GIS를 이용한 포항시 지형 및 지질과 지하수 산출능력 간의 상관관계 분석

Analysis of Relationships Between Topography/Geology and Groundwater Yield Properties at Pohang using GIS

  • 이사로 (한국지질자원연구원 지질자원정보센터) ;
  • 김용성 (경북대학교 지질학과, (주)유신코퍼레이션) ;
  • 김남진 (경북대학교 지질학과, (주)유신코퍼레이션) ;
  • 안경환 (한국수자원공사 조사기획처 지하수조사부)
  • Lee, Sa-Ro (Geoscience Information Center, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Kim, Yong-Sung (Department of Geology, Kyungpook National University, Yooshin Engineering Corporation) ;
  • Kim, Nam-Jin (Department of Geology, Kyungpook National University, Yooshin Engineering Corporation) ;
  • Ahn, Kyoung-Hwan (Groundwater Investigation team, Korea Water Resources Corporation)
  • 발행 : 2008.02.28

초록

본 연구의 목적은 포항지역에서 지형 및 지질과 같이 지하수계에 물리적인 영향을 미치는 요인과 지하수 산출 특성과의 상관관계를 GIS(Geographic Information System)를 이용하여 정량적으로 분석하는 것이다. 이를 위해 지형고도, 지형고도차, 단위 지형경사, 광역 지형경사 등의 지형에 관련된 인자, 수문지질단위와 투수량계수(transmissivity), 비양수량(specific capacity), 양수량(well yield) 등의 지하수 산출 특성 인자를 공간 DB로 구축하였다. 그리고 이러한 지형, 지질과 지하수 산출특성 자료들과의 상관관계를 GIS 중첩분석 기법을 이용하여 정략적으로 도출하였다. 그 결과, 수문지질단위의 투수량계수는 미고결퇴적물과 다공질화산암류에서 가장 높고, 쇄설성 퇴적암류에서 가장 낮았다. 지형고도와 지형고도차는 투수량계수와 비양수량에 대해 양의 상관관계를 갖는 반면, 단위 지형경사와 광역 지형경사는 투수량계수와 비양수량에 대해 음의 상관관계를 갖는 것으로 분석되었다.

The aim of this study is to analyze relationships between topography/geology which affects physically groundwater regime and groundwater yield properties in Pohang City using Geographic Information System (GIS). For the purpose, topographic factors such as ground elevation, ground elevation difference, ground slope, and ground regional slope, and hydrogeologic unit, and groundwater yield properties factors such as transmissivity, specific capacity, and well yield, were constructed to spatial data base. Then the relationships between topography, geology and groundwater yield properties were analyzed quantitatively using GIS overlay technique. As the results, ground-water yield of unconsolidated sediments and porous volcanic rocks is the highest among the hydrogeologic units of study area, and clastic sedimentary rock is the lowest. There are positive relationship between the elevation and elevation difference and the groundwater yield properties and negative relationship between the topographic slope and the groundwater yield properties.

키워드

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