Underground curtain for preventing seawater invasion and purifying residual saline water and construction method thereof

Abstract

The invention provides an underground curtain for preventing and controlling seawater invasion and purifying residual salt water and a construction method thereof, and the construction method comprises the following steps: determining seawater invasion, an underground aquifer and other related areas according to hydrogeological conditions of a coastal region; the combined underground curtain comprises two wall bodies which are distributed front and back in the water flow direction of underground water, a top suspension type wall body is located on one side of an inland underground aquifer, and a sunken type wall body is located on one side close to seawater. The sunken wall body is arranged at the bottom of the aquifer, and the lower part is embedded into the impermeable bedrock; the upper opening of the wall body is positioned between the local sea level and the 10% seawater salinity isoline of the salt water wedge; the upper suspension type wall body is arranged on the upper portion of the aquifer and is built from the earth surface, an opening is reserved in the bottom of the aquifer, and the bottom end of the upper suspension type wall body needs to be lower than the top end of the sunken type wall body; the distance between the upper suspension type wall body and the sunken type wall body is 1 / 5-4 / 5 of the height of the sunken type wall body; by means of the technical scheme, seawater invasion can be effectively prevented and treated, and residual salt water in the upstream underground water source after the underground curtain is built is removed.

Description

technical field [0001] The invention relates to the technical field of prevention and control of seawater intrusion, in particular to an underground curtain for preventing seawater intrusion and purifying residual salt water and a construction method thereof. Background technique [0002] The density of seawater is greater than that of groundwater, and seawater in coastal areas can invade inland aquifers driven by the density difference, and form a saltwater wedge in the lower part of the aquifer, which is called seawater intrusion. The intrusion of seawater directly leads to the salinization of underground freshwater, which seriously affects the water for humans and animals in coastal areas; it leads to varying degrees of salinization of the soil, and a significant decline in agricultural production; at the same time, the underground saltwater in coastal aquifers causes wells to be scrapped and underground equipment to corrode . It can be seen that seawater intrusion not o...

AI Technical Summary

Problems solved by technology

[0005] Because the full-section underground curtain completely cuts off the discharge of groundwater, it leads to the enrichment of pollutants in the upstream groundwater; the sunken underground curtain traps the front end of the saltwater wedge in the upstream aquifer, and the underground freshwater may be polluted by residual saltwater; Curtains are prone to failure when the water table upstream is low

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