Experimental Study on Dispersion of Saline Water Flowing through Clay-bearing Soil
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Abstract:
Regional water quality structure is constituted by deep freshwater and shallow salt water in the east of North China Plain (NCP). Evidences showed that salinity of deep freshwater did not increase significantly when it was supplied by shallow saline water. To examine whether the clay-bearing soil can intercept the salt from water, this study conducted the permeability tests to analyze the dispersion effects of saline water flowing through the clay-bearing soil. The results showed that (1) clay-bearing soil can intercept most of salt in the saline water, which confirms the existence of salt-filtering phenomenon in the eastern deep aquitard of NCP; (2) the intercept capacity of clay-bearing soil increases with the decreasing of permeability and dispersivity. ; and (3) the possible reason of salt-filtering is that Na+ in saline water is adsorbed by solid colloid particles or has cation exchange interaction with some components absorbed by soil colloids.
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