THE EFFECTIVENESS OF STRUCTURAL OF COASTLINE PROTECTION AT ESTUARY OF BATANG KAMBANG, WEST SUMATRA

Istijono , Bambang Istijono and Musri, Ali and Yuhendra, Rahmad (2013) THE EFFECTIVENESS OF STRUCTURAL OF COASTLINE PROTECTION AT ESTUARY OF BATANG KAMBANG, WEST SUMATRA. In: The 4th HATHI International Seminar, 6-8 September 2013, Jogyakarta, Indonesia.

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Abstract

To observe changes of shoreline and the effectiveness of structural coastline protection require the comparison and responses of the coast itself. To identify and to predict the dynamics of the coastline had been analysed by SMS (Shoreline Modelling System) and has been developed by CERC (Coastal Engineering Research Center), US Army Engineers Waterways Experiment Station. Existing condition simulated to analyse of 10 years record of wave data for the original shoreline and structural to see the effectiveness of protection each year. The original condition of the model had shown the changes of shoreline at estuary affected by the wave and structural designed by groyne and revetment indicated siginificantly protect of shore erosion. Wave transformation model result for wave direction come from southwest and the wave after transformation at groyne is around 2.5 – 3.0 m height and 5.04 m at sea. Shoreline at northern part of estuary Batang Kambang River has been eroded and affected by the groyne construction at southern part. If there are no paralel construction for groyne between the old and the new estuary of Batang Kambang River it will give dramatically impact of erosion. The effectiveness of groyne construction give a new treatment for the shoreline and need special maintenance for sand nourishment if the segment of the shore is not comprehensively constructed. Keywords: shoreline modelling system, erosion, groyne, revetment

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