中文摘要：

本文在获取研究区多波束水深和反向散射强度数据的基础上，应用CARIS、Global Mapper等后处理软件对数据进行分析和处理，获得高精度的海底地形地貌，对研究区出现的沙波地貌进行研究，并探讨其动力学成因；利用量化的底质反向散射强度图像对研究区的底质类型进行识别和分类，主要得出以下结论：研究区沙波主要为大型沙波；从沙波形态分析，流水波浪主要为NE-SW及NW-SE向；研究区底质反向散射强度值区间为-15--30dB，由粒度从大Nd,的顺序可将研究区底质分为砂、粉砂和泥质三种。对比采集的站位样品资料发现，通过多波束反向散射强度来对底质进行分类的准确性是非常高的。高精度的多波束数据对海底沉积地貌和底质类型的识别有着重要的作用。

英文摘要：

Based on multibeam bathymetry and backscatter intensity data of the study area, CARIS and Global Mapper were applied to analysis and processing of the data in this paper, and then the high precision underwater topography obtained; sand wave＇s geometry characteristics and its dynamic origin were studied; quantitative mean backscatter intensity image was used for seabed sediment recognition and classification, which mainly draw the following conclusions： ①Large-scale sand waves are widely distributed in the study area; seafloor engineering is relatively strong and complex in the study area, erosion is obvious, mainly tidal-flow direction nearly east-west trend, water wave is mainly NE-SW and NW-SE direction. ②Seabed sediment backscatter intensity value interval was -15--30dB in the study area, sediment in the study area can be divided into sand, silt and clay based on the mean size of the grain; Contrast to the collected samples, we found that the classification depending on the multibeam backscatter intensity has high accuracy. High precision multibeam data play important role in marine sedimentology study.