Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Analysis of groundwater level variability in the middle mountain area of Pyoseon watershed in Jeju Island using normalized standard deviation and cross correlation coefficient

정규화된 표준편차 및 교차상관계수를 이용한 제주도 표선유역 중산간지역의 지하수위 변동성 분석

  • Shin, Mun-Ju (Water Resources Research Team, Jeju Province Development Corporation) ;
  • Moon, Soo-Hyoung (Water Resources Research Team, Jeju Province Development Corporation) ;
  • Moon, Duk Chul (Water Resources Research Team, Jeju Province Development Corporation)
  • 신문주 (제주특별자치도개발공사 수자원연구팀) ;
  • 문수형 (제주특별자치도개발공사 수자원연구팀) ;
  • 문덕철 (제주특별자치도개발공사 수자원연구팀)
  • Received : 2020.02.24
  • Accepted : 2020.03.24
  • Published : 2020.05.31
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Abstract

In order to provide information for proper management of groundwater resources, an analysis of the effects of precipitation and groundwater withdrawal on groundwater levels is needed. In this study, we analyzed the correlation of precipitation-groundwater level and groundwater withdrawal-groundwater level using time series data converted by normalized standard deviation (Nor.St.Dev) and cross correlation coefficient (CCC) for nine groundwater monitoring wells in the middle mountainous area in the southeastern Jeju Island. First, the CCCs of precipitation-groundwater level were estimated using daily time series data, and the low CCCs of up to 0.3 were obtained. However, the result of using the Nor.St.Dev showed a clearer correlation by obtaining a CCC of up to 0.8. In addition, in most cases, precipitation variability and groundwater level variability had positive CCCs, whereas groundwater withdrawal variability and groundwater level variability had negative CCCs. Therefore, the groundwater level in this study area was largely influenced by precipitation with little effect of groundwater withdrawal. Lastly, as a result of analyzing the relative effects of Seongpanak and Gyorae rainfall station on the groundwater level, the rainfall at the relatively downstream Gyorae rainfall station has more influence. The analysis method used in this study can be easily used for analyzing the effects of precipitation and groundwater withdrawal on groundwater level variability in other regions in the future.

지하수자원의 적절한 관리를 위한 정보제공을 위해서는 강수량과 지하수 취수가 지하수위에 미치는 영향분석이 필요하다. 본 연구에서는 제주도 남동쪽 표선유역 중 산간지역 9개 지하수위 관측정 지점을 대상으로 정규화된 표준편차에 의해 변환된 시계열자료와 교차상관계수를 이용하여 강수량-지하수위 및 지하수취수량-지하수위 간의 상관성을 비교분석하였다. 먼저 일단위 원시 시계열자료를 이용하여 강수량-지하수위의 교차상관계수를 산정한 결과 최대 0.3의 낮은 교차상관계수를 가졌으나 정규화된 표준편차를 이용한 결과는 최대 0.8의 교차상관계수를 얻음으로써 더욱 명확한 상관성을 확인할 수 있었다. 또한 강수량의 변동성과 지하수위의 변동성은 대부분 양의 교차상관계수를 가졌으나, 취수량의 변동성과 지하수위의 변동성은 대부분 음의 교차상관계수를 가짐으로써 본 연구 대상지역의 지하수위는 취수량의 영향은 거의 받지 않고 강수량의 영향을 크게 받음을 확인하였다. 마지막으로 성판악과 교래 강우관측소가 관측정 지하수위에 미치는 상대적인 영향을 비교분석한 결과 상대적으로 하류쪽에 위치한 교래 강우관측소의 강수량이 더 영향을 미치는 것으로 분석되었다. 본 연구에서 사용한 지하수위 변동분석 방법은 향후 다른 지역의 강수량과 지하수 취수량이 지하수위 변동성에 미치는 영향분석에 간편하게 활용될 수 있을 것으로 판단된다.

Keywords

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