AN APROACH TO THE SEDIMENTATION IN QIANTANGJIANGESTUARY
钱塘江河口沉积作用初探

The Qiantangjiang Estuary is a typical example of the estuaries with mountain river-macrotidal estuary and sea sourced matter in China, its estuary being world famous for the tidal bore. In general speaking, the Qiantangjiang Estuary is the complex and changable sedimentary environment formed by two source of the materials, the sea source and land source; two dynamics, the runoff and tide current; two mediums, the fresh water and salty water which from the modern sedimentation system being composed of suspended sediments and bottom materials. The sand grading (>0.063mm), the silt grading (0.063-0.004mm) and the clay grading (<0.004mm) have the ratio of 2:6:2 in the big sand bar inside the Hangzhou Bay. The zircon crystal borken marked the great influece of the tidal bore on the big sand bar.