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Research Article

A Study on the Corelation between the Variation of Land Cover and Groundwater Recharge Using the Analysis of Landsat-8 OLI Data

Landsat-8 위성을 통한 토지피복 변화와 지하수 함양량 상관성 고찰

Seunghyuk Park1
,
Gyo-Cheol Jeong2*
박 승혁1
,
정 교철2*
1General Manager, Joongang Consultant Co., Ltd.
2Professor, Department of Earth and Environmental Sciences, Andong National University
1중앙컨설턴트(주) 지하수환경부 부장
2안동대학교 지구환경과학과 교수
*Corresponding Author
30 September 2020. pp. 347-378
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Abstract

Based on monthly average groundwater recharge over a nearly 10 year period, results of fully integrated hydrologic modeling of SWAT-MODFLOW, land cover, land use, soil type and hydrologic response unit (HRU) was used to assess the dominant influencing factors of groundwater recharge spatial patterns in Jangseong district. As dominant factors, land cover was FRSE (forest-evergreen) and soil type was Samgag. Landsat-8 OLI imaging spectrometer data were acquired in the period 2003 to 2004 and seasonal bare soil lines (BSL) were estimated through NIR-RED plot. Extent of slope of BSL was from 1.092 to 1.343 and the intercept was from -0.004 to -0.015. To know correlation between spatial groundwater recharge and soil-vegetation indices (PVI, NDVI, NDTI, NDRI), this study employed frequency and regression analysis. On May, RED band increased up 3 to 4 times compared to other seasons and only one turning point appeared as recharge-index with upward parabola bell shape as results of existing research. Considering precipitation, if the various studies for relationship between groundwater recharge and soil-vegetation index just like NDVI are performed, it is possible to estimate groundwater recharge through analyzing remote sensing data.

Keywords
SWAT-MODFLOW
groundwater recharge
hydrologic response unit (HRU)
Landsat-8
bare soil line (BSL)

SWAT-MODFLOW의 월평균 수문성분 자료를 바탕으로 지하수 함양관련 토양층의 측방유출, 침루량을 산정하는 기본자료인 수문응답단위(HRU)와 이를 구성하는 토지피복, 토지이용, 토양통에서 영향이 큰 지하수 함양량 인자를 분석하였다. 봄, 가을별 bare soil line(BSL)을 통해 PVI를 분석하고 기존의 NDVI, NDTI, NDRI와 함께 함양량 분포와 토양-식생관련 지수의 빈도분석과 회귀분석을 수행하였다. 그 결과 비정규분포 양상을 보이는 NDVI와 NDTI에서 매우 유의한 양의 상관성이 확인되었다. 연구지역의 bare soil line 기울기는 약 1.092~1.343, 절편은 약 -0.004~-0.015이며 상대적으로 월평균강우량이 우세한 5월에는 Red밴드가 다른 시기에 비해 약 3~4배 증가하고 2012년 Singhal and Goyal의 결과와 같이 포물선 형태의 유일한 1개의 변곡점이 발생하는 것을 확인하였다. 따라서 강우를 고려하여 지하수함양과 토양-식생관련 지수에 대한 다양한 경우의 상관성 분석이 수행된다면, 위성영상자료를 통해 토양-식생에 따른 함양량 변화도 추정할 수 있을 것으로 기대된다.

키워드
SWAT-MODFLOW
지하수함양량
수문응답단위
Landsat-8
bare soil line(BSL)
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :3
  • Pages :347-378
  • Received Date : 2020-09-07
  • Accepted Date : 2020-09-17
  • DOI :https://doi.org/10.9720/kseg.2020.3.347
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