A water-saving irrigation method for rapid leaching and desalination of coastal dredged fill

Abstract

The invention relates to a water-saving irrigation method for quickly leaching and desalting coastal dredger fill. The method comprises the following steps: determining the total salt content of the dredger fill by surveying soil salt content in a region to be leached and desalted; screening and proportioning saline water which is available nearby according to the degree of mineralization less than 0.3 time but greater than 0.6 time of the total salt content of the dredger fill; preparing saline water with the degree of mineralization 0.3-0.6 time of total salt content of the soil as irrigation water; when degrees of mineralization of available water nearby are less than 0.3 time of the total salt content of soil, sequencing according to the degrees of mineralization; selecting a water source with the maximum degree of mineralization as irrigation water to irrigate; stopping when effluent salt content concentration is 1.0-1.15 times of the degree of mineralization of the irrigation water; and leaching by fresh water till the effluent salt content concentration is less than 1.0dS / ml. The method provided by the invention not only can effectively reduce use of fresh water resources, but also realize efficient resource utilization of saline water and high saline and alkaline dredger fill for desalting coastal dredging land areas.

Description

technical field [0001] The invention relates to a water-saving irrigation method, in particular to a water-saving irrigation method for rapid leaching and desalination of coastal dredged fill soil. Background technique [0002] At present, a number of dredging land reclamation projects have been carried out in Tianjin, Hebei, Shandong and other places, with an area of ​​more than 1000km 2 , Sea reclamation has become one of the important options for ocean development and alleviating human-land conflicts in the Bohai Rim region. However, the new land formed by sea reclamation has problems such as high salt content and poor water storage capacity, which has brought severe challenges to local ecological greening. The traditional coastal saline soil and dredging fill mainly use artificial soil replacement, that is, foreign soil method to rebuild the green space ecosystem. This method replaces a large number of foreign soil, which not only lacks soil sources, but also causes gre...

AI Technical Summary

Problems solved by technology

However, the new land formed by sea reclamation has problems such as high salt content and poor water storage capacity, which has brought severe challenges to local ecological greening

The traditional coastal saline soil and dredging fill mainly use artificial soil replacement, that is, foreign soil method to rebuild the green space ecosystem. This method replaces a large number of foreign soil, which not only lacks soil sources, but also causes great damage to the soil and ecological environment of the land acquisition area. destroy