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Research Article

A Study on the Correlation between Persistence of Rainfall and Frequency of Landslide Occurrence

강우 지속성과 산사태 발생 빈도의 연관성에 관한 연구

Youjin Jeong1
,
Junghae Choi2*
정 유진1
,
최 정해2*
1Undergraduate Student, Department of Earth Science Education, Kyungpook National University
2Professor, Department of Earth Science Education, Kyungpook National University
1경북대학교 지구과학교육과 학부과정
2경북대학교 지구과학교육과 교수
*Corresponding Author
31 December 2021. pp. 631-646
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Abstract

Increasing incidences of landslides in Korea are endangering life and damaging property. To ascertain the cause of the rapid increase in landslides in 2020, this study analyzed the correlation between frequency of their occurrence and persistence of rainfall. The study area comprised seven areas in Gangwon-do, Gyeonggi-do, Gyeongsangnam-do, Gyeongsangbuk-do, Jeollanam-do, Jeollabuk-do, and Chungcheongnam-do. The used rainfall factors were monthly rainfall in June, July, and August, rainfall during the summer (June-August), rainfall during the monsoon season, and number of precipidays during the summer and during the monsoon season. The effect of these factors on landslides was identified by comparing them with the occurrence of landslides in the year of increased landslide occurrence in each area. The results confirmed that not only rainfall but also the number of precipitation days during the monsoon season affect the occurrence of landslides. The rapid increase in landslide occurrence in 2020 was attributed to increases in both the number of precipitation days during the monsoon season and rainfall during the monsoon season in 2020. These results are expected to be used as basic data for future landslide warning standards that consider the effect of the persistence of rainfall.

Keywords
rainfall
precipitation days
monsoon season
landslide

본 연구에서는 2011년부터 2020년까지의 연구지역에서 발생한 산사태와 강우 요인들을 통해 강우 지속성과 산사태 발생 빈도의 연관성을 분석하였다. 연구지역은 강원도, 경기도, 경상남도, 경상북도, 전라남도, 전라북도, 충청남도의 총 7개 지역이며 분석에 활용한 강우 요인은 6월, 7월, 8월의 월 강우량과 여름기간(6~8월) 강우량, 장마기간 강우량, 여름기간 강수일수, 장마기간 강수일수이다. 연구지역별로 산사태 발생이 많았던 해의 강우 요인을 비교 ‧ 분석하여 강우 지속성이 산사태 발생에 미치는 영향을 파악하였다. 연구결과 강우량뿐만 아니라 장마기간 강수일수도 산사태 발생에 영향을 미치는 것으로 확인되었으며, 2020년의 산사태 발생 급증은 2020년의 장마기간 강수일수가 많은 것에서 기인한 것으로 추정되었다. 이러한 결과는 추후 강우 지속성의 영향을 고려한 산사태 경보 기준의 기초 자료로 활용될 수 있을 것으로 기대된다.

키워드
강우량
강수일수
장마
산사태
References
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 31
  • No :4
  • Pages :631-646
  • Received Date : 2021-12-06
  • Revised Date : 2021-12-16
  • Accepted Date : 2021-12-21
  • DOI :https://doi.org/10.9720/kseg.2021.4.631
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