滨海盐碱地区包气带中淡水透镜体维持机理

doi:10.13278/j.cnki.jjuese.201601203

Abstract

Abstract:

Rainfall recharge is an important source for the shallow groundwater of coastal saline areas. The depth of saline groundwater level is shallow. In the process of precipitation infiltration into the soil at different permeability in vadose zones, freshwater lens will be formed above phreatic surface at a certain time. The freshwater lens can partially stop the soil and plants from being damaged by the underground salt water, and supply plants with water to some extent. The authors made an indoor physical simulator for this study. By controlling soil structure, the formation and regression process of freshwater lens under precipitation infiltration was simulated; and the maintenance of freshwater lens in different type of soil was discussed. Also, by using suction pipe to simulate the plant roots water absorption, the changes of freshwater lens were observed under different water absorption conditions. The results showed that the freshwater lens maintained the best in the soil structure where the upper layer was medium sand and the bottom layer was silty clay. The freshwater lens reached maximum thickness at about 15 cm in 1500 min and maintained about 7500 min. The stable freshwater lens formed in the double layers soil could separate the underground salt water, and provide 243.5 mL freshwater for the plants above.

Key words: coastal saline area, shallow groundwater, vadose zone, freshwater lens, laboratory simulation experiment

CLC Number:

P641.69

Zhao Lin, Mo Huiting, Zheng Yi. Maintenance Mechanism of Freshwater Lens in Vadose Zone on Coastal Saline Areas[J].Journal of Jilin University(Earth Science Edition), 2016, 46(1): 195-201.

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