兴凯湖生态水位分析

Analysis of ecological water level of Xingkai Lake

基于兴凯湖1914～1957年水位过程线和水位-面积-库容曲线,通过计算兴凯湖多年平均和80%保证率水平年的来水量,并结合近期和远期需水量,进行水量平衡分析。结果表明,兴凯湖具有较大的调节功能,即使连续6年出现历史上水位从多年平均水位下降至历史最低水位,兴凯湖也能满足近期和远期水量需求。经分析、计算和推理,认为以1925年兴凯湖水位67.88 m为最低生态水位是合适的。

Based on the stage hydrographs and the stage-area capacity curves of Xingkai Lake from 1941 to 1957, the mean annual water yields and the water yields in a year with a guarantee frequency of 80% were calculated. These results, added to the water demands in the near future and after a long term, were used in the water balance analysis. The analysis results show that Xingkai Lake has a large regulation capacity： even during a 6-year decline of the water level, from the mean annual water level to the lowest water level recorded historically, Xingkai Lake also can meet the water demands both in the near future and in the long tenn. After a detailed analysis, calculation and deduction, it is believed that a water level of 67.88 m is a suitable lowest ecological water level.