Breakwaters inFishery Harbours Harbours and ports use breakwaters in order to provide asafe and calm environment for the ships and boats. If the waves entering theharbour have a larger wave height and wave speed, then the vessels inside theharbour will not be safe as they can be damaged from the energy transferredfrom the waves.
That is why construction of breakwaters in harbours have muchimportance. The function of breakwater can be expressed simply as followingmanner. Breakwater acts as a barrier to the waves that tries to enter theharbour. Breakwater absorbs the most of the energy waves cary and it allowssome waves which carry lower energy. That is why the waves which passes througha breakwater carries a lesser speed and a amplitude. Which is favourablecondition for the ships harbourage. In my research I consider only the breakwater constructionin fishery harbours.
There are 19 existing fishery harbours in Sri LankanCoastal belt. And there are 10 proposed harbours. Suduwella Fishery Harbour isunder constructions.
All these fishery harbours are under the administration ofCeylon Fishery Harbour Corporation. All these fishery harbours have breakwatersas a main component. There are two main types of breakwaters used in Fisheryharbours in Sri Lanka.
1. Conventionalrubble mound breakwater2. Concretearmour breakwater ( Currently only Dikkowita fishery harbour have this type ofbreakwaters) In my research I focus on conventional rubble moundbreakwater construction in Fishery harbours as it is the most commonly usedbreakwater type. After the construction of the breakwater, the suitable waveamplitude of the harbour basin should be 2m-3m. A fishery harbour can consistof one or many breakwaters depending on the layout of the location. We have to consider the feasibility of the rubble mound breatwaterconstruction, before the project starts, as the breakwater carries the maincost component of the fishery harbour development. If the cost outweighs thebenefits of the project, we should not starts the project in the first place.
. ProblemStatement In Sri Lanka,when a fishery harbour is constructed, the major cost part belongs to theconstruction of the breakwater. Currentlythere are no specific method to calculate the total cost which will occur tobuild a conventional rubble mound breakwater. If we could provide a method toderive the rough cost of the rubble mound breakwater we are going to build,that will be very easy for the decision makers to get an idea about thefeasibility of the project. Significance ofthe research As Sri Lanka isan island which consists of a large sea coastal belt, a lot of people depend onthe fishery industry.
So the people who go fishing using the fishing boats andships must have safe harbour facilities in order to carry on their livelihoodin a proper and a safe manner. Sri Lankan coastal belt consists of so manysuitable locations for the fishery harbour constructions such as Gandara,Kalamatiya, Mulathivu etc. Ceylon Fishery Harbour Corporation may have to usethese locations in order to construct fishery harbours and provide the relevantfacilities for the people who live on fishery industry. For that they may need amethod to pre-identify the costs which may occur for financial and decisionmaking purposes. From myresearch outcomes, there will be a method to derive a “cost per unit”value for the conventional rubble mound breakwater that is going to beconstructed. Since the breakwater carries the major cost part in the fisheryharbour project, the stakeholders will be able to come up with the rough costpart for the breakwater. Scope of theStudy A study must becarried out in order to get an idea about the conventional rubble moundbreakwater design. Details must be gathered from the relevant parties likeCeylon Fishery Harbour Corporation and the companies who involve inconstructing fishery harbours in Sri Lanka.
Then a method should be derived inorder to get a “cost per unit” value for the breakwater. Second part ofthe research is to verify the outcome ofthe research. Details of the completed breakwaters must be obtained fromrelevant parties and compare the research result with the actual cost values. Then necessary corrections must be taken forthe research outcome. Aims andObjectives of the research 1.
Learnthe design of rubble mound breakwater which is used in fishery harbours in SriLanka.2. Identifythe materials and costs related to the construction of a breakwater.3. Dataanalysis in order to derive a “cost per unit” value for a breakwater.
4. Verificationand summarization of the outcomes of the research.