日本电力会社、中央研究所,研究成功两种新型,既降低建没费用,又提高性能的防波堤。今后在建设防波堤时,将采用其中的某一种。新型防波堤,是用混疑土预制的箱型结构,但与消波砌外型的防波堤不同。迄今的防波堤,上边是平面的。造价高,易磨耗,越波防止机能差。新型防波堤有两类。一是缝隙型,二是缓斜面型。 Japan Electric Power Corporation, the Central Research Institute, two successful new research, both to reduce construction costs and improve the performance of the breakwater. In the future construction of breakwater, will use one of them. The new breakwater is a box-type structure prefabricated with clay, but different from the breakwaters of the wave-elimination exterior. So far the breakwater, the top is flat. High cost, easy to wear, the more wave to prevent poor performance. There are two types of new breakwater. First, the gap type, the second is gentle slope type.