台风对北部湾南部海底地形地貌及海底管线的影响

The Influence on Topography and Relief in South Gulf Beibu and Suspending of Pipe Caused by Typhoon

利用旁侧声纳和多波束在不同时间段内对琼西南近岸海域进行了探测 ,并对台风前后的旁侧声纳资料进行了对比和分析。研究表明 ,琼西南近岸海域主要存在沙脊区和沙波区两种地貌类型 ,其中 ,沙波波高在 1～ 5 .5m,波长 3～ 6 0 m,沙脊波高在 6～ 2 0 m,波长 2～ 4 km。在不同年份和台风期间 ,沙波和沙脊存在明显的活动性 ,对铺设于此的海底管线构成了严重的影响。台风对小沙波起夷平作用 ,对较大沙波、沙脊增高加宽 ,并且可以使海底出现冲刷沟槽和凹坑。

We investigated the area along the shore of southwest Hainan by using the side-scan sonar and the multibeam The data before and after typoon was analyzed and contrasted The result indicates there are two type of topography in the area, the sand wave and the tidal current ridge, and the wave height of sand wave is 1～5 5m and wavelength is 3～60m; the wave height of ridge is 6～20m and wavelength is 2～4km In different years and during the course of typhoon, the sand wave and the tidal current ridge have a clear movement, which has an effect on paving pipes The typhoon can corrode and unbuild the small sand wave, and makes the large sand ridge higher and broader The sea floor would produce some brush groove and sunk when typhoon got across