Urgent question: the history of Shanghai Dongtan?

Ming Island, with a length of 76 kilometers from east to west, a width of 13 ~ 18 kilometers from north to south, and a total area of 1 160 square kilometers, is the third largest island in China and the largest estuary sand island in the world. Chongming Island is continuously deposited by a large amount of sediment discharged from the Yangtze River under the interaction of rivers and seas. At the mouth of the Yangtze River, due to the sudden opening of the river surface, the decrease of flow velocity, tidal jacking and the intersection of salt and fresh water, a large amount of sediment discharged from the Yangtze River basin is deposited, forming a small estuary beach and then developing into a sand island. Chongming Island developed gradually in the process of the formation and evolution of many sandbars, and it is a typical estuarine alluvial island in terms of landform types.

Chongming Island mainly collapses in the south and rises in the north, and gradually connects several sandbars to form a big island in the constant ups and downs. After liberation, by building water conservancy and strengthening artificial siltation, the subsidence in the south basically stopped from 1960, and the siltation in the north and the east and west ends continued to expand, increasing the land of Chongming Island by more than 500 hectares every year. Dongtan is located at the easternmost tip of Chongming Island in Shanghai (east longitude

North latitude12145' to 3130'), the north and south are on the verge.

The Yangtze River estuary slowly extends eastward to the vast East China Sea, and

Away from the north and south continents. Chongming Dongtan Nature Reserve accounts for

It covers an area of 326 square kilometers, starting from Xijiagang in the south and reaching Beiba in the north.

Laigang is bounded by 1968 levee in the west and Wu in the east.

The elevation of the zero meter line is bounded by the outer 3000m waterline, like a semicircle.

The waters, land and beaches belonging to Chongming Island within the waterway line. belong to

Typical estuarine wetlands in the Yangtze estuary.

Dongtan is located in the middle section of the east route of migratory birds' north-south migration in China.

Geographical location is very important. Its biodiversity value is reflected in

Species diversity and ecosystem diversity. Dongtan

The vast and rich resources of benthos and vegetation are a climate.

The distribution center on the way to bird migration is also the wintering ground for waterfowl. arrogant

Mingdongtan recorded 3 12 species of birds, and millions of migratory waterfowl.

Only. Chongming Dongtan officially joined East Asia-Australia on 1999.

June 5, 2002 to1October 38, 2002, international wetland secretary, wading bird migration protection network.

The department officially accepted Chongming Dongtan as an internationally important wetland.

According to the national spirit of knowing and doing, Dongtan is now

The trend is to integrate sightseeing, leisure, tourism, vacation and popular science.

March into the international ecological park!