Abstract
Wave energy is being increasingly regarded in many countries as a major, promising and renewable resource. This paper presents the development of slope coastal protection as a wave energy converter by capturing sea water into the reservoir through overtopping process. Physical models simulation were conducted at The Laboratory of Coastal Engineering, Hasanuddin University. A model of 30 cm x 90 cm in the 30° degree of slope made from acrylic material equipped with a reservoir at the top surface of the structures to catch seawater through run up and overtopping. Models were simulated with various wave high and periods as well as high of freeboard. The results showed that the overtopping discharge (Q) much influenced by relative freeboard height (Fb/d), wave steepness (Hi/L), reflected waves (Kr) and the number of standing waves (Nsw). The increasing Fb, the decreasing Q; the increasing wave steepness, the increasing overtopping discharge. It was found that the larger the reflection coefficient, the greater the discharge overtopping. Standing waves in front of the structure due to the superposition of the incident wave and reflection waves also contribute to enlarge the overtopping discharge.
Highlights
Wave energy is a type of well-concentrated renewable energy when compared to other renewable energy resources, such as solar, wind etc., and it has a huge potentials
Overtopping devices are partially submerged wave energy converter equipped by reservoirs for capturing wave crests and water turbines to produce electricity
From the above finding equation, the overtopping discharge (Q) can be determined and the head (h) such described in Figure 1 founded from experiment than the wave power in the reservoir can be determined in the consideration of the efficiency of the turbine
Summary
Wave energy is a type of well-concentrated renewable energy when compared to other renewable energy resources, such as solar, wind etc., and it has a huge potentials. In the second conversion stage, a power take-off system, such as hydraulic pump/motor, direct electrical generator, air turbine or water turbine (depending on the principle of the wave energy converter), is often applied to convert the mechanical/potential energy into useful energy [6]. Overtopping devices are partially submerged wave energy converter equipped by reservoirs for capturing wave crests and water turbines to produce electricity. Due to the low cost and swiftness of empirical formulas, these are more used to estimate wave overtopping discharge They are limited for a small number of geometries. Among the few WECs that have been built and tested is the Norwegian TAPCHAN (Tapered Channel) This device is equipped with the same machinery as a low pressure hydroelectric power station with a reservoir and a Kaplan turbine. This paper focuses the discussion on overtopping devices, and the advantages of overtopping devices compared to the other type
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