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《Geography and Territorial Research》 2001-03
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A Study of Intertidal Flat Morphodynamics of A Large River Mouth: Yangtze River Mouth

YANG Shi-lun 1,XIE Wen-hui 2,ZHU Jun 1,ZHAO Qing-ying 1 (1.State Key Lab of Estuarine & Coastal Research, East China Normal University, Shanghai 200062; 2.Donghai Marine Engineering Survey & Design Institute, Ocean Bureau of China, Shanghai 200120,  
The development of intertidal flat in river mouths depends on favorable conditions such as riverborn sediment supply, estuarine hydrodynamics and morphology of seabed. The intertidal flats of the Yangtze River mouth benefit from these conditions. For a large mouth, there are different types of intertidal flats: "attached bar", "spit" and "isolated bar" in relation to the land, and "broad flat", "sharp bank" and "eroded cliff" according to the shape of cross-shore profile. Tidal currents on the flat are basically back and forth along the river channel banks but gyre on the seaward side. The flow speed is gradually reduced with increase in elevation along the cross-shore profile. The river discharge strengthens ebb flows and modifies current asymmetry especially on the lower flat in neap tide, although hydrodynamics over the tidal flat is tide-dominated. Wave height over the tidal flat is normally limited to a few decimeters although it changes with water depth, slope and wind climate. Intertidal flats of the Yangtze River mouth are characteristic of high turbid water (the suspended sediment concentration is from hundreds of mg/l to thousands of mg/l. There are different time-scales of accumulation and erosion on intertidal flats of large mouths, although rapid progradation is a trend.
【Fund】: 国家自然科学基金资助项目 (4 0 0 76 0 2 7);; 国家杰出青年基金资助项目 (4 982 5 16 1);; 教育部高校骨干教师 资助计划项目“淤泥质潮间带短期冲淤过程及其主控因子”
【CateGory Index】: P737.12
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