경험고유함수를 이용한 후정해수욕장 단기 모래 이동 분석

국문 초록 (Abstract)

후정해수욕장의 모래 이동을 분석하기 위해 경험고유함수(Empirical Orthogonal Function; EOF) 분석법을 적용하였다. EOF 분석을 위해 2009년 6월부터 2010년 5월까지 13개 기선에 대해서 총 5회 실시된 후정해수욕장의 단면 관측값이 사용되었다. 13개 단면 분석결과 사이의 시간적, 물리적 일관성을 확보하기 위해 13개 기선 모두를 하나로 통합하고 이를 사용해 EOF 분석을 수행하였다. 분석결과 첫 번째 고유함수는 평균해빈 지형을 나타내었으며 두 번째와 세 번째 고유함수의 경우 해빈의 자연변동성과 파랑에 의해 발생된 횡방향 모래이동을 각각 나타내었다. 네 번째와 다섯 번째 고유함수의 경우 특별한 연관성을 발견할 수 없었다. 결론적으로 후정해수욕장의 모래 이동에 영향을 미치는 요인은 크기 순으로 자연변동성과 파랑에 의한 횡방향 모래이동으로 분석 되었다.

다국어 초록 (Multilingual Abstract)

EOF (Empirical Orthogonal Function) analysis is applied to investigate the sand movement in Hujeong Beach. For the analysis, the profile data which were observed five times from June 2009 to May 2010 along the 13 baselines were used. To secure the temporal and physical consistency among the 13 profile data, the 13 profile data were combined into one data and using this data the EOF analysis was performed. According to the analysis, the first EOF is related with the mean topography and the second EOF represents the natural variation of sediment migration and the third EOF is related with the along-shore sediment transport arising from storm. The remaining EOFs show no special relation with wave conditions. In conclusion the main factors which are having great effects on Hujeong Beach's sand movement are analyzed as natural variation and along-shore sediment transport owing the wave conditions.

참고문헌 (Reference)

1 Medina, R., "Three-mode principal component analysis of bathymetric data, applied to “Playa de Castilla” (Huelva, Spain)" ASCE 1 : 2265-2278, 1992

2 Pruszak, Z., "The analysis of beach profile changes using dean’s method and empirical orthogonal functions" 19 (19): 245-261, 1993

3 Aubrey, D. G., "Statistical and dynamical prediction of changes in natural sand beaches" University of California 1978

4 Larson, M., "Shortand long-term responses of beach fills determined by eof analysis" 125 (125): 285-293, 1999

5 Cheon, S.-H., "Short-term beach change analysis at hu-jeong beach using empirical orthogonal functions" 558-562, 2013

6 Aubrey, D. G., "Seasonal patterns of onshore/offshore sediment movement" 84 (84): 6347-6354, 1979

7 Clarke, D., "Low-frequency changes of sediment volume on the beachface at warilla beach, new south wales, 1975-1985" 79 (79): 189-211, 1988

8 Berek, E., "Field investigation of longshore transport distribution" ASCE 1 : 1620-1639, 1982

9 Muñoz-Pérez, J. J., "Evolution of longshore beach contour lines determined by eof method" 65 (65): 393-402, 2001

10 Winant, C. D., "Description of seasonal beach changes using empirical eigenfunctions" 80 (80): 1979-1986, 1975

11 Clarke, D. J., "Description of littoral, alongshore sediment movement from empirical eigen-function analysis" 29 (29): 327-341, 1982

12 Liang, G, "Complex principal component analysis of wave-like sand motions" ASCE (1991) : 2175-2186, 1991

13 Dean, R., "Coastal processes with engineering applications" cambridge university press 2002

14 Dick, J. E, "Coastal changes at Bethany Beach, Delaware" ASCE 1 : 1650-1667, 1984

15 Bosma, K. F, "Beach profile analysis around Indian River inlet, Delaware, USA" ASCE 1 : 2829-2842, 1996