한반도 서해안의 대조차 파랑-우세 신두리 만에서 관찰되는 급격한 표층퇴적상 변화와 퇴적학적 특성 = Rapid shift of surface sedimentary facies and its depositional mechanism in the macrotidal wave-dominated Sinduri Bay, west coast of Korea

국문 초록 (Abstract)

한반도 서해안 태안반도의 서측에 위치하는 신두리만은 외측의 파랑우세 사질 조간대와 조수해빈이 발달하며 이들은 직선형의 해안선과 표층퇴적물의 대부분이 분급이 매우 좋은 중립-세립의 모래로 구성되어 있다. 해안선과 수평한 방향으로 연속적으로 발달하는 3-4줄의 스워시바(swash bar)가 사질 조간대의 형성에 가장 중요한 역할을 한다. 평행한 층리와 파랑 연흔 사층리가 교호하는 수직퇴적상이 우세하다. 신두리만 남측 만입지역의 표층퇴적물은 입구로부터 모래함량이 점차 감소하여 혼성 조간대에서 니질 조간대 퇴적상으로 전이하는전형적인 만입형 조간대 퇴적층의 형태를 보인다. 니질 조간대의 경사는 매우 완만하고 오목한 형태이며, 생교란이 심한 니퇴적상이 우세하다. 신두리 만은 한반도 서해안에 발달하는 대표적인 대조차 파랑우세 해빈으로인식되어 왔지만 하나의 좁은 지형단위 내에서 파랑우세 연안퇴적환경(사질 조간대와 조수해빈)과 조류우세연안퇴적환경(니질 조간대)이 인접하여 나타나는 퇴적학적 특성을 가진다. 단일한 지형단위 내에서 표층퇴적상, 수직퇴적상과 지질특성이 매우 상이한 소퇴적환경이 동시에 존재하는 원인은 지형적 특성 및 부유퇴적물공급과 퇴적역학적 특성이 복합적으로 작용한 결과이다.

다국어 초록 (Multilingual Abstract)

Wave-dominated sandflat and tidal beach formed in the north of Sinduri Bay, Taean Peninsula of Korea have a nearly straight shoreline, which consist of very well sorted medium to fine sand in surface sediment.
Three to four lines of swash bar, which are parallel to the coastline and continuously migrating landward and, play the most important role in the formation of the sandflat. Parallel lamination and wave-ripple cross lamination are predominantly preserved sedimentary structures in short cores. The embayed area of the south of the bay consists mostly of mud in surface sediment, showing a gradual decrease in sand content from the entrance to the bay-head area. A typical transition from mixed-flat to mud-flat facies occurs in this embayed intertidal flat area. The mud flat is very gentle in slope with slight concave-up profile and shows a dominant bioturbated mud facies (Facies Mb) in its vertical facies. The coastal environment of Sinduri Bay has been recognized as one of the macrotidal wave-dominated beach in the west coast of the Korea. However, it has the sedimentological characteristics which both wave-dominated (sand flat and tidal beach) and tide-dominated (mud flat) coasts occur very closely within a small single geomorphological unit. The co-occurrence of sub-environments having different surface and vertical facies and geologic character in such a single geomorphological unit can be indicative of one of characteristics in the macrotidal open-coast depositional environment. This may be the combined result of geomorphologic characteristic, supply of suspended sediment and hydrodynamic condition.

참고문헌 (Reference)

1 홍성찬, "홀로세 중기 이후 신두리 해안사구의 성장 : 기후변화 및 해수면 변동과의 관련 가능성" 한국지형학회 17 (17): 87-98, 2010

2 류상옥, "한반도 서해남부 임자도 해빈 퇴적작용의 계절적 변화" 한국해양학회 9 (9): 83-92, 2004

3 강솔잎, "한국 서남해안 고창 해빈의 표층 지형 변화 특성" 한국지구과학회 36 (36): 533-542, 2015

4 신영호, "신두 해양생태계보호구역 해빈과 조하대의 퇴적물 특성" 대한지리학회 49 (49): 812-832, 2014

5 소광석, "고창군 명사십리 조간대 표층 퇴적물의 계절 변화" 한국해양학회 14 (14): 181-188, 2009

6 Yang, B. C., "Up-Estuary Variation of sedimentary facies and ichnocoenoses in an open-mouthed, macrotidal, mixed-energy estuary, Gomso Bay, Korea" 77 : 757-771, 2007

7 Yang, B. C., "Transgressive sedimentation and stratigraphic evolution of a wave-dominated macrotidal coast, western Korea" 235 : 35-48, 2006

8 Chang, J. H., "Tidal-flat sedimentation in a semi-enclosed bay with erosional shorelines: Hampyung Bay, West Coast of Korea" 4 : 117-126, 1999

9 Masselink, G., "The effect of tide range on beach morphodynamics and morphology : A conceptual beach model" 9 : 785-800, 1993

10 Frey, R. W., "Sediments and sedimentary sequences on a modern macrotidal flat, Inchon, Korea" 59 : 28-44, 1989

11 Chun, S. S., "Sedimentological implications of vertical and lateral facies changes in the modern, non-barred macrotidal flats of the west coast of Korea" 151 : 16-18, 1992

