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《Journal of Glaciology and Geocryology》 2008-03
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Study of the Hydrology of Glacial Runoff in Hailuogou Valley,Gongga Mountain by Means of Isotopic Tracing

YIN Guan1,WANG Xiao-dan2,GAO Zhi-you1,YAN Qiu-shi1,HUANG Yi1 (1.Department of Geochemistry,Chengdu University of Technology,Chengdu Sichuan 610059,China;2.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu Sichuan 620041,China)  
Applying the fundamental and method of isotopic tracing,in this paper the runoff characteristics and hydrological law at the source and trunk stream of Hailuogou valley,Gongga Mountain,are investigated in different sections and at different periods.The preliminary results are as follows:(1) the water component at the source varies obvious in different seasons and different time(morning,evening).At summer evening,water from glacial region accounts for about 82.4% of the total,and water from other account for 17.6%.In summer,at the morning,water from glacial region account for about 74.6% of total,water from other regions accounts for 25.4%. The maximum of glacial meltwater amount may account for about 6.9% to 7.8% of the total.In winter,the isotope compositions of runoff from the glacial tongue(BCH-1) and Glacier Hydrological Station(HLG-6) are lower than that from glacier bottom(BCB-2:-16.639),showing an obviously isotopic unbalance.This reflects that in winter,being substituted by dominant rain and snow from upper glacier,the meltwater from glacier bottom accounts for a little of the total,which indicates that the contribution rate of local glacier evidently decreases in winter as compared with that in summer.(2) Below the Glacier Hydrological Station,distinct isotopic abnormity takes place in the region of Daozhongqiao and Shanshuping.The isotopic tracing shows that there exists water leakage near the Glacier Hydrological Station,which may stretch to Daozhongqiao(over sampling location HLG-13) in summer.The leakage water flows through underground channels and supplies the river again in Shanshuping region(sampling location HLG-2).These results may provide very useful clue for studying the shrinking rate of the Hailuogou Glacier,a maritime type glacier.
【Fund】: 国家重点基础研究发展计划(973计划)项目(2005CB422000)资助
【CateGory Index】: P343.6
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