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Groundwater and surface water interactions in an alluvialplain, Tuul River Basin, Ulaanbaatar, Mongolia
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Citation of this paper:Maki Tsujimura,Koichi Ikeda,Tadashi Tanaka,Lunten Janchivdorj,Badamgarav Erdenchimeg,Damdinbazar Unurjargal,Ramasamy Jayakumar,2013.Groundwater and surface water interactions in an alluvialplain, Tuul River Basin, Ulaanbaatar, Mongolia.Sciences in Cold and Arid Regions,5(1):0126~0132.
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Author NameAffiliationE-mail
Maki Tsujimura Division of Sustainable Environmental Studies, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan mktsuji@geoenv.tsukuba.ac.jp 
Koichi Ikeda Division of Sustainable Environmental Studies, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan  
Tadashi Tanaka Division of Sustainable Environmental Studies, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan  
Lunten Janchivdorj Institute of Geo-ecology, Mongolian Academy of Sciences, Ulaanbaatar 211238, Mongolia  
Badamgarav Erdenchimeg Institute of Geo-ecology, Mongolian Academy of Sciences, Ulaanbaatar 211238, Mongolia  
Damdinbazar Unurjargal Institute of Geo-ecology, Mongolian Academy of Sciences, Ulaanbaatar 211238, Mongolia  
Ramasamy Jayakumar UNESCO Beijing Office, Waijiaogongyu 5-15-3 Jianguomenwai Compound, Beijing 100600, China  
 
Abstract:Drinking water supplies in Ulaanbaatar, the capital of Mongolia, are completely dependent on groundwater sourced from pumping wells located in an alluvial plain of the Tuul River which flows through Ulaanbaatar. The interaction between groundwater in the alluvial plain and river surface water was investigated using a hydrological and multi-tracers approach. The observed groundwater contour map clearly shows that the Tuul River recharges the floodplain groundwater and groundwater flows from east to west. The similarity of chemical and stable isotopic compositions suggests that groundwater is mainly recharged by Tuul River water in the vicinity of the river. In addition, considering groundwater contours and chemical composition, groundwater in the northern and southern mountain sides contribute to floodplain groundwater. Stable isotopic information suggests that winter season precipitation also contributes to the groundwater, because groundwater in a specific region has a considerably lower isotopic ratio. Using the End Member Mixing Analysis applying oxygen-18, SiO2 and HCO3 - as tracers, the contribution ratios of the Tuul River, groundwater in the northern and southern mountain regions, and winter season precipitation to floodplain groundwater are estimated to be 58% to 85%, 1% to 54%, 0% to 16%, and 0% to 12%, respectively.
keywords:groundwater  river water  interaction  recharge  Ulaanbaatar
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