Variation characteristics of salinity in water of drainage ditches in saline lands
Pan Yanxin, Luo Wan, Jia Zhonghua, Li Jin, Chen Yuan
Northwest Key Laboratory of Water Resource and Environment Ecology, Ministry of Education, Xi′an University of Technology, Xi′an, Shaanxi 710048, China
Abstract：The drainage ditches in the saline lands around Lupuotan Lake,Shaanxi Province are periodically full of water due to the blockage of drainage outlet and received huge amount of irrigation water returned from two upstream irrigation districts, causing a change in salinity concentration in the water body of the drainage ditches. To reveal the actual variation characteristics of salinity, the salinity in the water of three drainage ditches was monitored over two years. The results showed that the increase in salinity was apparent in the drainage ditches during the dry season from upstream to downstream in the studied lands, and the electrical conductivity of water in the upstream ditches was varied between 2 and 14 ms/cm, but it was as high as 25.2 ms/cm in the downstream ditches. The fresh water from two upstream irrigation districts was recharged into the drainage ditches regularly, and the salt accumulation was destroyed. As a result, the salinity was diluted by more than 10 times and the electrical conductivity of that water was lowered down to 1.9 ms/cm. Such periodic dilutions allow a relatively low salinity level to be kept and a salt balance to be maintained in the water body of the drainage ditches studied.
潘延鑫, 罗纨, 贾忠华, 李进, 陈远. 盐碱地排水沟水体盐分变化规律[J]. 排灌机械工程学报, 2013, 31(9): 811-815.
Pan Yanxin, Luo Wan, Jia Zhonghua, Li Jin, Chen Yuan. Variation characteristics of salinity in water of drainage ditches in saline lands. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(9): 811-815.
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