巴丹吉林沙漠车日格勒湖水深分布与水温分层特征  

Bathymetric survey and thermal stratification of Lake Cherigele in the Badain Jaran Desert

作　　者：李克祖 曹乐[3] 孟令群[3] 刘学全[3] 闫冬鸣 LI Kezu;CAO Le;MENG Lingqun;LIU Xuequan;YAN Dongming(Institute of Hydrogeology and Engineering Geology,Gansu Bureau of Geology and Mineral Exploration and Development,Zhangye 734000,China;Institute of Hydrogeology and Environmental Geology,Shijiazhuang 050061,China;Gansu Key Laboratory of Groundwater Engineering and Geo-thermal resources,Zhangye 734000,China)

机构地区：[1]甘肃省地矿局水文地质工程地质勘察院,张掖734000 [2]甘肃省地下水工程及地热资源重点实验室,张掖734000 [3]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《干旱区资源与环境》2018年第12期137-144,共8页Journal of Arid Land Resources and Environment

基　　金：国家青年科学基金项目(41702285); 中国地质调查项目(121201106000150093); 基本科研业务费(SK201505)联合资助

摘　　要：为了研究巴丹吉林沙漠车日格勒的湖底地形结构、温度分层特征及成因,于2016年6月1日对车日格勒5条剖面上66个测点进行水深、水温和电导率测量。结果表明:(1)车日格勒整体呈浅碟状,最大水深8.20m,湖底中部存在东西向隆起,将湖盆分为南北两个平坦的小湖盆;近岸水域存在不同规模的钙华陡坎。(2)湖水垂直变化的分层特征明显:混合层由湖面到水下3m,水温、电导率相对均匀;水深3~4m为相对高温区;4m以下为温跃层,平均梯度值达3.5℃/m,湖底水温仅10.5℃,电导率随水深增加而变大,平均梯度值8.264(m S/cm)/m。对比8月9日测量结果,混合层厚度增至6m,水体温度升高5~6℃。湖泊分层主要受太阳辐射、气温、风力、湖水电导率差异影响,淡水补给作用、湖盆结构次之。两期数据显示车日格勒为半混合湖泊,确定其混合类型仍需对水温、电导率、水位等参数进行常年全剖面观测。Most lakes at Badain Jaran Desert are now still lack of basal information,especially the survey of water temperature stratification and the discussion about its causes. In this study,field investigation including bathymetric survey and water quality measurements were conducted at 5 sections and 66 stations of lake Cherigele which is one of the largest lakes in the Badain Jaran Desert,in June 1 st and 2 nd,2016. The results showed that： 1） Isobathic map shows that lake Cherigele looks like a shallow dish and the maximum water depth is 8.2 m. This lake is divided into north and south lake basins because there is a uplift from east to west lay on the lakebed. There are some slopes with 1 ～ 2 m deep down near the shore at the lakebed,which is considered to be made from tufa. 2） According to the vertical variations of water temperature in June,water temperature of lake Cherigele could be divided into three layers with distinctly various features. The first layer as mixolimnion is from surface to 3 m depth in which water temperature and conductivity are relatively uniform. The second layer ranges about 3 ～ 4 m is a relatively high temperature area. And the bottommost layer is characterized with the linear decrease with the 3. 5℃/m gradient value. The conductivity value constantly increases with the 8. 264（ m S/cm）/m gradient value. According to the temperature stratification comparison between in June 1 st and Aug. 9 th,we can find the water temperature of Cherigele rises in 5 ～ 6℃,while the thickness of mixolimnion increasing to6 m. In brief,we conclude that solar radiation and wind are the principal reason resulting in water temperature-layering and changes of the thermocline,and the freshwater inflow and lake basin structure take the second place. More data and information about water temperature,conductivity and water level throughout the year are needed to ensure which type of Cherigele is.

关 键 词：分层 温跃层 电导率 车日格勒 巴丹吉林沙漠 

分 类 号：K928.43[历史地理—人文地理学]