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2021 Vol.8, Issue 2

Short Communications

The Interrelationship between Riparian Vegetation and Hydraulic Characteristics during the 2020 Summer Extreme Flood in the Seomjin-gang River, South Korea

2020 여름 섬진강 대홍수시 하안식생과 수리 특성의 상호관계

Cheolho Lee1
,
Keonhak Lee2
,
Hwirae Kim3
,
Donghae Baek4
,
Won Kim5
,
Daehyun Kim6
,
Hyunjae Lee7
,
Hyoseop Woo8
,
Kang-Hyun Cho9*
이 철호1
,
이 건학2
,
김 휘래3
,
백 동해4
,
김 원5
,
김 대현6
,
이 현재7
,
우 효섭8
,
조 강현9*
1Doctor Student, Department Biological Sciences and Bioengineering, Inha University, Incheon 22212, Korea
2Master Student, Department of Geography, Seoul National University, Seoul 08826, Korea
3Master Student, Department Biological Sciences and Bioengineering, Inha University, Incheon 22212, Korea
4Postdoctoral Researcher, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
5Senior Research Fellow, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
6Professor, Department of Geography, Seoul National University, Seoul 08826, Korea
7Vice president, Department of Water Resources, Korea Engineering Consultants Corp., Seoul 05288, Korea
8Professor, School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
9Professor, Department of Biological Sciences, Inha University, Incheon 22212, Korea
1인하대학교 바이오시스템융합학과 박사과정
2서울대학교 지리학과 석사과정
3인하대학교 바이오시스템융합학과 석사과정
4한국건설기술연구원 국토보전연구본부 박사후연구원
5한국건설기술연구원 국토보전연구본부 선임연구위원
6서울대학교 지리학과 교수
7한국종합기술 수자원부 부사장
8광주과학기술원 지구환경공학과 교수
9인하대학교 생명과학과 교수
*Corresponding Author
30 June 2021. pp. 79-87
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Abstract

Because active interactions occur among vegetation, hydrology, and geomorphology in riparian systems, any changes in one of these factors can significantly affect the other two. In this study, we evaluated these interactions at four sites (two in Gajeong and two in Hahan) along the Seomjin-gang River that was substantially devastated by an extreme flood in 2020. We examined the relationship between the riparian vegetation and the hydraulic characteristics of the flood using remote sensing, hydraulic modeling, and field surveys combined. The evaluation results showed that the floods caused a record-breaking rise of up to 43.1 m above sea level at the Yeseong-bridge stage gauge station (zero elevation 27.4 m) located between the Gajeong and Hahan sites, with the shear stress being four times higher in Hahan than in Gajeong. Additionally, the water level during the flood was estimated to be a maximum of 1 m higher depending on the location in the presence of riparian plants. Furthermore, both sites underwent extensive biological damage due to the flood, with 78-80% loss in vegetation, with preferential damage observed in large willow species, compared to Quercus acutissima. The above findings imply that all plant species exhibit different vulnerabilities towards extreme floods and do not induce similar behavior towards events causing a disturbance. In conclusion, we developed strategies for effectively managing riparian trees by minimizing flood hazards that could inevitably cause damage.

Keywords
Disturbance
Flood risk
Hydraulic modeling
Remote sensing
Stream management

하천의 하안 생태계에서 식생, 수문 및 지형 사이에 상호작용이 활발하다. 이들 중 하나의 요인의 작은 변화가 다른 두 요인에 큰 영향을 미칠 수 있다. 본 연구에서는 2020년 여름 극심한 홍수로 큰 피해를 입은 섬진강의 선정된 조사지 (가정 2 개 및 하한 2 개)에서 이러한 아이디어를 평가하였다. 특히 원격탐사, 수리 모의, 현장 조사를 결합하여 대홍수시 하안식생과 수리 특성 간의 관계를 조사하였다. 섬진강 조사구간에 위치한 예성교 수위관측소 (영점표고 EL. 27.4 m)에서의 수위는 2020년 8월에 극심한 강우에 의하여 표고 43.1 m까지 상승하였다. 최대 홍수위에서 가정과 하한 조사지의 전단응력은 가정보다 하한에서 4 배 더 높았다. 또한 하안식생이 없을 조건보다 식생이 있는 경우에 대홍수시 수위가 수위가 지점에 따라 최대 1m 정도 상승할 것으로 추정되었다. 조사구간 두 곳 모두에서 대홍수에 의하여 식생 분포면적의 78-80%가 나지로 바뀌면서 광범위한 생물학적 피해를 입었다. 상수리나무와 수고가 낮은 버드나무에 비하여 수고가 높은 버드나무류가 심한 피해를 받았다. 이러한 결과는 모든 하안식물종이 극심한 홍수에 대해 동일한 취약성을 가지고 있지 않으며, 교란에 대해 동일한 종류의 피드백을 나타내지 않는다는 것을 의미한다. 따라서 하안식생의 수목을 효과적으로 관리하는 동시에 의도하지 않게 야기할 수 있는 홍수위험을 최소화하기위한 하천관리 계획이 요청된다.

키워드
교란
홍수위험
수리모의
원격탐사
하천관리
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 8
  • No :2
  • Pages :79-87
  • Received Date : 2021-03-03
  • Revised Date : 2021-03-10
  • Accepted Date : 2021-03-18
  • DOI :https://doi.org/10.17820/eri.2021.8.2.079
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