乌梁素海水环境容量分析

Environment Capacity of the Wuliangsuhai Lake

【目的】研究乌梁素海的水环境容量特征和探索水环境容量与入湖水质水量间的响应关系。【方法】采用零维模型分别计算并分析了乌梁素海冰封期与非冰封期的水环境容量,基于水文实际条件,分析入湖水量对出口断面污染物质量浓度的影响。【结果】冰封期湖泊的自净容量小于非冰封期时的自净容量,且冰封期的氮和有机物污染物的环境容量远小于非冰封期。【结论】非冰封期引入的黄河水和农田退水会导致湖泊氮磷水环境容量下降。有机物污染物的水环境稀释容量会因为黄河引水增加。

【Objective】Understanding the eco-environmental capacity of surface water is crucial to its sustainable management. The objective of this paper is to present the results of an analysis of the environmental capacity of Wuliangsuhai lake as well as its associated impacting factors.【Method】The analysis was based on the measured water inflow into the lake, and the change in contaminant concentrations at the outlet during both frozen and nonfrozen seasons.【Result】The self-cleaning capacity of the lake was weaker during the frozen season than during the non- frozen season, and the concentration of nitrogen and organic pollutants during the frozen season was much lower than that during the non-frozen season.【Conclusion】During the non-frozen season, the water taken from the Yellow river and the receding water from the farmland in the region combined to reduce the capacity of the lake for nitrogen and phosphorus, while the dilution by the Yellow river water increased the capacity of the lake for organic pollutants.