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2024 Vol.59, Issue 3 Preview Page

Research Article

Applicability of Hydrological Indices for Tidal Flat Mapping in the Northern Gyeonggi Bay Coast

Landsat 영상 기반 수문지수의 간석지 탐지 분야 활용성 비교 - 경기만 북부를 대상으로 -

Jongseo Yima
,
Chan-Woong Kimb*
임 종서a
,
김 찬웅b*
aSenior researcher, Center for Data Information, National Institute of Green Technology
bAssociate Research Fellow, Division of Marine Policy Research, Korea Maritime Institute
a국가녹색기술연구소 정책연구본부 데이터정보센터 선임연구원
b한국해양수산개발원 해양연구본부 해양정책연구실 부연구위원
*Corresponding Author
30 June 2024. pp. 369-384
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Abstract

This study analyzed the applicability of hydrological indices for identifying tidal flats using remote sensing in the northern region of Gyeonggi Bay on the Yellow Sea coast. Remote sensing, recognized as an alternative to field surveys due to its short survey cycle and cost-effectiveness, is particularly suited for assessing areas with limited accessibility. The high turbidity of the Yellow Sea coast complicates the distinction between tidal flats and water surfaces, necessitating a review of the reliability of methodologies before classifying tidal flats through remote sensing. This research compared globally widely-used hydrological index-based tidal flat classification methodologies, and quantitatively assessed the reliability of each index. The analysis showed that mWRI, a modification of WRI, exhibited higher reliability than other indices. MBWI, with a threshold value close to the standard, demonstrated excellent tidal flat classification performance and is expected to effectively identify tidal flats with minimal researcher intervention across various environments. As remote sensing is effective in accessing restricted areas and efficient in terms of cost and time, it complements field surveys which are useful for accurately determining the maximum extent of tidal flats. Therefore, integrating it with legal survey data, which has a relatively long production cycle and lacks data in some areas, is expected to maximize its advantages.

Keywords
Tidal flats
Remote sensing
GIS
Hydrological indices
WRI
MBWI
MNDWI
AWEI

이 연구는 황해안 내 경기만 북부지역의 원격탐사 기반 간석지 식별을 대상으로 수문지수의 활용성을 분석했다. 원격탐사는 조사 주기가 짧고 비용효율적이며, 접근성이 제한된 지역의 현황을 파악하는 데 적합하여 현장조사의 대안으로 인식된다. 황해안은 탁도가 높아 간석지와 수면을 구별하기 어려워, 원격탐사를 통한 간석지 분류에 앞서 방법론의 신뢰도를 검토할 필요가 있다. 이 연구는 전세계적으로 폭넓게 활용하는 수문지수 기반의 간석지 분류 방법론(MNDWI, WRI, MBWI, AWEI)을 비교하고, 각 지수의 신뢰도를 정량적으로 검토하였다. 분석 결과, 이 연구가 제안한 mWRI는 다른 지수들보다 높은 신뢰도를 보였다. MBWI는 기준값에 가까운 임계치로 우수한 간석지 분류 성능을 보여, 다양한 환경에서 연구자 개입을 최소화하고 간석지를 식별하는 데 효과적일 것으로 판단된다. 원격탐사는 조사 주기가 짧고 비용효율적이며 접근성에 제약이 큰 지역의 정보를 파악하는 데 효과적이므로, 간석지의 최대 범위를 정확하게 산정하는 데 유용한 현장조사와 상호 보완적이다. 따라서 정확도가 높지만 제작주기가 상대적으로 길고 일부 지역의 자료가 부재한 정부 조사자료와 통합함으로써 그 장점을 극대화할 수 있을 것으로 기대된다.

키워드
갯벌
원격탐사
GIS
WRI
MBWI
MNDWI
AWEI
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Information
  • Publisher :The Korean Geographical Society
  • Publisher(Ko) :대한지리학회
  • Journal Title :Journal of the Korean Geographical Society
  • Journal Title(Ko) :대한지리학회지
  • Volume : 59
  • No :3
  • Pages :369-384
  • Received Date : 2024-05-08
  • Revised Date : 2024-06-11
  • Accepted Date : 2024-06-17
  • DOI :https://doi.org/10.22776/kgs.2024.59.3.369
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