Impact of a Proposed Pier on Tidal Currents:Koa Kood Island, Thailand

The impact of a proposed pier on tidal current alteration was evaluated. The proposed pier location was in Salad Bay on Koa Kood Island, Trat province, Thailand, and was designed to accommodate passenger ships with a draft of less than 2 m. The study began with collecting necessary data, including bathymetric, water elevation and tidal current characteristics. The impact was assessed using a software package (MIKE21). Although the results showed that the pier would affect the existing current pattern, the change was determined to be insignificant, as the design of the piles for the pier provided sufficient spacing to let the current flow as freely as possible. Consequences of the altered current, such as seabed erosion, water stagnation, sediment deposition and navigational risk were assessed. Environmental mitigation measures might be necessary if the impacts were considered unacceptable.

Authors:

• Cherdvong Saengsupavanich

Keywords:

• Environmental impact assessment
• pier
• tidal currentchange
• coastal engineering and management

References:

[1] O. C. Saengsupavanich, S. Chonwattana, T. Naimsampao, "Coastal
erosion through integrated management: A case of Southern Thailand,"
Ocean & Coastal Management, vol. 52, pp. 307-316, 2009.
[2] A. Lamberti, B. Zanuttigh, "An integrated approach to beach
management in Lido di Dante, Italy," Estuarine, Coastal and Shelf
Science, vol. 62, pp. 441-451, 2005.
[3] B.M. Sumer, J. Fredsoe, The mechanics of scour in the marine
environment, Advanced series on ocean engineering, volume 17.
Singapore: Uto-Print, 2002.
[4] H. Agerschou, H. Lundgren, T. Sorensen, T. Ernst, J. Korsgaard, L.R.
Schmidt, W.K. Chi, Planning and design of ports and marine terminals.
Norwich: Page Brothers Ltd., 1985.
[5] American Society of Civil Engineers, Planning and design guidelines for
small craft harbor, ASCE manuals and reports on engineering practice,
no 50. New York: ASCE., 2000.
[6] C. Saengsupavanich, "A current environmental impact assessment of a
port in Thailand: Marine physical aspects;" Ocean & Coastal
Management, vol. 54, pp. 101-109, 2011.
[7] U.S. Army Corps of Engineers, Coastal Engineering Manual, 2006.
[8] J.R. Clark, Coastal zone management handbook. USA: Lewis
Publishers, 1996.