KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Effect Analysis of Precipitation Events According to an Urbanization

도시화가 강수사상에 미치는 영향 분석

  • 오태석 (서울시립대학교 공과대학 토목공학과 수자원연구실) ;
  • 문영일 (서울시립대학교 공과대학 토목공학과)
  • Received : 2010.04.05
  • Accepted : 2010.06.08
  • Published : 2010.08.31
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Abstract

Urbanization means the sudden increment of a population and the industrialization. The hydrologic water cycle causes many changes due to urbanization. Therefore, the affects that urbanization influences on the precipitation events were analyzed. But the precipitation events are very much influenced many meteorological and climatologically indices besides the effect of an urbanization. So, an analysis was performed by using precipitation data observed in many spots of the Korean peninsula. The analysis data are annual precipitation, the duration 1 daily maximum amount of precipitation, the rainy days, and 10 mm over the rainy days, and 80 mm. seasonal precipitation and seasonal rainy days. The analytical method classified 4 clusters in which the precipitation characteristic is similar through the cluster analysis. It compared and analyzed precipitation events of the urban and rural stations. Moreover, the representative rainfall stations were selected and the urban stations and rural stations were compared. In the analyzed result, the increment of the rainy days was conspicuous over 80mm in which it can cause the heavy rainfall. By using time precipitation data, the design precipitation was calculated. Rainfall events over probability precipitation on duration and return period were analyzed. The times in which it exceeds the probability precipitation in which the urban area is used for the hydrologic structure design in comparison with the rural area more was very much exposed to increase.

도시화란 급격한 인구의 증가와 산업화를 의미하며, 도시화로 인해서 수문학적 물순환과정은 많은 변화를 일으키게 된다. 본 연구에서는 도시화가 강수사상에 끼치는 영향을 분석하였다. 강수사상은 도시화의 효과 이외에도 여러 기후학적인 인자와 기상학적인 요인에 의한 영향을 많이 받게 된다. 따라서 한반도의 여러 지점에서 관측된 강수 자료를 이용하여 분석에 적용하였다. 분석대상자료는 연강수량, 지속기간 1일최대강수량, 강수일수, 10 mm 이상 강수일수, 80 mm 이상 강수일수, 계절별 강수량 및 계절별 강수일수이다. 분석방법은 군집분석을 통해 강수특성이 비슷한 4개의 군집을 구분하여, 군집별로 도시지역과 비도시지역에서 발생한 강수사상을 비교분석하였다. 또한, 대표지점을 선정하여 도시화 지점과 비도시화 지점을 비교분석하였다. 분석 결과에서 호우 피해를 야기할 수 있는 80 mm 이상 강수일수의 증가가 두드러졌다. 시간강수량 자료를 이용하여 확률강수량을 산정하고, 지속시간별 재현기간별 확률강수량을 초과하는 강우사상을 분석하였다. 도시지역이 비도시지역에 비해서 수공구조물 설계에 이용되는 확률강수량을 초과하는 횟수가 더 많이 증가한 것으로 나타났다.

Keywords

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