폭풍해일과 강우에 의한 해안 도시 범람 수치모의
Numerical Simulation of Coastal Urban Inundation due to Storm Surge and Rainfall
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초록
본 연구에서는 태풍 매미에 의해 큰 피해를 입은 마산지역을 대상으로 폭풍해일과 강우에 의한 범람 수치모의를 수행하였다. 이를 위해 폭풍해일-강우-우수관망 결합 수치모형을 사용하였다. 그 결과, 기존의 폭풍해일만을 이용하였을 경우보다 강우와 우수관망 수치모형을 고려하였을 때의 침수면적 및 침수고가 크게 증가한 것을 확인하였다. 또한 마산시에서 추진 중인 방재언덕을 설치하였을 때의 침수범람결과를 추가적으로 수치모의 하여 방재언덕의 실효성을 검토하였다. 그 결과 방재언덕의 영향으로 폭풍해일에 의한 최대 침수심은 저감되었으나, 우수가지상부에서 바다로 원활하게 배수되지 못해 침수지속기간이 증가하는 것을 확인하였다.
Abstract
In this study, numerical simulations are conducted for the inundations due to storm surge and rainfall atMasan City of Korea where severe damages occurred by the typhoon Maemi. A coupled numerical model which candeal with various flow patterns such as storm surge, rainfall and sewer flows is employed. The numerical resultsshow that the inundation area and depth increase significantly when the combined effects of storm surge and rainfallare considered in comparison with those obtained without a rainfall effect. Further numerical simulations areconducted to evaluate the performance of the sea wall being constructed for the coastal defence. The results showthat the maximum inundation depths decrease when the sea wall is constructed. However, the duration of inundationbecomes longer, because the rainwater on the ground cannot be discharged easily to the sea due to the presence ofthe sea wall.
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