论文部分内容阅读
怎样确定大城市的防洪标准,是防洪问题中比较复杂,需要探讨介决的一个重要课题。本文仅就上海市区的防洪标准问题,谈谈自己的管见,一、上海的自然地理环境上海地处长江三角州的前缘,太湖流域的下游。北濒长江,东滨东海,南临杭州湾,西界江、浙两省。全市总面积6190平方公里,人口1194万,其中市区面积为222.9平方公里,人口639.1万人,平均每平方公里2.75万人,市中心区的人口密度则高达4.17万人。市区河网稠密,水域面积约占总面积的11.3％。流经市区的主要河道有黄浦江、苏州河等,这些河流上游与太湖沟通,下游均
How to determine flood control standards in big cities is an important issue in flood control issues that needs to be discussed and resolved. This article only on the urban flood control standards in Shanghai, talk about their own management, First, Shanghai’s natural geographical environment Shanghai is located in the front of the Yangtze River Delta, the lower reaches of the Taihu Lake Basin. North Bin Yangtze River, east coast of the East China Sea, Hangzhou Bay in the south, the western border Jiang, Zhejiang provinces. The city’s total area of 6190 square kilometers, population 11940000, of which the urban area of 222.9 square kilometers, population 6391000 people, an average of 27500 people per square kilometer, the downtown area’s population density as high as 41 700 people. Dense urban river network, the water area of about 11.3% of the total area. The main rivers flowing through the urban area are the Huangpu River and Suzhou River, which communicate with the Taihu Lake in the upper reaches and the lower reaches