12 Oh, J. K., "Sedimentologic characteristics of macrotidal beach in Mongsanpo, west coast of Korea" 19 : 310-317, 1998

13 Yang, B. C., "Sedimentation on a wave-dominated, open-coast tidal flat, south-western Korea : summer tidal flat-winter shoreface" 52 : 235-252, 2005

14 Chun, S. S., "Sedimentation and Holocene evolution of wave-dominated, macrotidal-flat depositional system in the southwestern open coasts of Korean Peninsula" 58 : 65-83, 2004

15 Reading, H.G., "Sedimentary Environments: Process, Facies and Stratigraphy" Blackwells 154-231, 1996

16 Song, W., "Sediment distribution circulation and provenance in a macrotidal bay: Garolim Bay, Korea" 52 : 121-140, 1983

17 Chu, Y. S., "Seasonal variations of beach sedimentation in the middle-western coast of Korea" 18 : 37-45, 1996

18 Ryu, S. O., "Seasonal variation of sedimentary processesin a semi-enclosed bay : Hampyong bay, Korea" 56 : 481-492, 2003

19 Ryu, S. O., "Seasonal cycle of sedimentary process on mesotidal flats in the semi-enclosed Muan Bay, southern west coast of Korea : culminating summertime erosion" 24 : 137-147, 2004

20 Chang, J. H., "Seasonal accumulation pattern and preservation potential of tidal-flat sediments: Gomso Bay, west coast of Korea" 3 : 149-157, 1998

21 Kim, S. R., "Sea-bottom sediments and seafloor acoustic image by side scan sonar on Sindu-ri offshore" 23 : 707-721, 2002

22 Bartholoma, A., "Progressive grain-size sorting along an intertidal energy gradient" 202 : 464-472, 2007

23 Flemming, B. W., "Principles of tidal sedimentology" Springer 231-267, 2012

24 Gao, S., "Net sediment transport patterns inferred from grain-size trends, based upon definition of “transport vectors”" 81 : 47-60, 1992

25 Chang, T. S., "Mud deposition on a macrotidal beach: Dasari coastal dune, west coast of Korea" 75 (75): 1312-1316, 2016

26 Wells, J. T., "Morphology, sedimentology and tidal channel processes on a high tide range mudflat, west coast of south Korea" 95 : 111-130, 1990

27 Lee, H. J., "Landward migration of isolated shelly sand ridge(chenier)on the macrotidal flat of Gomso Bay, West coast of Korea : Controls of storms and typoon" 64 : 886-893, 1994

28 Boyd, R., "Facies models revisited" 171-235, 2006

29 Kim, D. H., "Explanatory text of the geological map of Daesan-Eigog sheet (1:50,000)" Korea Institute of Enerty and Resources 27-, 1982

30 Flemming, B. W., "Encyclopedia of Coastal Science. Encyclopodia of Earth Science Series" Springer 1180-1185, 2005

31 Ryu, S. O., "Distribution pattern and characteristics of the surface sediments in Hampyong Bay, the southwestern coast of Korea" 18 : 367-378, 1997

32 Boersma, J. R., "Distinguishing features of wave-ripple cross-stratification and morphology" University of Utrecht 1970

33 Oh, J. K., "Depositional processes in transitional zone between coast and offshore area off the Taean peninsula" 20 : 476-485, 1999

34 Oh, J. K., "Depositional environments and characteristics of surface sediments in the nearshore and offshore off the mid-western coast of the Korean peninsula" 22 : 377-387, 2001

35 Baek, Y. S., "Depositional characteristics and seasonal change of surface sediment and sedimentary structure on the Doowoori tidal flat, Southwestern coast of Korea" 10 : 10-17, 2004

36 Reineck, H.E., "Depositional Sedimentary Environment" Springer-Verlag 430-, 1980

37 Hong, S. H., "Contrasting sedimentation patterns in two semi-enclosed mesotidal bays along the west and south coasts of Korea controlled by their orientation to the regional monsoon climate" 37 : 385-395, 2017

38 Davies, Jr. R. A., "Coastal Sedimentary Environments" Springer-Verlag 716-, 1985

39 Fan, D., "Classifications, Sedimentary features and facies associations of tidal flats" 2 : 66-80, 2013

40 Boyd, R., "Classification of clastic coastal depositional environment" 80 : 139-150, 1992

41 Harris, P. T., "Classification of Australlian clastic coastal depositional environments based upon a quantitable analysis of wave, tidal, and river power" 72 : 858-870, 2002

42 Allen, J. R. L., "Changes in intertidal dunes during two spring-neap cycles, Lifeboat Station Bank, Wells next the Sea, Norfolk(England)" 23 : 329-346, 1976

43 Dalrymple, R. W., "Bedforms and their hydraulic stability relationships in a tidal environment, Bay of Fundy, Canada" 275 : 100-104, 1978

44 Yang, B. C., "A seasonal model of surface sedimentation on the Baeksu open-coast intertidal flat, southwestern coast of Korea" 5 : 251-262, 2001