Analysis of Water Salinization Rules and Influence Factors in Beidagang Reservoir
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Abstract:
Aims at the problem of water sanilization widespread existed in Tianjin coastal reservoirs,the field investigation and sampling analysis method were conducted to vertical distribution of salinization in various seasons for Beidagang reservoir. Water salinization mechanism of reservoir and its impact factors were analyzed. Results show that from to the each site's representative sanilization index, such as electric conductivity, chloride ion and total dissolved solid (TDS),relative to the water diverted from the Yellow River, the sanilization tendency was presented for each site of reservoir, and the water sanilization phenomenon of outer was obviously higher than that of entrance. In different sites of the reservoir, the average level of electric conductivity, chlorine ion and TDS of reservoir water was 867.5μs/cm,0.41 g/L and 1.46 g/L respectively. It was weak alkaline in different sites of reservoirs. Seasonal variation characteristics of salinization indicators, such as Electric conductivity, chloride ion and TDS of Beidagang reservoir were showed that in winter was slightly higher than in spring. Vertical variation characteristics of the reservoir water of chloride ion and TDS vertical changed not significantly, and presented that chloride ion and TDS decreases with the increase of depth, but presented the opposite rule for electric conductivity. The study found that the sanilization of reservoir water quality was influence by soil salinity, temperature and the mixing actions.The closer to the coastline, and the higher soil salt content was, and the more serious sanilization phenomenon of water quality was from to the sites' horizontal distribution of sanilization index. Temperature rising would affect the release of salt from the sediment, and the higher the temperature was, the easier release for the chlorine ion of sediment was. Vertical mixing action were happened, and leading to little vertical direction change of chloride ion and TDS.
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