A Study on the Recharge Characteristics of Groundwater in the Jeju Samdasoo Watershed Using Stable Water Isotope Data

Youngsung Shin; Taehyeong Kim; Suhyung Moon; Seong-Taek Yun; Dukchul Moon; Heejoo Han; Kyounggu Kang

doi:10.7857/JSGE.2021.26.3.025

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2021 Vol.26, Issue 3 Preview Page Next Page

A Study on the Recharge Characteristics of Groundwater in the Jeju Samdasoo Watershed Using Stable Water Isotope Data 안정동위원소를 이용한 제주삼다수 유역의 지하수 함양 특성 연구

30 June 2021. pp. 25-36

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Abstract

This study evaluated monthly, seasonal and altitudinal changes of oxygen and hydrogen isotope compositions of wet precipitation samples (n = 238) that were collected for last four years from 7 altitudes (from 265 to 1,500 m above sea level) in the Jeju Samdasoo watershed at the southeastern part of Jeju island, in order to examine the recharge characteristics of groundwater that is pumped out for the production of the Samdasoo drinking mineral water. Precipitation samples showed a clear seasonal change of O-H isotopic composition as follow, due to the different air masses and relative humidity: δD= 7.3δ¹⁸O+ 11.3 (R² = 0.76) in the wet season (June to September), while δD= 7.9δ¹⁸O + 9.5 (R² = 0.91) in the dry season (October to May). In contrast, the stable isotope compositions of groundwater were nearly constant throughout the year and did not show a distinct monthly or seasonal change, implying the well-mixing of infiltrated water during and after its recharge. An altitudinal effect of the oxygen isotope compositions of precipitation was also remarkable with the decrease of –0.19‰ (R² = 0.91) with the elevation increase by 100 m. Based on the observed altitudinal change, the minimum altitude of groundwater recharge was estimated as 1,200 m above the sea level in the Jeju Samdasoo watershed.

Keywords

Groundwater recharge

Jeju Samdasoo watershed

Recharge altitude

Oxygen and hydrogen isotopes of precipitation

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Information

Publisher :The Korean Society of Soil and Groundwater Environment
Publisher(Ko) :한국지하수토양환경학회
Journal Title :Journal of Soil and Groundwater Environment
Journal Title(Ko) :지하수토양환경
Volume : 26
No :3
Pages :25-36
Received Date : 2021-05-31
Revised Date : 2021-06-05
Accepted Date : 2021-06-17
DOI :https://doi.org/10.7857/JSGE.2021.26.3.025

Journal of Soil and Groundwater Environment ISSN:1598-6438(Print) 2287-8831(Online) 지하수토양환경

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