【摘要】 钱塘江河口是我国典型的山溪性强潮河口,因其河口有涌潮而举世闻名。一般讲,该河口系陆源与海域两种物质来源、径流与潮流两种动力、淡水与盐水两种介质所构成的复杂多变的沉积环境,形成由悬沙和底质组成的河口现代沉积系统。在杭州湾内砂坎中沙粒级(>O.063mm)、粉沙粒级(O.063—O.004mm)与粘土粒级(<O.004mm具有2∶6∶2的比例,折断的锆石晶体标志涌潮对砂坎的巨大影响。更多还原

【Abstract】 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 chang-able 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.更多还原