Untitled - Teknik Kelautan / ITB
Untitled - Teknik Kelautan / ITB
Untitled - Teknik Kelautan / ITB
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Coastal Oceanographic Modelling Studies of Coastal Erosion<br />
Problem Along The Coast of Indramayu-Cirebon<br />
Fitri Suciaty, Titri Yan Rizki<br />
PT. ASR Ltd.<br />
Kantor Taman A9, Lantai 5, Unit D<br />
Jalan Mega Kuningan Lot 8,9/A9, Jakarta Selatan<br />
Email : fitri@asr.co.id<br />
Abstract. Coastal areas of Indramayu and Cirebon are known for the significant<br />
erosion. Based on records in Departement of Fisheries and Marine Resources<br />
(Diskanla) Indramayu, the latest data in 2007 said, the coast had been eroded 42,6<br />
km. Understanding the pattern of sediment distribution and transport due to wave<br />
and current conditions during each seasons are important for coastal erosion<br />
mitigation measures. This study is conducted to understand the sediment circulations<br />
patterns and to determine the coastal erosion and sedimentation pattern along the<br />
coastal areas of Indramayu and Cirebon, especially around the Eretan and Balongan<br />
coast where the Pertamina gas pipelines, port and navigational channel stands. Three<br />
types of hydro-oceanographic modelling are carried out in this study, ie. modeling of<br />
wave propagation and wave generated currents (wave driven current), the<br />
hydrodynamic modeling of ocean tides, and sediment transport modeling. Hydrooceanographic<br />
modelling on this study are simulated by 3DD Suite Model (Black,<br />
1996). Simulations performed for the data in Januari 2011 to represent west<br />
monsoon condition and data in August 2011 to represent east monsoon condition.<br />
WBEND of 3DD Suite Model used to simulate wave propagation in the regional<br />
scale of dominant wave directions. While the currents generated by waves in the<br />
coastal areas and the potential of sediment transport are simulated using 2DBEACH<br />
beach circulation and sediment transport of 3DD Suite Model.Hydrodynamic model<br />
simulation result shows that current circulation are influenced by seasonal<br />
conditions. Dominant currents flow westward/northwestward at ebb tide to lowest<br />
water condition, and then change direction to eastward/southeastward at flood tide to<br />
highest water conditions. West monsoon causes the velocity of current increase at<br />
low tide, while the east monsoon at high tide causes current velocity increase. This<br />
current pattern which are influenced by the monsoonal seasons causes the dynamics<br />
of erosion at Indramayu and Cirebon coastal areas. The dynamics of the erosion<br />
process further can also be seen from the results of wave propagation and sediment<br />
transport simulations.<br />
Keywords : erosion, current, wave, sediment transpor, monsoon.<br />
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