Economic Evaluation of Power Waves at the Beach Tegal

Observations of electric power of the waves hitting beach Tegal is obtained by finding the value of the speed, frequency and height of the waves on the beach Tegal. The average value of the wave velocity of 0.15 m/s, the average frequency of 0.17 Hz and a maximum height of 0.6 m on average. This data is still too low to generate electrical power from the mechanical power of the waves. We are still conducting research to increase the speed and height of the waves with a method of "Tapered Channel". This method is expected to raise the value of the wave height of 0.5 m to 2.2 m. Waves of electrical power is estimated to rise to 15.4 Watt/m2 25-50 Watt/m2.In economic calculation, the power of the waves starting from the value of the wave power per m2 per 4 m2. If we need a 100 Watt power of the waves, the beach area that required 4 m2. Economic development beach with waves generate electrical power, built outside the port area, so that the fishermen keep doing the fishing business as it should be. Based on the results of research in theory, the power of the waves is the speed of the wave function that describes the linear curve. However, the results of research that has been done show that the power of the waves is a function of the speed of the waves, which described as a hyperbolic curve. Wave power increases with increasing speed of the waves. While the formulation used is the wave velocity is a function of the height of the waves. By using the method of "Tepered Channel" to catch a wave, the wave speed will be higher. The results of economic research to generate electrical waves can be calculated byeconomic aspects of the compute power of the waves and technological aspects by counting the frequency of the waves


aBstraCt
Observations of electric power of the waves hitting beach Tegal is obtained by finding the value of the speed, frequency and height of the waves on the beach Tegal. The average value of the wave velocity of 0.15 m/s, the average frequency of 0.17 Hz and a maximum height of 0.6 m on average. This data is still too low to generate electrical power from the mechanical power of the waves. We are still conducting research to increase the speed and height of the waves with a method of "Tapered Channel". This method is expected to raise the value of the wave height of 0.5 m to 2.2 m. Waves of electrical power is estimated to rise to 15.4 Watt/m 2 25-50 Watt/m 2 .In economic calculation, the power of the waves starting from the value of the wave power per m 2 per 4 m 2 . If we need a 100 Watt power of the waves, the beach area that required 4 m 2 . Economic development beach with waves generate electrical power, built outside the port area, so that the fishermen keep doing the fishing business as it should be. Based on the results of research in theory, the power of the waves is the speed of the wave function that describes the linear curve. However, the results of research that has been done show that the power of the waves is a function of the speed of the waves, which described as a hyperbolic curve. Wave power increases with increasing speed of the waves. While the formulation used is the wave velocity is a function of the height of the waves. By using the method of "Tepered Channel" to catch a wave, the wave speed will be higher. The results of economic research to generate electrical waves can be calculated byeconomic aspects of the compute power of the waves and technological aspects by counting the frequency of the waves.

Keywords: Blue economic concept on the area of beach; Electric power from wave of sea; Wave power on beach.
| VOL 6, NO. 1, DEsEMBEr 2016; 1-6 JURNAL SAINS

INtrODUCtION
In the beginning, we are interested in the economic development of the concept of the blue coastal regions because this area consists of land and Ocean Beach. There are natural phenomena that occur in the sea i.e. The energy waves reach the coast and windy. The wind is blowing from the land out to sea at night and the wind blows from the sea to the land during the day. The wind blows from high pressure to low pressure. Ocean surface waves is influenced by surface wind. Research has been carried out and focused on shallow water waves in coastal areas. The purpose of this study is to know the power of the waves to the shore. These data is used to calculate the electrical power generated from waves of mechanical power. Research findings in the form of electric power value of ocean waves, were evaluated to obtain the blue economy concept in coastal areas.

Place and time of study
The first study to obtain data waves on the beach Tegal was conducted from June -September 2010 during the hours 11:00 to 13:00 pm. The second study at the beach Tegal was conducted in Friday, July 13, 2012 at 14:25 to 15:30 pm. The third was conducted on Friday, dated March 1, 2013 at 16:00 to 16:30 pm.

Frequency and Height of the waves
The first time, we define a point on the sea coast, which is a representative conditions for calculating the frequency and wave height. At that point,

Speed of Waves
Measurement of wave velocity (v), there are two types of wave speed that moves vertically and horizontally. The rate of vertical wave done by recording the number of wave in a given time interval and amplitude of wave at one point scale piles. The rate of the waves horizontally by measuring the number of waves on a specific time interval and amplitudonya on two points of scale piles. For shallow water, wave speed can also be obtained by measuring the h (the depth of the sea waters where wave propagates). Wave speed calculated using the equation: v =√gh , where g is the gravitational acceleration of the Earth. Determine the speed of the waves at one point, we call vertical speed: v=2πfh

Wave Power
Energy (perunit area) of a sinusoidal wave depends on the density ρ, the gravitational ac-   For ocean areas with an area of 1 square kilometer, if we take the assumption of no state grain waves. 1 in Table 5.1, the energy of ocean waves to generate electricity: P = 22.6 kW/km If a set of wave power plant to cost Rp. 5,000,000.00 (five million dollars), then for 1000 sets of wave power plant will cost Rp. 5,000,000,000.00 (five billion rupiahs). While the selling price per 1 kWh electricity is Rp. 793.00 (seven hundred and thirty three rupiahs). Thus in point 1 In Table 1 obtained in item 1-3. wave height 0.3 m -0.5 m. If this study used methods tapered channel, the data obtained in Table 4, from a height of 0.5 m to 2.2 m height. We note that the power generated in Table 3.

CONCLUsION
The power of wave is a linear function of wave speed. This research shows that the power of wave is a hyperbolic curve. This means following the formulation of wind power which is a function of the cube of the wind speed. Two factors are used in the economic evaluation and technology. The power and frequency of waves on coastal area. These two parameters will be used in planning tool of wave energy conversion into electrical energy.