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Morphological Linkages between Baeksajang Beach and Sand Spit, Anmyeondo, Korea(2014-2025)

충남 안면도 백사장 해빈과 사취 지형 변화의 연계성(2014-2025)

Chan Woong Kima*
김 찬웅a*
aDirector, Coastal Spatial Research Division, Marine Policy Research Department, Korea Maritime Institute
a한국해양수산개발원 해양연구본부 연안공간연구실장
*cwkim@kmi.re.kr
30 September 2026. pp. 289-304
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Abstract

This study examined morphological linkages between Baeksajang Beach and an adjacent sand spit on Anmyeondo, Korea, using survey data from four transects, including one crossing the spit, aerial photographs, and empirical orthogonal function(EOF) analysis. Beach width and cross-sectional area both increased at the spit, whereas only beach width increased at its proximal part; both decreased in the central and southern sectors. Aerial photographs showed that the spit migrated eastward while growing and merging but remained largely stable after 2020. EOF analysis identified opposing spatial patterns in beach-width mode 1 and cross-sectional-area mode 2, and coherent overall patterns in beach-width mode 2 and cross-sectional-area mode 1. The annual rate of increase in cross-sectional area at the spit transect corresponded to approximately 66% of the combined annual rate of decrease at the beach transects. Collectively, these results suggest possible sediment exchange between the two landforms. Since 2023, however, beach decreases have not been accompanied by clear spit growth. Cumulative storm-wave energy was significantly related only to the magnitude of beach-width change, while the width-area correlation was significant only at the southern transects, where ridges and runnels were weakly developed. Cross-sectional area therefore appears to reflect sediment exchange between the beach and spit, whereas beach width appears to reflect ridge-and-runnel behavior.

Keywords
Coastal landforms
sand spit
empirical orthogonal function
sediment exchange
Yellow Sea

본 연구는 충남 안면도 백사장 해빈과 사취 지형 변화의 연계성을 규명하기 위해, 사취를 가로지르는 측선을 포함한 4개 측선의 측량자료(해빈 폭과 단면적) 분석, 항공사진 분석, 경험고유함수 분석을 실시하였다. 분석 결과 사취는 두 지표 모두 증가, 사취 시작부는 해빈 폭만 증가, 해빈 중앙과 남측은 모두 감소하였다. 항공사진에서 사취는 성장･결합하며 동쪽으로 이동하였으나, 2020년 이후에는 큰 변화 없이 유지되었다. 경험고유함수 분석 결과 상반되는 구조(해빈 폭 제1주성분, 단면적 제2주성분)와 전반적 증감 구조(해빈 폭 제2주성분, 단면적 제1주성분)가 관찰되었다. 해빈 측선들의 연간 단면적 감소율 합계 대비 사취 측선의 증가율은 약 66%였으며, 분석 결과를 종합하면 두 지형 간 퇴적물 교환 가능성을 시사한다. 한편 누적 폭풍 파랑에너지는 해빈 폭 변화의 크기와만 유의한 관계를 보였으며, 해빈 폭과 단면적의 상관은 릿지와 런넬이 미약한 해빈 중앙과 남측에서만 유의하였다. 백사장 해빈의 단면적 공간 구조는 해빈-사취 간 퇴적물 교환의 경계를, 해빈 폭은 릿지-런넬 거동의 구배를 반영하는 것으로 보인다.

키워드
해안 지형
사취
경험고유함수
퇴적물 교환
황해
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Information
  • Publisher :The Korean Association of Professional Geographers
  • Publisher(Ko) :국토지리학회
  • Journal Title :국토지리학회지
  • Journal Title(Ko) :THE GEOGRAPHICAL JOURNAL OF KOREA
  • Volume : 60
  • No :3
  • Pages :289-304
  • Received Date : 2026-08-31
  • Revised Date : 2026-09-13
  • Accepted Date : 2026-09-15
  • DOI :https://doi.org/10.22905/kaopqj.2026.60.3.8
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