乌梁素海覆冰特征及其对营养盐分布的影响分析  

Impact of seasonal ice cover on nutrient distribution in Ulansuhai Lake

作　　者：李畅游[1] 杨芳[1] 史小红[1] 孙标[1] 赵胜男[1] 岑睿[1] 樊才睿[1] 

机构地区：[1]内蒙古农业大学水利与土木工程建筑学院,呼和浩特010018

出　　处：《水力发电学报》2016年第11期1-8,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51339002;51269017;51669022;51509133;51569019)

摘　　要：本文采用度日法冰厚经验模型对2007—2014年冰封期内乌梁素海湖泊冰盖进行模拟计算,并结合各年冰厚及营养盐的实测数据,分析了季节性冰盖对冰封期内富营养化浅水湖泊营养盐分布特征的影响。结果表明:乌梁素海冰盖主要以热力生长为主,度日法经验模型模拟值与实测的最大冰厚结果较接近,可以用于研究区最大冰厚的预测。2007—2014年期间的冰盖厚度有减小趋势,其中2008年和2012年冰封期最长,与当年春季发生"水华"污染事件具有内在联系,并对冰封期浅水湖泊冰下水体营养盐变化趋势有指示作用,可为今后寒旱区湖泊水环境保护和健康预警提供新的思路。Ulansuhai Lake is a typical shallow lake located in a cold and arid region. We have simulated its ice thickness in winter time using an empirical degree-day model based on its daily temperature data and nutrients concentration in the ice seasons from 2007 to 2014, focusing on ice cover impact on the trophic variation of shallow lakes. The results show that the growth in the lake＇s ice cover is controlled mainly by thermal process and this degree-day model gave a satisfactory prediction of the maximum ice thickness for each year that is rather close to the measured values. For the period of 2007-2014 when the ice thickness took a decreasing trend, the simulations reveal the corresponding variations in nutrients concentration of this shallow lake in winter season. And using these results, we can explain why the longest ice cover in the years of 2008 and 2012 is possibly connected to the events of spring algal bloom in these two years. This study provides new ideas for water environmental protection and health warning of shallow lakes in cold and arid regions.

关 键 词：度日法 冰封期 季节性冰盖 浅水湖泊 乌梁素海 

分 类 号：X524[环境科学与工程—环境工程]