Based on field hydrographic surveys and sediment data analysis,the influences of water and sediment characteristics,component of deposited material and variation of salinity on depositional rate of sediment in the area is discussed and sediment source as well.

Analysis and study on the sound velocity empirical equations of seafloor sediments;

A study of the relationship between acoustic attenuation of seafloor sediments and water content;

Experimental study of the relationship between temperature and acoustic attenuation of seafloor sediments;

A research on error analysis of seabed sediment porosity by calculation method and sonic speed retrieval method;

Influences of granule factor of seabed sediments on acoustic attenuation under different frequencies;

Studies on clustering analysis of acoustic and physical-mechanical properties of seabed sediments;

The Research of PCBs and PAHs in Sediments of Songhua River;

Electronic microscopy,X-ray diffraction,infra\|red spectrometry,atomic absorption spectrometry and chemical analysis are used for a comprehensive analysis of the exterior form and the primary,secondary and small component parts of the sediment samples collected from Xiaoqing River in Jinan,Shandong Province.