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Article

Distribution and Mid- to Long-Term Grain-Size Changes of Surface Sediments along The Mesotidal Coast of Songho Beach on the Southwestern Coast of Korean Peninsula

한반도 서남해안 중조차 송호해빈 연안에서 표층퇴적물의 분포와 중장기적 입도변화

MYUNG SUN LEE1*
,
JIN HO CHANG2
이 명선1*
,
장 진호2
1Graduate Student, Department of Marine Fisheries Resources, Mokpo National University, Jeonnam 58554, Korea
2Professor, Department of Marine Fisheries Resources, Mokpo National University, Jeonnam 58554, Korea
1국립목포대학교 해양수산자원학과 대학원생
2국립목포대학교 해양수산자원학과 교수
*Corresponding Author
28 February 2025. pp. 11-23
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Abstract

In order to reveal the sediment distribution and change characteristics in the mesotidal beach coast, surface sediments were collected from 65 stations of Songho Beach area in 2007 and 2022, and the grain size was analyzed. As a result, beach sands of the intertidal zone show the narrow and long distribution along the coast, and muds mixed with silt and clay are widely distributed in the subtidal zone of the Songho Beach area, thus showing that the inflow and movement of beach sands mainly occur along the coast. As a result of analyzing the change in sediment grain size in the Songho Beach area over past 15 years (2007-2022), in the intertidal zone where beach sand is distributed, sand content decreased (average –2.3%) and gravel content increased (average +1.6%), showing the coarsening change in mean grain size by 0.2Ø, and even in the subtidal zone, where muds are dominant, the clay content decreased (average –4.0%) and the silt content increased significantly (average +8.6%), showing the coarsening change in mean grain size by 0.3Ø. In addition, beach sand in the intertidal zone decreased on the northern coast of Songho Beach and increased the southern coast toward the western subtidal zone, indicating that beach sand moved from north to south and discharged into the subtidal zone. Silt showed a significant increase in the wide subtidal zone to the west Songho Beach and the intertidal zone to the north and south, indicating that the distribution of silt was expanding from the subtidal zone toward the intertidal beach. And clay showed a characteristic of decreasing content mainly in the subtidal zone southwest of Songho Beach. These mid- to long-term changes in sediment distribution along the coast of Songho Beach appear to have been influenced by many factors such as changes in inflow river and precipitation, increase in subtidal seaweed farm area, beach nourishment every year, changes in wave energy environment due to deformation of the southern coastline.

Keywords
Songho beach
Surface sediment
Mesotidal coast

중조차 해빈 연안의 퇴적물 분포 및 변화 특성을 밝히기 위해 2007년과 2022년에 송호해빈 연안의 65개 동일 정점에서 표층퇴적물을 채취하여 입도를 분석하였다. 그 결과 송호해빈 연안의 조간대에서는 해빈모래가 해안을 따라 좁고 길게 분포하고, 바다 쪽 조하대에서는 실트와 점토가 혼합된 펄이 넓게 분포하여 해빈모래의 유입과 이동이 주로 해안을 따라 이루어짐을 보여주었다. 송호해빈 연안에서 지난 15년 동안(2007-2022) 퇴적물의 입도 변화를 분석한 결과, 해빈모래가 분포하는 조간대에서는 모래가 감소(평균 -2.3%)하면서 자갈 함량이 증가(평균 +1.6%)하여 평균입도가 0.2Ø만큼 조립해졌고, 펄이 우세한 조하대에서도 점토 함량이 감소(평균 –4.0%)하고, 실트 함량이 크게 증가(평균 +8.6%)하면서 평균입도가 0.3Ø 정도 조립해진 변화를 보였다. 또한 조간대의 해빈모래는 송호해빈의 북측 해안에서 감소하고, 남측해안에서 서측의 조하대 방향으로 증가하는 변화를 보여 해빈모래가 북쪽에서 남쪽으로 이동하여 조하대로 유출됨을 나타내었다. 실트는 송호해빈 서측의 넓은 조하대와 북측 및 남측의 조간대에서 크게 증가하는 변화를 보여 실트 분포가 조하대에서 조간대 해빈 쪽으로 확장됨을 나타내었다. 그리고 점토는 주로 송호해빈의 남서쪽 조하대에서 감소하는 특징을 보였다. 이러한 송호해빈 연안의 중장기적 퇴적물 분포 변화는 해빈으로 유입되는 하천 및 연구지역 주변 강수량의 감소, 조하대 양식장의 면적 증가, 매년 진행되는 양빈, 그리고 남측 해안선의 변형(축제식 양식장 축조)에 따른 파랑에너지 환경의 변화 등의 영향을 받은 것으로 판단된다.

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 30
  • No :1
  • Pages :11-23
  • Received Date : 2024-07-01
  • Revised Date : 2025-01-13
  • Accepted Date : 2025-01-13
  • DOI :https://doi.org/10.7850/jkso.2025.30.1.011
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