The Comparative Study On The Effective Width Of Breakwater Gap Between In China And Abroad

The layout of the port entrance is very important in port planning. A smoother surface of the port waters can be provided for ships by a reasonable design of bearing, position, width and direction. The effective width of breakwater gap is related to the process of entering and leaving the port. And it is based on the scale forecasting in recent time and in future, the amount of ship in and out the port, DWT of ships, conditions of nature and so on. Through analyzing and comparing designing standards of effective width in China and abroad, recording the statistics of the domestic and foreign breakwater gap effective width in use, a statistical principle should be found as a result and it should provides a reference for the actual operation in the field.Author applys Google Earth to measure about500different types of breakwater gaps and the largest length of ships in ports seen from the satellite images. Then, SPSS is applied to analyze and count the data, so as to make a conclusion that the minimum control standards at home and abroad in the actual use of the effective width of breakwater gap is different. The dissertation also gives a possibility that we may break through our Chinese standard of use restriction about the effective width of breakwater gap.According to the consequences of analysis about, the data, it can be concluded that compared with foreign ports, in China, the actual operation control standard of the effective width of breakwater gap is conservative. There exists a relaxing space. Based on a large number of domestic and foreign examples, author puts forward a suggested control ratio value of the breakwater gap effective width and the largest length of ships. It provides an operation possibility for larger ship entering and leaving small ports or old ports under the existing conditions.