Eko Pradjoko, Hitoshi Tanaka


The shoreline analysis around the Nanakita River mouth has been performed by utilizing aerial photographs to reveal the different behavior between left and right side of the river mouth. The shoreline on left side of river mouth has been moving more dynamically than the right side. The empirical orthogonal function (EOF) method is also applied on the shoreline data to reveal the behavior of shoreline change. The first mode of variability reflects the cross-shore movement which is shown by uniform advance and retreat movement along the beach. The shoreline change around the Nanakita River mouth is dominated by the cross-shore movement which is shown by around 80% contribution of first mode. The second mode of variability depicts the longshore sediment movement which is shown by different shoreline movement between left and right side of river mouth. The longshore movement only contributes around 10% to the shoreline change around the Nanakita River mouth. The second mode also reveals the influence of river mouth to the longshore sediment transport characterized by different shoreline response between left and right side.


aerial photograph; shoreline; river mouth; longshore sediment transport; empirical orthogonal function


Boak E.B., and I.L. Turner. 2005. Shoreline definition and detection: a review, Journal of Coastal Research, Vol. 21, No. 4, pp. 688–703.

Camfield F.E., and A. Morang. 1996. Defining and interpreting shoreline change, Ocean & Coastal Management, Vol. 32, No. 3, pp. 129-151.

Crowell M., S.P. Leatherman, and M.K. Buckley. 1991. Historical shoreline change: error analysis and mapping accuracy, Journal of Coastal Research, Vol. 7, No. 3, pp. 839-852.

Dibajnia M., R.B. Nairn, and P. Ross. 2004. Analysis of longterm sand accumulation at a harbor using 2DH numerical simulation, Coastal Engineering, 51, pp. 863-882.

Fairley I., M. Davidson, K. Kingston, T. Dolphin, and R. Phillips. 2009. Empirical orthogonal function analysis of shoreline changes behind two different designs of detached breakwaters, Coastal Engineering, Vol.56, pp.1097-1108.

Hanslow D.J. 2007. Beach erosion trend measurement : a comparison of trend indicators, Journal of Coastal Research, Special Issue 50, pp. 588-593.

Hoeke R.K., G.A. Zarillo, and M. Synder. 2001. A GIS based tool for extracting shoreline position from aerial imagery (BeachTools), Coastal and Hydraulics Engineering Technical Note, CHETNIV-37, U.S. Army Corps Engineer Research and Development Center, Vicksburg, MS.

Hunt I.A. 1959. Design of seawalls and breakwaters, Journal of Waterway and Harbors Division, ASCE, 85(3), pp. 123-152.

Kang H.W., and H. Tanaka. 2004. Monitoring of long-term shoreline evolution on Sendai coast, Proceedings of the 4th Congress of Environmental Hydraulics and the 14th Congress of APDIAHR Congress, pp.1101-1107. PMid:15674008

Khang T.T., and H. Tanaka. 2007. Effect of river mouth terrace to the continuous longshore sediment transport on Sendai coast, Journal of Coastal Research, Special Issue 50, pp. 874-878.

Kraus N.C., and J.D. Rosati. 1997. Interpretation of shoreline position data for coastal engineering analysis, Coastal Engineering Technical Note, CETN-II-39, U.S. Army Corps Engineer Coastal Hydraulic Laboratory.

Kuroiwa M., T. Kuchiish, K. Kato, S. Sunagawa, and Y. Matsubara. 2008. Applicability of coastal area model to morphodynamics around river mouth, Proceedings of 31th International Conference on Coastal Engineering, ASCE, pp. 2218-2230.

Kurosawa T., and H. Tanaka. 2001. A study of detection of shoreline position with aerial photographs, Proceedings of Coastal Engineering, Vol. 48, Japan Society of Civil Engineer, pp. 586–590 (in Japanese).

Miller J.K., and R.G. Dean. 2007. Shoreline variability via empirical orthogonal function analysis: Part 1 temporal and spatial characteristics, Coastal Engineering, 54 (2), pp. 111-131.

Moore L.J. 2000. Shoreline mapping techniques, Journal of Coastal Research, Vol. 16, No. 1, pp. 111-124.

Srivihok P., and H. Tanaka. 2004. Analysis of river mouth behavior change by using aerial photographs, Annual Journal of Hydraulic Engineering, Vol. 48, Japan Society of Civil Engineer, pp. 733-738.

Sunamura T., and K. Horikawa. 1974. Two-dimensional beach transformation due to waves, Proceedings of 14th International Conference on Coastal Engineering, ASCE, pp. 920-938.

Sunamura T. 1986. A parameter for cross-shore sediment transport direction and its application to beach erosion/accretion problem, Annual Report, Inst. Geosci., Univ. Tsukuba, No.12, pp. 52-54.

Uzaki K., and Y. Kuriyama. 2007. Numerical and field study of sediment budgets on an inter tidal flat at the mouth of the Shirakawa River, Proceedings of 5th River, Coastal and Estuarine Morphodynamics : RCEM 2007, IAHR, pp. 427-434.

Winant C.D., D.L. Inman, and C.E. Nordstorm. 1975. Description of seasonal beach changes using empirical eigen functions, Journal of Geophysical Research, 80 (15), pp. 1979-1986.

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