지역별 홍수피해추정을 위한 강우특성에 대한 홍수피해자료의 회귀모형
Regression models on flood damage records by rainfall characteristics for regional flood damage estimates
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초록
기후변화로 인해 홍수의 빈도와 강도가 증가하고 있으므로, 구조적인 방법만으로 홍수피해에 대처하기에는 한계가 있다. 따라서, 장래 홍수피해 예측을 위해 과거 홍수피해 자료를 수집하고 분석하는 것은 비구조적인 홍수대책으로 필요한 요소중 하나이다. 본 논문에서는 지리적, 기후적 영향으로 심각한 홍수피해가 빈번하게 발생하고 있는 경상북도 지역의 홍수피해추정을 위해, 홍수피해의 주요 발생원인 중 하나인 강우특성에 대한 최근 20년(1999-2018) 동안 홍수피해자료의 회귀분석을 실시하였다. 또한, 울릉군을 제외한 22개 경상북도 시군별로 제시된 지역회귀함수의 강우특성과 지형특징과의 관계를 분석하고, 각 시군의 100년 빈도 강우량에 대한 홍수피해 위험도를 추정하였다. 홍수피해 추정결과, 경상북도에서는동해안에 인접한 군지역에서 상대적으로 높은 피해위험도가 예측되었다. 본 논문에서 개발된 지역 피해추정함수는 계획또는 예보 강우량에 대한 홍수피해 위험도를 산정하는 비구조적 대책 중 하나로 사용될 수 있을 것으로 기대한다.
Abstract
There are limitations to cope with flood damage by structural strategies alone because both frequency and intensity of floods are increasing due to climate change. Therefore, it is one of the necessary factors in the nonstructural countermeasures to collect and analyze historical flood damage records for the future flood damage assessments. In order to estimate flood damage costs in Gyeongsangbuk-do where severe flood damage occurs frequently due to geographical and climatic effects, this paper has performed the regression analysis on flood damage records over the past 20 years (1999-2018) by rainfall characteristics, which is one of the major causes of flood damage. This paper has then examined the relationship between the terrain features and rainfall characteristics in the regional regression functions, and also estimated the flood damage risk for 100-year rainfall by using the regional regression functions presented for the 22 administrative districts in Gyeongsangbuk-do excluding Ulleung-gun. The flood damage assessment shows that the relatively high damage risk is estimated for county areas adjacent to the eastern coast in Gyeongsangbuk-do. The regional damage estimate functions in this paper are expected to be used as one of the nonstructural countermeasures to estimate flood damage risk for the design or forecasting rainfall data.
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