Law of Salt Release at Soil-water Interface in Beidagang Reservoir
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Abstract:
In order to investigate the water salinization mechanism in Beidagang reservoir of Tianjin, field sampling method and laboratory column experiment were conducted to examine the rule of salt release between the bed sediment and overlying water body under reservoir filling. The results showed that (1) a salinity variation zone (diffusion boundary layer) exists in the water body of 10 cm above the sediment and water interface when salt is released from bed sediment. About 60% of the total released salt accumulates in the diffusion boundary layer, and the vertical variation of water salinity is insignificant above the diffusion boundary layer; (2) the accumulative amount of salt released from the bed sediment conforms to the form of logarithmic function with time, and the accumulative amount of released salt in the first 50 days of the experiment can reach 80% of the total amount; and (3) the variation of salt flux at the sediment and water interface shows periodic characteristics with a rapidly initial increasing and then a slow decline within each period.
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