Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Estimation of Direct Runoff Variation According to Land Use Changes in Jeju Island

제주도 토지이용변화에 따른 직접유출량 변화 추정

  • Published : 2009.08.28
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Abstract

SCS method was applied to make the assessments of direct runoff according to land use changes in Jeju island. Land uses were obtained from 5 year-period remote sensing time series data from 1975 to 2000 which are provided by Water Management Information System (WAMIS). Hydrologic soil groups were categorized based on soil series of National Academy of Agricultural Sciences (NAAS), and permeable geologic structures such as Sumgol, Gotzawal and so on. The land uses of Jeju island are obviously characterized by urban-agricultural areas increases, and forest areas decrease. According to land use changes, curve number (CN) for Jeju island was consistently increased from 65.3 in 1975 to 69.6 in 2000. From 1975 to 2000, the amount of direct runoff and ratios increased due to CN changes. When the rainfall data in 1995 was applied to each year, the direct runoff amounts were $299.0{\sim}351.6\;mm$, and runoff ratios were $15.1{\sim}17.7%$. In the case of the application of the rainfall data in 2000, the direct runoff amounts were $136.9{\sim}161.5\;mm$, and runoff ratios were $9.7{\sim}11.5%$. Since direct runoff can be closely related to groundwater recharge and sustainable groundwater yield, the groundwater influence caused by land use changes or district exploitations should be considered for the reasonable water management and development in Jeju island.

제주도의 토지이용 변화에 대한 직접유출량의 변화를 알아보기 위하여 SCS 방법에 의한 직접유출량을 산정하였다. 토지이용자료는 국토해양부에서 운영하는 국가수자원관리종합정보시스템(WAMIS)에서 제공하는 1975년부터 2000년까지 5년 주기의 위성 영상으로부터 추출 분류된 자료들을 이용하였으며, 토양도, 투수성 지질구조 분포를 토대로 수문학적 토양군을 분류하였다. 제주도의 1975년부터 2000년까지 토지이용은 도시화 및 지역 개발 등에 의한 산림지역의 감소와 시가화 지역과 농지 증가가 뚜렷하게 나타나고 있다. 그에 따라 제주도의 평균 유출곡선지수는 1975년에 65.3이었던 것이 2000년에는 69.6으로 지속적으로 증가되었다. 유출곡선지수의 증가로 인하여, 년간 직접유출량은 1995년도의 강우량을 적용했을 때 299.0 mm에서 351.6 mm로, 직접유출률은 15.1%에서 17.7%로 증가된 것으로 산정되며, 2000년도의 강우량을 적용했을 때에는 직접유출량이 년간 136.9 mm에서 161.5 mm로, 직접유출률은 9.7%에서 11.5%로 증가된 것으로 평가되었다. 이러한 직접유출량의 변화는 지하수 함양량과 지하수 개발 가능량의 변화로 이어지기 때문에, 합리적인 물관리에 있어서 토지이용변화, 지역개발에 의한 물수지 변화 등을 면밀하게 검토할 필요가 있다.

Keywords

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