Construcción de un modelo conceptual para el flujo de aguas subterráneas confinadas en la cuenca del Gunii Khooloi, Región del Gobi Meridional, Mongolia

Translated title of the contribution: Construction of a conceptual model for confined groundwater flow in the Gunii Khooloi Basin, Southern Gobi Region, Mongolia

Batdemberel Bayanzul, Kengo Nakamura, Isao Machida, Noriaki Watanabe, Takeshi Komai

Research output: Contribution to journalArticle

Abstract

Groundwater plays a vital role in the arid Southern Gobi Region (SGR) of Mongolia. It is the only source of water supply and is largely utilized for mining operations, such as those at Oyu Tolgoi Mine. The area is expected to face severe water shortages for mining and drinking water, which may be related to changes in groundwater recharge due to climate change. Understanding the geochemical evolution of groundwater and recharge mechanisms is thus paramount for water resource management. In this study, for the first time, chemical and isotopic approaches have been used to characterize the groundwater origin and its associated recharge processes in the Gunii Khooloi basin, which is located in the SGR. Shallow groundwater is mainly characterized by Na(HCO3) and NaCl type; however, Gunii Khooloi aquifer is classified as NaCl type with high electrical conductivity. The stable isotope composition of the water in the deep Cretaceous confined aquifer shows depletion in 2H and 18O relative to modern rainfall and the Quaternary shallow aquifer, which indicates a weak interaction between the two aquifers. Modern groundwater was identified in the shallow streambed aquifer, probably due to the direct infiltration of rainfall. On the other hand, 14C ages in the deep groundwater range from 2,800 to 33,500 years, which suggests that this is paleowater that was recharged during the glacial age. The results indicate that there is a need for strategic groundwater management in the Gunii Khooloi basin.

Translated title of the contributionConstruction of a conceptual model for confined groundwater flow in the Gunii Khooloi Basin, Southern Gobi Region, Mongolia
Original languageSpanish
Pages (from-to)1581-1596
Number of pages16
JournalHydrogeology Journal
Volume27
Issue number5
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • Arid regions
  • Groundwater origin
  • Hydrochemistry
  • Mongolia
  • Stable isotopes

ASJC Scopus subject areas

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

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