground water critical burial depth as a management and control target, the reasonable underground water drawdown of the secondary salinization area is accurately determined, and the influence radius of the drainage wells is determined by analyzing the influence of water pumping of the drainage wells on the underground water level, so that the underground water level of the secondary salinization area is accurately reduced by reasonably arranging the drainage wells, and secondarysalinization caused by the over-high underground water level of a local area due to unsmooth drainage of irrigation return water is remarkably and effectively relieved. The method has universality forsolving the problem of soil salinization caused by the too high underground water level, and reliable theoretical and technical supports are provided for guiding treatment of soil salinization and reasonable development and utilization of underground water resources.

Description

technical field [0001] The invention relates to a drainage well layout calculation method for improving soil secondary salinization, is a calculation method for hydrology and water conservancy, and is a calculation method for improving the ecological environment. Background technique [0002] Secondary salinization is one of the main threats to my country's agricultural security. It is of great significance to determine reasonable and effective technical methods to improve secondary salinization according to local conditions to alleviate secondary salinization in my country. Especially in the arid and semi-arid areas of Northwest my country, due to the unreasonable discharge of irrigation return water, the groundwater level in some areas has risen, evapotranspiration has intensified, and soil salt has accumulated on the surface with capillary water migration to form salinization. Therefore, it is necessary to reduce the groundwater level. The treatment of secondary salt clari...

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Problems solved by technology

For the technical method of lowering the groundwater level, the current common practice is to use alkali drainage ditches, etc. In practice, some areas have insignificant treatment effects due to topography or poor self-flow of alkali drainage canals, and there is no clear way to lower the groundwater level. The goal is that the groundwater level drops too deep, resulting in an increase in water demand for crops after improvement, and the groundwater level drops too shallow, failing to achieve the goal of improving secondary salinization

The Chinese patent with the publication number CN 109061105 A discloses a method for calculating the critical groundwater burial depth of salinization. The patent clarifies the process of soil salinization by analyzing the principle that groundwater brings salt to the surface through capillary action. The definition The critical burial depth that causes soil salinization has been specified, but it has not been proposed to further solve the problem of how to improve the secondary salt. The critical buried depth of soil salinization, but no specific measures on how to solve soil salinization

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