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泸沽湖温度分层季节变化研究

发表时间:2014-12-31  浏览量:1496  下载量:460
全部作者: 赵雪枫,王倩,刘正文
作者单位: 暨南大学生命科学技术学院,水生生物研究中心;中国科学院南京地理与湖泊研究所
摘 要: 2011年8月至2013年10月,对云南泸沽湖垂直剖面水温进行了连续监测。根据监测数据,利用Lake Analyzer软件计算了湖泊稳定度、混合深度及温跃层深度等指标。结果表明:泸沽湖为单次混合型湖泊,头年12月下旬至次年3月上旬为混合期,湖泊稳定度平均不足20 J/m2;3月中下旬至5月下旬为分层形成期,湖泊稳定度由50 J/m2提高至数百J/m2,温跃层位置不稳定,在13.0~18.5 m范围内跳跃,偶尔出现在表层2 m,这一时期可达到的混合深度较夏季深,平均为14 m;5月底至8月中下旬为稳定期,稳定度迅速升高至2 000 J/m2以上,并在8月中旬取得最大值(2012年为2 874 J/m2),温跃层最初稳定在10 m左右,随后缓慢下降至12 m左右,混合深度较形成期浅,最初在9 m左右,缓慢下移至10 m左右;消失期分2个阶段,8月下旬至10月上旬,湖泊稳定度保持在1 000 J/m2以上,温跃层深度及混合深度在20 m 以内,下降缓慢,而温跃层强度基本稳定;10月下旬至12月下旬,各项分层指标迅速下降,最终温度分层消失。
关 键 词: 水体环境学;温度分层;湖泊稳定度;混合深度;温跃层深度
Title: Seasonal variations of thermal stratification in Lugu lake
Author: ZHAO Xuefeng, WANG Qian, LIU Zhengwen
Organization: Research Center of Hydrobiology, College of Life Science and Technology, Jinan University; Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences
Abstract: To study the seasonal variations of thermal stratification in Lugu lake, vertical water temperature profile was monitored from August 2011 to October 2013. Lake stability, mixing depth and thermocline depth were calculated using Lake Analyzer accordingly. Results showed that Lugu lake is a monomictic lake whose holomixing period lasted from late December to early March next year with average lake stability less than 20 J/m2. Seasonal thermal stratification were usually formed from mid or late March to late May with the lake stability slowly increasing from 50 J/m2 up to hundreds. Thermocline depth varied from 13.0 m to 18.5 m and even up to the first 2 m of the surface layer occasionally. The mixing depth at this time of the year was larger than that in winter with an average 14 m. Then, lake stability would raise rapidly to more than 2 000 J/m2 and peaked in mid or late August (maximum value 2 874 J/m2 was found in August 2012). Thermocline depth became stable, which firstly occurred at around 10 m then gradually sank down to about 12 m below the surface the same as the mixing depth went from 9 m to 10 m. From late August to early October, lake stability was still above 1 000 J/m2 with mixing depth and thermocline depth stayed in the first 20 m, while the strength of thermocline remained stable. All three indexes of seasonal stratification showed a steep declining trend from the late October and disappeared by the end of December to start the seasonal variation all over again.
Key words: water environmentology; thermal stratification; lake stability; mixing depth; thermocline depth
发表期数: 2014年12月第24期
引用格式: 赵雪枫,王倩,刘正文. 泸沽湖温度分层季节变化研究[J]. 中国科技论文在线精品论文,2014,7(24):2441-2448.
 
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