Print Email Facebook Twitter Hambantota Fishery Harbour Title Hambantota Fishery Harbour Author Everts, P.S. Julianus, E.J.B. Marijnissen, M. Voorend, S.J.M. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2014-12-09 Abstract At the southern coast of Sri Lanka a small fishery harbour is located in Hambantota. Soon after construction of the harbour in 2006 the harbour started silting up at various places. From that point onwards the harbour’s basin has been dredged multiple times, but the problem turned out to be structural. In addition breaking waves are encountered near the entrance, which makes it difficult and dangerous for the fishermen to leave and enter the harbour. This problem has led to serious injuries and a fatal accident. To aid the fishermen of Hambantota a student research project is executed to identify the causes of the harbour sedimentation and provide the government of Sri Lanka with possible solution directions to deal with this problem. The research questions are formulated as follows: Which processes are responsible for the sedimentation and harsh navigability conditions at the Hambantota Fisheries Harbour and why aren’t those processes dealt with in the existing design? Which adjustments of the current design will prevent future sedimentation inside the harbour and improve navigability conditions for the fishermen and to what extend should the different stakeholders be involved to achieve this? General understanding of the large scale processes which occur at the southern coast of Sri Lanka is important before the specific problems at Hambantota can be analysed. Therefore this research project starts with an extensive system analysis. With global knowledge of the climate, tide and the wave conditions the specific problems in Hambantota were analysed. Beside a technical analysis of the port a stakeholder analysis was conducted to find out where mistakes were made and identify lessons learned to prevent problems in the future. With improvements and learned lessons in mind possible solutions were generated and evaluated based on among others: durability, sedimentation and construction and maintenance costs. Weight factors were assigned by the Project Director Team and a multi-criteria analysis was used to find the most promising alternative. The dominant process responsible for the transport of sediment into the harbour is diffraction. With this mechanism wave energy is turned around the breakwater head and directed into the harbour. This causes a sediment flow into the harbour and the sediment settles in the harbour basin. The sediment enters the coastal cell from the western boundary where mainly fine sediment is imported around the rocky headlands. Bad navigability conditions are caused by the presence of a shoal in front of the entrance which induces wave breaking at this location. Overall the failure of the Hambantota Fishery Harbour project can be explained from bad communications between the various stakeholders. Improving the communication between the stakeholders will be essential for the adaption of the harbour to be successful. Therefore the Project Director Team should collaborate with Royal HaskoningDHV and ECL, involve the Hambantota Fisherman Association, Hambantota Fisheries Traders Association, the Harbour Manager and the Hambantota Fisheries Harbour Management Committee and consult most of the governmental stakeholders. The ‘Block’ alternative is developed which blocks the incoming sediment transport by perpendicular extensions on both breakwaters. The alongshore transported sediment is accumulated in the buffer zones created with the extensions and periodic dredging is required to maintain the function of buffer zone. A shoal can’t form since the sediment supply is interrupted, so breaking waves are no longer present. The extensions at the breakwaters not only provide a buffer zone, they also provide a sheltered area in front of the harbour entrance to enable fishermen to enter the Hambantota Fishery Harbour safely. Subject Sri LankaFishing harboursiltationDiffraction To reference this document use: http://resolver.tudelft.nl/uuid:a66fd8ad-087a-4693-84ed-951507e3f926 Publisher TU Delft, Department Hydraulic Engineering Coordinates 6.125478, 81.128237 Source Master project report Part of collection Student theses Document type student report Rights © 2014 Authors Files PDF Report_Hambantota_Fishery ... arbour.pdf 8.38 MB Close viewer /islandora/object/uuid:a66fd8ad-087a-4693-84ed-951507e3f926/datastream/OBJ/view