Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Development of Storm Sewer Numerical Model for Simulation of Coastal Urban Inundation due to Storm Surge and Rainfall

폭풍해일과 강우에 의한 해안 도시 범람 수치모의를 위한 우수관망 수치모형의 개발

  • Yoon, Sung Bum (Dept. of Civil, Env. and Plant Engrg, ERICA Campus, Hanyang University) ;
  • Lee, Jaehwang (Dept. of Civil & Env. Engrg, Graduate School, Hanyang University) ;
  • Kim, Gun Hyeong (Dept. of Civil & Env. Engrg, Graduate School, Hanyang University) ;
  • Song, Ji Hoon (Dept. of Civil & Env. Engrg, Graduate School, Hanyang University)
  • 윤성범 (한양대학교 건설환경플랜트공학과) ;
  • 이재황 (한양대학교 대학원 건설환경공학과) ;
  • 김건형 (한양대학교 대학원 건설환경공학과) ;
  • 송지훈 (한양대학교 대학원 건설환경공학과)
  • Received : 2014.10.16
  • Accepted : 2014.10.24
  • Published : 2014.10.31
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Abstract

Since most of the researches on the coastal inundation due to typhoons have considered only storm surges, an additional inundation due to rainfall has been neglected. In general, typhoons are natural disasters being accompanied by the rainfall. Thus, it is essential to consider the effect of rainfall in the numerical simulation of coastal inundation due to storm surges. Because the rainwater is discharged to the sea through the storm sewer system, it should be included in the numerical simulation of storm surges to obtain reasonable results. In this study an algorithm that can deal with the effects of rainfall and sewer system is developed and combined with a conventional storm surge numerical model. To test the present numerical model various numerical simulations are conducted using the simplified topography for the cases including the inundation due to rainfall, the drainage of rainwater, the backflow of sea water, and the increase of sea water level due to drainage of rainwater. As a result, it is confirmed that the basic performance of the present model is satisfactory for various flow situations.

기존의 태풍에 의한 해안 범람 수치모의 연구의 대부분은 폭풍해일만을 고려하였으므로 강우에 의한 추가적인 침수는 배제되어 왔다. 일반적으로 태풍은 강우를 동반한 자연재해이므로 폭풍해일에 의한 해안 도시범람을 수치모의 하는 데 있어 반드시 강우의 영향이 고려되어야 한다. 또한 강우는 도시 우수 관망을 통해 바다로 배출되므로 강우를 동반하는 폭풍해일 수치모의 시 우수관망 시스템이 고려되어야 타당한 결과를 얻을 수 있다. 본 연구에서는 기존의 폭풍해일 수치모형에 강우와 우수관망을 해석할 수 있는 알고리즘을 추가하여 수치모형을 개발하였다. 개발된 수치모형을 단순화된 지형에 적용하여 강우에 의한 범람과 우수의 배수, 해수의 역류현상, 우수의 배수에 따른 해수면 상승 등 기본적인 수치모형의 기능을 검사하였다. 그 결과 다양한 조건에서 수치모형이 정상적으로 작동되는 것을 확인하였다.

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References

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