Jepara government took the initiative to construct submerged breakwaters to reduce wave force. Development planning of submerged breakwater need to analyze the reduction of wave spectrum (H and T) around the breakwaters. On this research we applied two variances of structure. Analysis of wave spectrum used 2D hydro-dynamic mathematical model. Data that has been used for input model there are bathymetry data, wind data along 2009-2019, tide data, and coastline data. Wave height and wave period data was obtained by wind data along 2009-2019 which was calculated using DNS method. Model simulation of wave height and period applied in two formation at 5 wind direction (North, Northeast, East, Southeast, and South). Effectiveness is known by the changes of Hmax and T while passing the structure. Based on simulation model, highest wave height found during southeast wind and reduced after passing the breakwaters. Breakwaters with 4 structure (formation 2) has higher reduction percentage...

中文翻译：

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Jepara Panjang岛基于波谱变化的淹没防波堤有效性

杰帕拉政府主动建造水下防波堤，以减少波浪力。水下防波堤的发展规划需要分析防波堤周围波谱（H和T）的减少。在这项研究中，我们应用了两个结构差异。使用2D流体动力学数学模型分析波谱。用于输入模型的数据包括测深数据，2009-2019年的风力数据，潮汐数据和海岸线数据。波浪高度和波浪周期数据是通过使用DNS方法计算的2009-2019年沿风数据获得的。在5个风向（北，东北，东，东南和南）的两个地层中应用的波高和周期的模型模拟。通过结构时Hmax和T的变化可知有效性。根据仿真模型，在东南风中发现的最高波高，在通过防波堤后降低。具有4种结构（形式2）的防波堤的还原百分比更高...