Selective permeable reactive barrier technique for controlling seawater invasion

Abstract

The invention relates to a selective permeable reactive barrier technique for controlling seawater invasion, which is used for avoiding waste of precious freshwater resources due to union pumping prior to discharge of freshwater and sweater in artificial pumping. The technique includes: pumping wells (3) are built between a land (1) and a sea (2), walls and bottom plates of the pumping wells (3) are made of selective permeable reactive barriers (4), and the selective permeable reactive barriers (4) are composed of porous medium (6) and salt-sensitive material (7). In freshwater, the salt-sensitive material (7) absorbs water to swell to block pores of the porous medium (6), and freshwater (5) cannot permeate the selective permeable reactive barriers (4) to enter the pumping wells (3). In seawater, the salt-sensitive material (7) dehydrates to shrink to allow pores of the porous medium (6) to be open, and seawater (5) can permeate the selective permeable reactive barriers (4) to enter the pumping wells (3). The pumping wells built based on the selective permeable reactive barriers can be used for preventing seawater invasion and treating sweater invasion.

Description

technical field [0001] The invention relates to a selective permeation reaction wall technology for preventing seawater intrusion, which belongs to the field of resources and environment. Background technique [0002] Seawater intrusion is a global problem, and the situation of seawater intrusion in my country is also very serious. According to the latest survey data, the area of ​​seawater intrusion in my country has exceeded 10,000 km 2 , the salinized area is more than 13500km 2 , of which the area of ​​seawater intrusion in Shandong Province alone exceeds 4,000 km 2 The salinization of cultivated land, the pollution of domestic water sources, and the corrosion of underground facilities caused by seawater intrusion seriously restrict the economic and social development of coastal areas. [0003] At present, the prevention and control of seawater intrusion mainly include: limited exploitation of groundwater, artificial recharge, artificial pumping, and construction of u...

AI Technical Summary

Problems solved by technology

Artificial recharging needs to consume a lot of surface fresh water resources, part of the fresh water flows into the ocean in vain, and a large number of water diversion projects need to be built, and the water quality requirements for recharging water are also high

Building underground cutoff walls between salty and fresh water in the coastal zone can prevent seawater intrusion and store underground freshwater to a certain extent, but the cost of underground cutoff walls is high, and it hinders the discharge of groundwater, which may cause ecological damage to coastal areas. It may also lead to salinization of the surface soil due to the rise of the groundwater table during the wet season

Artificial pumping uses pumping to form a low water level. The pumped water is a mixture of seawater and fresh water. Generally, it cannot be used for water supply and wastes a lot of fresh water resources.

Images