Variations in hydrochemical during the process of sediment salt release in coastal reservoirs
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Abstract:
Completion of the Binhai Reservoir may experience serious salinization or sudden brackishness, thus affecting the normal water supply function. The research on reservoir water salinization mainly focuses on total salinity, chloride ion, or other single indicators, but the release of sediment salt is a complex process. In fact, during the hydrogeochemical process of sediments and reservoir water, various ions may change to different degrees, and the changes of ions will affect the TDS content, which in turn affects the salinity content of the reservoir water. Therefore, the research on the regularity of salt release also needs to carry out a full analysis of ion indicators, to provide theoretical support for the hydrogeochemical interactions between sediments and reservoir water. Taking Beidagang Reservoir as the research area, through the method of combining field sampling and batch experiment, the change law of salinity and main ion indexes after the mixing of coastal reservoir water and sediment is analyzed to explore reservoir water and sediment. The hydrogeochemical interaction between the objects reveal the mechanism of reservoir salinization. Illation condition of reservoir water and sediment, the water chemical indexes can quickly reach equilibrium. The TDS mass concentration of each sampling point increased rapidly at first, and the salt release reached equilibrium after 30 s. Na+and Cl-were the main ions involved in water-rock interaction; the maximum release amounts of Na+and Cl-were 7 597.25 mg/kg, 11 097.00 mg/kg. The Na+, K+, Mg2+, Ca2+, SO42-of each sampling point increased or decreased in different degrees in the sediment-reservoir water interaction. Cl-was increased, HCO3-decreased slightly. Except for HCO3-and Ca2+, the changes of other ions showed the rule of sampling points in the downstream of the reservoir > sampling points in the upstream of the reservoir. During the hydrogeochemical process of sediment-reservoir water, the total salt in the sediment was released, and the changes of each ion in the process of salt release were related to the mass concentration difference of each ion in the sediment and the reservoir water. After mixing with the reservoir water, it will be released into the water, and the ions with very low content in the sediment will be adsorbed into the sediment after mixing with the reservoir water, resulting in the reduction of the ion content in the reservoir water. It can be seen from the experiment that the release of salt from sediments can lead to an increase in the salinity of the reservoir water, resulting in the salinization of the reservoir. In the process of salinization of the reservoir water, Na+, and Cl-are the main ions involved in water-rock interaction. The change in salinity showed the rule of sampling points downstream of the reservoir > sampling points upstream of the reservoir.
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