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钱塘江河口沉积作用初探
张志忠1, 徐志刚1
杭州大学河口与港湾研究室
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(
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AN APROACH TO THE SEDIMENTATION IN QIANTANGJIANGESTUARY
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 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.
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