Groundwater net discharge rates estimated from lake level change in Badain Jaran Desert, Northwest China  

作　　者：Xingfan WANG Hui ZHAO Yongwei SHENG Jianwei GENG Keqi WANG Hongyu YANG 

机构地区：[1]Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Enviroment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]CAS Center for Excellence in Tibetan Plateau Earth Sciences,Chinese Academy of Sciences,Beijing 100101,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Department of Geography,University of California,Los Angeles,CA 90095,USA

出　　处：《Science China Earth Sciences》2020年第5期713-725,共13页中国科学（地球科学英文版）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences,Pan-Third Pole Environment Study for a Green Silk Road(Pan-TPE)(Grand No.XDA20090000);the National Natural Science Foundation of China(Grand No.41771016);NASA’s Surface Water and Ocean Topography(SWOT)Program(Grand No.NNX16A85G).

摘　　要：Over a hundred sizable lakes,some even larger than^1 km2,are distributed across the lowlands between megadunes in the southeastern Badain Jaran Desert(BJD),northwest China.With rather limited precipitation and hardly any surface runoff,these lakes are fed mainly by groundwater.However,the source of the groundwater and the groundwater discharge rates to these lakes are poorly understood.Water level and temperature of four representative lakes in the southeastern BJD were monitored continuously between 2013 and 2017.Water surface evaporation and rainfall in this area were also measured.Combining these acquired data,groundwater discharge rates were estimated using water balance models.The results show that the four lakes have similar recharge and discharge patterns,but at different average net groundwater discharge rates ranging from 1.79 to 3.09 mm d?1.The lake level variation mainly depends on groundwater discharge and lake surface evaporation.We found that diurnal lake level variation may be controlled by earth tide and atmospheric pressure change,and is five times greater than the evaporation.The desert precipitation and deep confined groundwater with high temperature were found also recharging the desert lakes.An Empirical Mode Decomposition(EMD)method was used to identify the lake level trend.All lake levels increased over the last four years,except one decreased in 2015 and 2016.The lake levels’increasing trend is synchronously similar with the precipitation in north China.This study analyzes annual and seasonal lake level variations,and also finds the diurnal water cycle between the groundwater and lake water for the first time.

关 键 词：GROUNDWATER DISCHARGE LAKE level Water BALANCE Badain Jaran DESERT 

分 类 号：P641[天文地球—地质矿产勘探] P343.3[天文地球—地质学]