论文部分内容阅读
本文讨论了全新世海侵对长江三角洲南部平原的影响.海进初期,长江、钱塘江谷地首先遭海水浸淹.8 000—7 500年前的海岸线与古地形-7米等深线相近.7 000—6 500年前,海平面已与现代海面相当,海进达最大范围;当时长江、钱塘江、东苕溪谷地为河口湾,上海东部地区为浅海,杭嘉湖和洮滆平原有小型海湾和澙湖,太湖周围丘陵区为滨海沼泽和淡水沼泽.7 000—4 000年前上海西部岗身形成,4 000年以来其东侧滨海平原快速向海推进,西太湖区封闭成淡水湖泊.
This paper discusses the impact of Holocene transgression on the southern plains of the Yangtze River Delta, where the Yangtze River and Qiantang River valleys were first flooded by sea water in the early years of the seaward, and the coastline of 8000-700 years ago was similar to that of the ancient terrain -7m. 7 000-6 500 years ago, the sea level had been equivalent to that of the modern sea and the sea reached its maximum range. At that time, the estuary of the Yangtze River, Qiantang River and Dongtang River were estuaries, the shallow sea was in the east of Shanghai, the small gulfs of Hangjiahu and the Baotu Plain The lakeside area around Taihu Lake is the coastal marsh and the freshwater swamp.7000-4000 years ago, the western part of Shanghai formed its posts, and the coastal plain on the east side of the Taihu Lake advanced rapidly to the sea in 4,000 years. The West Taihu Lake area was sealed into a freshwater lake.