Study Of Stability From An Angle Of Channel-sand System On The Mid-south Part Of Radial Sand Ridges

To cooperate with the construction of international ship center of Shanghai and achieve continuance, high speed and balanced development of region economy, coast of jiangsu need to build big seaport. However there is only one big seaport of Lian Yungang along the almost a thousand km coastline of jiangsu at present, central and southern part are blank of harbor-building and it weakens the ocean economy of Jiangsu. One of the main reason of this status is that there is radial sand ridges at Jiangsu out-shore and stability is the critical factor in exploring of seaport this area. Since 1980 of last century, research of radial sand ridges broke through the traditional idea of harbor-building is impossible at radial sand ridges area. Stability of channel-sand plays an important role in the build of seaport in the area of radial sand ridges.The tide channel of Lanshayang at mid-south of radial sand ridges area has predominant condition of water deep for harbor-building and the channel-sand compages provides the basic condition for region harbor-building.Based the foregoing study of radial sand ridges, data of submarine-terrain, fixed profile, remote sensing, are used to analyze the facial and submarine change of the compages, in aim to understand the long-term evolvement trend controlled by tide current and short-term clash turbulence .The result is that the long-term evolvement trend of the compages resembles that of the radial sand ridges . At the same time ,there is a short-term turbulence in this area. Differs with other researches, the article put forwards the explore study of seaport from the view of maintain the stability of channel-sand system.Based on the all long exist part of Xitaiyangsha for lately 40 years, designed a false-island, and analyzed the possible affects of engineering on stability of channel-sand system and wave on the island by physical model. Test indicated that, the built of the island has little affect on the system and the wave affects intensively on the island especially on the part of Northeast.Conclusion of this article has an important theoretic and pratical meaning to the exploring of this area.