The impact of human activities on Chongming Island, how Chongming Island was formed

I am a native of Chongming! According to experts, in about 100 years, Chongming will border Jiangsu! The current situation is to vigorously develop the ecological island!

But the fact is that the common people are getting poorer and poorer! Without the development of industry, the income of the peasants is pitiful! And just a few fields can't adapt to modern society at all!

The development of the ecological island only allows the best to make money, and the people can not get real benefits! The transportation is not convenient, but it can be improved in 2010! The common people are simple!

The impact of human activities is to keep Chongming Island from becoming an isolated island! Because if you want to live a good life, you have to go out to work! Without a university, all students have to leave Chongming to study!

There are few people who want to go back after graduation!

All I know is that now Chongming is planting reeds on the periphery of the embankment, and when the reeds have fixed enough land, trees can be planted, so that in a few years the area of the island will be larger, which is equivalent to increasing the land area.

I don't know anything else.

What is the impact of human activities on Chongming Island? 1. First of all, of course, to increase the area of the island; 2. Reduce the wetland area on the island (the wetland civilization on the east beach of Chongming Island, the wetland is an indispensable geographical condition for the survival of human beings and many kinds of animals and plants); 3. But in the future, Chongming Island should be more suitable for all kinds of animals to live than now, because Chongming Island now has a development direction, that is, to establish an ecological island, and I am still very confident in the people of Shanghai!

In the early days, Chongming Island was formed by the siltation of sediment from the middle reaches of the Yangtze River in the Yangtze River estuary, and in the later period, it was formed by human reclamation and land reclamation! Under the influence of the earth's deflection force, Chongming Island has formed today's shape!

Chongming Island, located at the mouth of the Yangtze River, is the third largest island in China, known as the "gateway of the Yangtze River and Yingzhou in the East China Sea", and is the world's largest estuarine alluvial island and the world's largest sand island.

Chongming Island is a product of the development of the new Yangtze River Delta, and its original location is the shallow sea outside the Yangtze River estuary. When the Yangtze River flows eastward and flows into the estuary area, a large amount of sediment is gradually deposited here due to the decrease in specific drop and the slowdown in the flow rate. On the one hand, it creates a coastal plain on the north and south banks of the Yangtze River estuary, and on the other hand, it forms a dotted estuarine sandbar in the middle of the river.

In this way, Chongming Island has gradually become a typical estuarine sand island. From the time it was exposed to the surface of the water to the time it finally formed a large island, it has undergone more than 1,000 years of ups and downs.

In 618 626 A.D. (during the reign of Tang Wude), two sandbanks rose in the water south of the Yingzhong draft of Dongbuzhou (now Lüsi area). The two continents are separated by water for more than 70 miles, and they are called Dongsha and Xisha (also known as Gu Junsha), which is the predecessor of the island. In 1025 (the third year of Song Tiansheng), Yao and Liu Sha (named after the surnames Yao and Liu lived first) in the northwest of Dongsha, and bordered Dongsha.

In 1101 (the first year of the Yasukuni Kingdom of Song Jianzhong), Yao Liusha rose out of Sansha 50 miles northwest across the water (because of the three stacked rises, hence the name; It is also said that it is named after the three surnames of Jurong Zhu, Chen and Zhang).

1271 1368 (Yuan Dynasty), successively rose out of the camp front sand, Ma Da Sha, Zhang Pu Sha and other more than 10 sand. At the end of the Yuan Dynasty and the beginning of the Ming Dynasty, the East Sha collapsed, the West Sha collapsed and there was little, the Sansha rose in the north, Yao Liu Sha collapsed in the south and rose in the north, and gradually bordered with Sansha. 1399 In 1644 (from the beginning of the Ming Dynasty to the end of the Ming Dynasty), more than 30 sands such as Ma'ansha, Chen Ensha, Gaomingsha, Xiaoyinsha, Changsha, Yuanjiasha, Xiangsha and Gaotousha were successively raised.

1522 1722 (from the beginning of Jiajing in the Ming Dynasty to the end of the Kangxi Dynasty in the Qing Dynasty), the sand rose and collapsed frequently. Yao Liusha and Sansha collapsed, Xisha, Chen Peixiao Ensha, Fan Liansha and so on fell into the water successively, Pingyang sand first rose and then collapsed, while Changsha and the collapsed Pingyangsha and the surrounding Yuanjiasha, Wujiasha, Xiangsha, Nansha sand rose into a piece. Around 1644 (the end of the Ming Dynasty and the beginning of the Qing Dynasty), Chongming Island was connected into a large island with a length of 200 li and a width of 40 li.

First, the reasons for the formation and development trend.

Sediment accumulation in the Yangtze River belt. Affected by the geostrophic deflection force, the Yangtze River has a serious erosion on the south bank, and the north side is easy to block, so Chongming Island may be connected with the north bank of the Yangtze River.

Second, the reason. The irrational reclamation and cultivation in the middle and upper reaches of the Yangtze River has caused serious water loss, and a large amount of sediment has entered the Yangtze River.

Lack of attention to environmental protection in the mining of minerals has led to the destruction of ground vegetation.

A large amount of domestic and industrial solid waste is dumped into the Yangtze River.