Salty water-fresh water replacing and leaching desalting device for coupled phreatic aquifer

Abstract

The invention discloses a salty water-fresh water replacing and leaching desalting device for a coupled phreatic aquifer. The device comprises a field desalting assembly, a saline water treatment assembly and a rainwater collection wetland. The field desalting assembly comprises a plurality of desalting units, a water inlet component and a drainage component, and each desalting unit comprises a desalting unit contour, a water inlet branch part and a partition plates; the saline water treatment assembly comprises a sedimentation tank, an overflow weir, an ecological corridor and a filter pipe;and the rainwater collection wetland comprises a water-impermeable layer, a water collecting tank, a water distribution well, a perforated communicating pipe and a water storage porous medium. According to the invention, underground water of saline-alkali soil is changed, and the underground water is gradually desalted through a plurality of cycles; and on the other hand, a mode of rotation irrigation of brackish water and rainwater is adopted, so that precious fresh water resources in coastal regions are saved, collected rainwater is fully utilized to be added into the cycle of the underground phreatic aquifer, and therefore, the problem of desalination of coastal saline-alkali soil is fundamentally solved.

Description

technical field [0001] The invention relates to the field of saline-alkali land irrigation, in particular to a device for replacing salty and fresh water in a submerged layer and leaching and desalting. Background technique [0002] Coastal tidal flats are an important reserve land resource in our country and an effective measure to solve the contradiction between man and land in our country. [0003] The biggest limiting factor for the development of coastal tidal flats is the severe salinization of the land, which makes it difficult to realize large-scale reclamation and planting and other agricultural activities. The main cause of land salinization is serious groundwater salinization, specifically as follows. [0004] 1. When the rainy season comes, the underground phreatic water level rises, bringing salt water to the soil surface. When the phreatic water level drops, the salt will be adsorbed on solid particles and stay in the soil. [0005] 2. Evaporation of the land...

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Problems solved by technology

[0005] 2. The evaporation of the land surface intensifies the loss of water on the soil surface, resulting in more serious salt analysis, which remains on the land surface

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