【摘要】 本文依据近年来在江苏近岸海区进行的悬浮泥沙取样、浅地层探测和水深测量资料,通过实验分析认为:苏北沿岸(包括辐射状沙脊群)的底质来源于各新老河流,弶港以南来自古长江,新洋港以北基本来自古黄河。弶港与新洋港之间为古黄河、古淮河和古长江沉积的混合物质,其悬浮泥沙除现代河流供给外,主要是来自当地的底质。 泥沙的移动方向为冬半年向外,一股沿33°N线向东入黄海,一股向东南至长江口南下;夏半年在大风大潮的情况下向岸推移,向湾顶沉积。滩面淤高最大平均每年为13cm,深槽下切最大平均每年为31cm。更多还原

【Abstract】 Based on the data obtained from the suspended sediment sampling, work on the shallow stratigraphy and bathymetry off Jiangsu have been carried out. Analyses show that the sediments off the northern part of Jiangsu coast have their source at new and old rivers, the sediments on the south of jianggang offshore were from the old Chang-jiang River, those on the north of estuary of Sheyang were mixed sediments from the old Huanghe, Huaihe and Changjiang Rivers. The recently suspended sediments of Jiangsu offshore are mainly from the local region besides the modern rivers.With the shift of Changjiang River mouth, especially the change of the Huanghe River in its course after 1855, the material provided with by the rivers was dwindled down greatly and the north shore- of the sand ridges was raised, giving rise to three offshore sediment currents. The dykes built along the coast raised the beach section relief rise by 3 meters under the influence of storm-tide. The topography of some areas has been changed because of the fast rising and extending of the beach surface as a result of influence of the storm-tide and the straightening of water channel caused by the ra- diation and converging of tidecurrents. The beach deposition rises at the highest mean rate of 13 cm/a and the deep water trough is cut downwards at the highest mean rate of 31 cm/a, the sediments in this area move eastwards into the Huanghai Se’a (Yellow Sea) in winter along 33°N and move southeastwards to the Ghangjiang River Estuary and deposit in coastal bays in summer under the action of storm-tides.更多还原