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설계 강우량의 재현빈도 변화에 따른 도시유역의 침수특성 분석

An Analysis on Inundation Characteristics of Urban Watershed according to Variation in Return Period of Design Rainfall

  • Park, InHyeok (Department of Urban Engineering, Chungbuk National University) ;
  • Ha, SungRyong (Department of Urban Engineering, Chungbuk National University)
  • 투고 : 2013.05.02
  • 심사 : 2013.11.13
  • 발행 : 2013.11.30

초록

본 연구는 강우 시 지표수의 관거 내 재유입을 고려할 수 있는 이중배수체계 모형을 활용하여 청주시의 설계 강우량에 따른 도시 유역의 침수를 모의하고 설계 강우량의 재현기간 변화에 따라 달라지는 침수특성을 분석하고자 한다. 이를 위해 청주시의 LiDAR 데이터로부터 $1m{\times}1m$ 해상도의 지표고도모델을 구축하여 입력 자료로 활용하였으며, 재현기간별 설계 강우량을 수문 입력 자료로 활용하였다. 분석 결과, 재현기간이 증가함에 따라 홍수량은 선형적인 증가를 보이지만, 침수면적은 재현기간 30년 이후 증가율이 완화되는 것으로 나타났으며, 평균 침수심의 경우 재현기간 30년 설계 강우량과 재현기간 200년 빈도 설계 강우량을 사용한 경우에 큰 폭의 증가가 발생했다. 한편 대상지역 내 주요 지점에 대한 통수부족량 산출 결과, 재현기간 10년의 설계 강우량을 활용한 경우에는 모두 통수 부족이 발생하지 않았으나 그 이상의 설계 강우량부터 통수부족이 발생하였다. 대상 지역 전체에 대한 통수 부족량 산출 결과, 재현기간 10년 이상의 설계 강우량부터 통수 부족량이 큰 폭으로 증가하나 설계 강우량의 재현기간이 50년을 넘어가면 통수 부족량의 증가율이 둔화되는 것으로 나타났다.

This study aims to investigate inundation characteristics such as inundated area, inundation depth according to variation in return period of design rainfall and to draw a comparison between the inundation characteristics by adapting design storm using dual-drainage model. Lidar data is used to construct terrain data with $1m{\times}1m$ resolution in Cheongju. The designed storm by return periods(10year, 30year, 50year and 200year) are acquired from Intensity Duration Frequency curve, which are distributed in 5 minutes interval using Huff's method. As a results, the inundation volume is linearly increased, but inundated area is gradually increased in accordance with swell of return period for design storm. On the other hands, as a result of calculating discharge capacity for each points, deficit of discharge capacity is not observed using designed storm of 10 year return period at every points. If the return period is increased up more than 10 years, both the deficit of discharge capacity for each PT and entire study area are enlarged drastically.

키워드

참고문헌

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  1. Analysis of Inundation Causes in Urban Area based on Application of Prevention Performance Objectives vol.18, pp.1, 2016, https://doi.org/10.17663/JWR.2016.18.1.016
  2. Analysis of Urban Inundation Considering Building Footprints Based on Dual-Drainage Scheme vol.17, pp.4, 2014, https://doi.org/10.11108/kagis.2014.17.4.040
  3. Classification Criteria of Urban Basin for Medium and Small Stream using Characteristics of Land Use: Focus on Gimhae-si vol.16, pp.1, 2016, https://doi.org/10.9798/KOSHAM.2016.16.1.131
  4. Application of Hydro-Cartographic Generalization on Buildings for 2-Dimensional Inundation Analysis vol.18, pp.2, 2015, https://doi.org/10.11108/kagis.2015.18.2.001