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Research Article

Probable annual maximum of daily snowfall using improved probability distribution

개선된 확률밀도함수 적용을 통한 빈도별 적설심 산정

Heeseong Parka
,
Gunhui Chungb*
박 희성a
,
정 건희b*
aResearch Fellow, Department of Land, Water and Environment Research, Korea Institute of Civil engineering and building Technology (KICT)
bAssociate Professor, Department of Civil Engineering, Hoseo University
a한국건설기술연구원 국토보전연구본부 연구위원
b호서대학교 건축토목환경공학부 토목공학전공 부교수
* Corresponding Author
30 April 2020. pp. 259-271
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Abstract

In Korea, snow damage has happened in the region with little snowfalls in history. Also, accidental damage was caused by heavy snow leads and the public interest on heavy snow has been increased. Therefore, policy about the Natural Disaster Reduction Comprehensive Plan has been changed to include the mitigation measures of snow damage. However, since heavy snow damage was not frequent, studies on snowfall have not been conducted on different points. The characteristics of snow data commonly are not the same as the rainfall data. Some southern coastal areas in Korea are snowless during the year. Therefore, a joint probability distribution was suggested to analyze the snow data with many 0s in a previous research and fitness from the joint probability distribution was higher than the conventional methods. In this study, snow frequency analysis was implemented using the joint probability distribution and compared to the design codes. The results were compared to the design codes. The results of this study can be used as the basic data to develop a procedure for the snow frequency analysis in the future.

Keywords
Conditional probability
Design standard of snow loads
Frequency analysis
Joint probability distribution
Daily snowfall

우리나라도 최근 들어 과거 눈이 거의 내리지 않던 지역에 폭설이 내리거나 대설에 의한 인명피해가 발생하는 등의 대설 피해가 발생하며, 대설 및 설해 피해에 대한 관심이 증가하고 있다. 그러므로 자연재해저감 종합계획에 대설에 의한 설해 대비를 포함하는 등의 정책적인 변화가 생겼으나, 우리나라는 그동안 대설 피해가 많지 않았었기 때문에 대설이나 적설 자료의 특성에 대한 연구를 다양한 각도에서 수행한 적이 거의 없다. 우리나라의 적설자료는 강우자료와 특성이 다른 경우가 많다. 예를 들어, 우리나라 남해안 일부 지역은 연중 눈이 한 번도 내리지 않는 경우가 다수 있어, 연최대치계열 자료 중에 값이 없는 경우가 빈번히 존재한다. 이에 0이 다수 포함된 자료의 빈도해석을 위해 조건부결합확률분포를 이용하여 확률밀도함수를 선정하는 방법을 적용하였다. 그 결과 기본 방법에 비해 적합도가 더 높은 확률밀도함수를 구할 수 있었으며, 100년 빈도 이상의 긴 재현기간에서 기존 방법에 비해 대체로 적설심이 작아지는 경향을 보였다. 본 연구에서는 본 연구에서는 0이 다수 포함된 자료의 빈도해석을 위해 조건부결합확률분포를 제안한 선행연구를 적용하여 우리나라 전국의 적설 관측지점에 대한 빈도해석을 수행하고, 그 결과를 설계에 사용되는 값들과 비교하였다. 본 연구의 결과는 향후 수문학적 적용을 위한 적설자료의 관측 및 분석 방법에 대한 세부적인 기준 마련을 위한 기초자료로 활용될 수 있을 것이다.

키워드
빈도해석
신적설
적설설계기준
조건부결합확률
확률밀도함수
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 53
  • No :4
  • Pages :259-271
  • Received Date : 2019-11-17
  • Revised Date : 2020-03-18
  • Accepted Date : 2020-03-18
  • DOI :https://doi.org/10.3741/JKWRA.2020.53.4.259
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