Conveyance Verification through Analysis of River Vegetation and Soil Impact using Sentinel-2

Young Jun Bang; Byeong Jun Choi; Seung Oh Lee

doi:10.21729/ksds.2021.14.4.37

All Issue

2021 Vol.14, Issue 4 Preview Page Next Page

Original Article

Conveyance Verification through Analysis of River Vegetation and Soil Impact using Sentinel-2 Sentinel-2를 활용한 하천의 식생 및 토양 영향 분석을 통한 통수능 검정

31 December 2021. pp. 37-45

PDF XML

Abstract

Flooding damage may occur due to an unexpected increase in rainfall in summer. Previously, the roughness coefficient, which is a major factor of conveyance, was calculated through on-site measurement, but in case of on-site measurement, there are many limits in accurately grasping changes in vegetation. In this study, the vegetation index (NDVI) was calculated using the Sentinel-2 optical images, and the modified roughness coefficient was calculated through the density and distribution area of the vegetation. Then the calculated roughness coefficient was applied to HEC-RAS 1D model and verified by comparing the results with the water level at the water level station directly downstream of the Soyang River dam. As a result, the error rate of the water level decreased about 14% compared to applying the previous roughness coefficient. Through this, it is expected that it will be possible to refine the flood level of rivers in consideration of seasonal flood characteristics and to efficiently maintain rivers in specific sections.

Keywords

Manning roughness

HEC-RAS 1D

NDVI

SENTINEL-2

여름철 예상치 못한 급격한 강우량의 증가로 침수 피해가 발생할 수 있으며 이 때, 하천 내 식생에 의해 통수능이 감소할 경우 제방 월류와 같은 침수의 위험성이 증가하게 된다. 기존에는 현장실측을 통해 통수능의 주요인자인 조도계수를 산정하고 있지만, 현장 실측의 경우 식생의 변화를 정확하게 파악하는데 많은 한계가 존재한다. 본 연구는 Sentinel-2 광학 이미지를 활용하여 식생지수(NDVI)를 산정하고 식생의 밀도와 분포면적을 통해 세분화된 조도계수를 산출하였다. 산출한 조도계수를 HEC-RAS 1D모의에 적용하여 소양강 댐 직하류를 대상으로 수위 관측소 수위와 결과를 비교하여 타당성을 검증하였다. 분석 결과 기존 조도계수 적용 결과보다 위성영상을 통해 산정한 세분화된 조도계수 적용 수위가 오차율이 약 14% 감소하였다. 이를 통해 계절에 따른 홍수량 특성을 고려한 하천의 홍수위의 정교화와 특정 구간에 효율적인 하천 정비가 가능할 것으로 기대한다.

키워드

Manning 조도계수

HEC-RAS 1D

NDVI

SENTINEL-2

References

Akbar, T. A., Hassan, Q. K., Ishaq, S., Batool, M., Butt, H. J., and Jabbar, H. (2019). Investigative Spatial Distribution and Modelling of Existing and Future Urban Land Changes and its Impact on Urbanization and Economy. Remote Sensing. 11(2): 105. 10.3390/rs11020105

Azad Hossain, A. K. M., Jia, Y., and Chao, X. (2009). Estimation of Manning’s Roughness Coefficient Distribution for Hydrodynamic Model using Remotely Sensed Land Cover Features. IEEE 2009(08) 17TH International Conference. 10.1109/GEOINFORMATICS.2009.5293484

Drusch, M., Del Bello, U., Carlier, S., Colin, O., Fernandez, V., Gascon, F., Hoersch, B., Isola, C., Laverinti, P., Martimort, P., Meygret, A., Spoto, F., Sy, O., Marchese, F., and Bargellini, P. (2012). Sentinel-2: ESA’s Optical High-resolution Mission for GMES Operational Services. Remote Sensing of Environment. 120(15): 25-36. 10.1016/j.rse.2011.11.026

Kim, J. S., Lee, C. J., and Kim, W. (2007). Uncertainty Analysis in Estimation of Roughness Coefficient Using the Field Measurement Data. Journal of Korea Water Resources Association. 40(10): 801-810. 10.3741/JKWRA.2007.40.10.801

Lee, G. H., Ryu, Y. U., and Park, J. S. (2020). Yeongsan River and Seomjin River Basin Flood Damage Investigation and Cause Analysis on Aug. 2020. Korea Water Resources Association. Water for Future. 53(11): 21-48.

