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A Note on Estimating and Managing Groundwater Reserves

지하수 부존량 평가와 관리에 대한 소고

  • Lee, Byung Sun (Rural Research Institute, Korea Rural Community Corporation) ;
  • Park, Jong Hwan (Rural Research Institute, Korea Rural Community Corporation) ;
  • Myoung, Wooho (Rural Research Institute, Korea Rural Community Corporation) ;
  • Son, Joohyeong (Gyeoungnam Regional Headquarter, Korea Rural Community Corporation) ;
  • Lee, Sanghaw (Gyeounggi Regional Headquarter, Korea Rural Community Corporation) ;
  • Shim, Gyuseong (Gyeoungnam Regional Headquarter, Korea Rural Community Corporation) ;
  • Song, Sung-Ho (Rural Research Institute, Korea Rural Community Corporation)
  • 이병선 (한국농어촌공사 농어촌연구원) ;
  • 박종환 (한국농어촌공사 농어촌연구원) ;
  • 명우호 (한국농어촌공사 농어촌연구원) ;
  • 손주형 (한국농어촌공사 경남지역본부) ;
  • 이상화 (한국농어촌공사 경기지역본부) ;
  • 심규성 (한국농어촌공사 경남지역본부) ;
  • 송성호 (한국농어촌공사 농어촌연구원)
  • Received : 2018.10.29
  • Accepted : 2018.11.23
  • Published : 2018.12.31

Abstract

This study was conducted to estimate groundwater reserves within a designated depth. Three methods were applied to one representative county in southern Gyeongsang province, South Korea, to estimate the groundwater reserves in the aquifers. Estimated amounts of groundwater reserves in the region ranged from $20.2{\times}10^9m^3$ to $68.7{\times}10^9m^3$ (average $37.9{\times}10^9m^3$). Groundwater recharge obtained with a recharge ratio of 16.6% was $1.1{\times}10^9m^3/year$. Exploitable groundwater with an assumption of decadal-cycle minimal rainfall of 977.0 mm/year was approximated as 72% ($0.8{\times}10^9m^3/year$) of the total replenished water by recharge. The volume of recharge and exploitable water accounted for only 1.1% and 0.8% of groundwater reserves, respectively, which indicates substantial capacity of the reservoir to supply groundwater in an event of unexpected droughts. Nonetheless, each groundwater well should strictly comply with its allocated pumping rate to avoid alluvial groundwater depletion.

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Fig. 1. Simplified cross-section of groundwater bearing aquifer.

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Fig. 2. The global distribution of lithology with depth and the global average porosity with depth that is filled with groundwater (in oblique lines) (Gleeson et al., 2016).

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Fig. 3. Geology of Yangsan county (modified after GSK, 1964).

Table 1. Hydrogeology of Yangsan county (GSK, 1964)

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Table 2. A comparison of presumed groundwater reserves based on three selective methods

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Table 3. A rate of groundwater recharge amounts and exploitable amounts compared with groundwater reserves in Yangsan city

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Table 4. A change of groundwater reserves in accordance with a long-term fluctuation of groundwater level

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Acknowledgement

Supported by : 환경부

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