摘要
为分析千岛湖极端水位变化对温跃层的影响,在水温垂直剖面数据缺测情况下,采用率定后的一维水动力模型DYRESM模拟了不同水位变幅下的温跃层,并设置了极端水位变化情况(情景1)和正常水文条件(情景2)两种情景进行对比分析;基于湖泊分析程序Lake Analyzer计算了两种情景下温跃层表层和底层深度、温跃层厚度和施密特稳定度等。模拟结果表明:情景1水体混合期为2013年11月20日至2014年3月23日,同时段内情景2水体混合期则为2013年12月5日至2014年3月16日;情景1在高水位时,湖体从上到下呈“混合层、温跃层、均温层(30~40 m水层)、温跃层、均温层”的双温跃层结构,同时段内情景2则呈“混合层、温跃层、均温层”的单温跃层结构;情景1与情景2相比,平均水位低2.24 m,施密特稳定度均值低119.19 J/m^(2),可见极端水位变化条件下出现的低水位情况能显著降低水体稳定度。
To provide substantial information of extreme water level fluctuations(EWLF)on thermal stratification at Lake Qiandao,the DYRESM model was used to simulate water levels at different scenarios with lack of observed water temperature.This study set up two scenarios including one with EWLF(scenario 1)and the other one with normal hydrological condition(scenario 2)to compare their vertical structure of water temperatures.Based on Lake Analyzer,the depths of top and bottom of thermocline,thermocline thickness and Schmidt stability were calculated for both two scenarios.The results show that the water was mixed during November 20th 2013 to March 23th 2014 in scenario 1 and was mixed during December 5th 2013 to March 16th 2014 in scenario 2.The vertical water temperature structure followed a pattern of“mixed layer-thermocline-hypolimnion(30-40 m)-thermocline-hypolimnion”from top to bottom in scenario 1 and it followed a pattern of“mixed layer-thermocline-hypolimnion”from top to bottom in scenario 2 with the same meteorological conditions.The average water level in scenario1 was less than that in scenario 2 by 2.24 m.Schmidt stability in scenario 1 was also less than that in scenario 2 by 119.19 J/m^(2),showing that the extreme low water level will significantly reduce the water stability.
作者
龚发露
王裕成
兰佳
罗纯良
罗潋葱
李慧赟
张如枫
GONG Falu;WANG Yucheng;LAN Jia;LUO Chunliang;LUO Liancong;LI Huiyun;ZHANG Rufeng(School of Ecology and Environmental Science,Yunnan University,Kunming 650500,China;Chun’an Branch of Hangzhou Bureau of Ecology and Environment,Hangzhou 311700,China;Kunming Dianchi and Plateau Lake Research Institute,Kunming 650500,China;Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第5期33-40,共8页
Journal of Hohai University(Natural Sciences)
基金
云南省重点研发计划社会发展专项(202001BB050078)
云南大学人才引进科研启动项目(C176220100043)
国家自然科学基金(41671205,42171034)。