Lee, S. E., Lee, S. O., and Park, J. W. (2021). Current States and Resent Transition for National River Maintenance. Journal of the Korean Society of Civil Engineers. 69(3): 37-44.

MOLIT (2016). Soyang River downstream area River Basic Plan (revised) Report. 2016(217). Wonju Regional Land Management Administration. Sejong: MOLIT.

Nakagawa, H., Satofuka, Y., Oishi, S., Muto, Y., Sayama, T., Takara, K., and Sharma, R.H. (2007). Rainfall and Sediment Run Off in the Lesti River Basin, Tributary of the Brantas River, Indonesia. Brantas River Workshop in Malang, Indonesia. pp. 45-51.

Nascimento Aquino, D., da Rocha, O. C., Moreira, M. A., dos Santos Teixeira, A., and de Andrade, E. M. (2018). Use of Remote Sensing to Identify Areas at Risk of Degradation in the Semi-arid Region1. Revista Ciência Agronômica. 49(3): 420-429. 10.5935/1806-6690.20180047

Noh, J. W., Shin, H. H., and Kim, H. J. (2010). Conveyance Analysis of Downstream of the Soyang Reservoir Considering the Influence of Vegetation. Journal of the Korean Society of Civil Engineers B. 30(6B): 533-540.

Rhee, D. S., Lee, D. H., and Kim, M. H. (2012). Roughness Coefficients Evaluation of the Korean Riparian Vegetation. Journal of the Korean Society of Civil Engineers B. 32(6B): 345-354. 10.12652/Ksce.2012.32.6B.345

Korean References Translated from the English

국토교통부 (2016). 소양강 하류권역 하천기본계획(변경) 보고서. 고시 제 2016(217). 원주지방국토관리청. 세종: 국토교통부.

김지성, 이찬주, 김원 (2007). 현장실측에 의한 조도계수 산정의 불확실도 평가. 한국수자원학회 논문집. 40(10): 801-810. 10.3741/JKWRA.2007.40.10.801

노준우, 신현호, 김호준 (2010). 소양강 댐 직하류 하천의 식생 영향에 의한 통수능 분석. 대한토목학회논문집. 30(6B): 533-540.

이경훈, 류용욱, 박종석 (2020). 2020년 8월 영산강·섬진강 유역 홍수 피해조사 및 원인분석. 한국수자원학회 물과 미래. 53(11): 21-48.

이동섭, 이두한, 김명환 (2012). 국내 수변 식생의 조도계수 평가. 대한토목학회논문집B. 32(6B): 345-354. 10.12652/Ksce.2012.32.6B.345

이상은, 박진원, 이승오 (2021). 국가하천 유지관리 현황과 최근 정책변화. 대한토목학회지. 69(3): 37-44.

Information

Publisher :Korean Society of Disaster and Security
Publisher(Ko) :한국방재안전학회
Journal Title :Journal of Korean Society of Disaster and Security
Journal Title(Ko) :한국방재안전학회 논문집
Volume : 14
No :4
Pages :37-45
Received Date : 2021-12-06
Revised Date : 2021-12-10
Accepted Date : 2021-12-20
DOI :https://doi.org/10.21729/ksds.2021.14.4.37

Journal of Korean Society of Disaster and Security ISSN:2466-1147(Print) 2508-285X(Online) 한국방재안전학회 논문집

All Issue

Korean References Translated from the English