Jiangsu, with a coastline of nearly a thousand kilometers, why is the presence of the ocean so low？
There is such a province in China, which is along the coast, but there are almost no islands. On Baidu map, the coastline is very smooth, which is Jiangsu Province! Different from the relatively rapid development of coastal cities in other provinces compared with inland cities, the per capita GDP of the three coastal prefecture-level cities-Nantong, Yancheng and Lianyungang is only 67% of the whole province, which belongs to the low valley of economic backwardness in Jiangsu Province.
ocean resources
The total sea area of Jiangsu is about 37,500 km ㎡. In marine geography, most of Jiangsu waters belong to the Yellow Sea, and only the waters east of the Yangtze River estuary and south of the line from Yuanduojiao in Qidong to Jeju Island in South Korea belong to the East China Sea.
The coastline of Jiangsu is 954km long, starting from the Embroidered Needle Estuary in Ganyu District of Lianyungang City in the north, bordering Shandong Province, and reaching Lianxing Port in Qidong City, Nantong City on the north bank of the Yangtze River estuary in the south. Jiangsu coast types include bedrock coast, sandy coast and muddy coast, with silt and muddy coast as the main one.
The shallow sea area accounts for 1/5 of the national shallow sea area. In the central coastal area of Jiangsu Province, there are the first radial sandbars on the seabed in China-radial sand ridges, covering an area of about 1268.38k㎡. Jiangsu’s coastal topography is low except Yuntai Mountain in Lianyungang City, which is located in the north, and the topography of the piedmont hills fluctuates greatly. The other landforms are low and flat, belonging to the coastal marine plain area, and the elevation is generally within 5 m.
Island resources
qinshan island
According to statistics, there are 26 islands along the coast of Jiangsu (Pingdao, Pingdao East Reef, Dashan Island, Huashi Reef, Dashan South Island, Dadong Reef, Cheniushan Island, Niuwei Island, Niubei Island, Niujiao Island, Niuniu Island, Qinshan Island, Xiaodao Island, Zhudao, Liandao, Gedao, yangshan Island, Kaishan Island, Dashi Reef and Chuanshan Island. Dashan Island, Ma Cai Heng and Waikejiao are the basic islands of the national territorial waters.
But compared with more than 3000 in Zhejiang, it is almost negligible.
Distribution number of islands in eastern coastal provinces of China
Liandao
How is it so difficult to eat "sea" food in Jiangsu?
Apart from Lianyungang, it is difficult to find such a scene in Jiangsu. This bedrock coast is suitable for building a deep-water harbor.
lianyungang
"Facing the sea, spring blooms", the sandy coast with beautiful scenery and gentle slope is suitable for opening beaches.
Most of Jiangsu’s coasts, however, are neither. Although Lianyungang is a bedrock coast, it has been pitted by its geographical location, and the existence of bugs in this coast is geographically called muddy coast.
Sanya
Jiangsu is rich in tidal flat resources, with a total area of 5001k㎡ ㎡, accounting for about 1/4 of the national total, including 307k㎡ ㎡ of tidal flat in the supratidal zone, 2677k㎡ ㎡ of tidal flat in the intertidal zone and 2017k㎡ ㎡ above the theoretical lowest tide level in the radial sand ridges.
Yancheng
How did this kind of coast form?
The Yellow River took the Huaihe River into the sea, and the yellow water carrying more than 1 trillion tons of sediment went south several times, encroaching on the territory of the Huaihe River, and taking away the estuary of the Huaihe River. The result can be imagined.
The two big rivers carried a lot of sediment and piled up along the coast of Jiangsu, filling the small bays and flooding the islands, and over time they developed into muddy beaches, which is the reason why there are almost no islands and the coastline is relatively smooth in Jiangsu Province.
ancient riverbed of the yellow river
This bug is not all a pit.
Even if the coast of Jiangsu is not fat, it is always meat together, not to mention that it has many uses for fishing, drying salt and building land.
1. Fishing and fishing
Along the coast of Jiangsu, there are more than 20 rivers flowing into the sea here. The water quality in the sea area is fertile, the salinity is moderate, and the bait is sufficient, which is an ideal place for fish, shrimp, crab and shellfish to grow and breed. From the cultural relics unearthed in the Neolithic Age, it can be seen that people at that time had already made a living by fishing on the coastal beaches.
However, Jiangsu can only be said to be a big marine province, but it is not a strong marine province. The fishery is less than 20% of Shandong Province and 40% of neighboring Zhejiang Province, and its advantages have not been fully exerted.
2, salt salt
The muddy coast is flat, which is not only convenient for introducing seawater, but also difficult for brine to infiltrate. It is an extremely favorable place to "cook the sea for salt".
Yancheng, as its name implies, is a city born of salt. In the Western Han Dynasty, this area was even as rich as an enemy because of boiling salt and smelting iron, and launched the famous "Seven-country Rebellion". However, Yancheng is now "returning salt to wet", and the continuous tidal flat Yantian has become a wetland, becoming the hometown of the deer and the hometown of the crane.
3, underground
In this era of land and gold, the importance of land is self-evident. Since Fan Zhongyan built a seawall in the Song Dynasty, nearly 2,000 square kilometers of coastal beaches have been developed and cultivated in Jiangsu, and it is still silting up at a rate of more than 20,000 mu per year.
Directly expand the land area-I’m afraid few provinces have this skill?
In addition to the naturally rising land, Jiangsu coast also has the conditions for large-scale reclamation. According to the Jiangsu Coastal Area Development Plan, another 1,800 square kilometers of coastal beaches will be reclaimed by 2020.
4. Wetland resources
The Yellow Sea (Bohai Sea) migratory bird habitat (Phase I) is located in Yancheng City, Jiangsu Province. It is mainly composed of intertidal beaches and other coastal wetlands. It is a key hub on the migration route of East Asia-Australia migratory birds, and it is also a stopover, molting and wintering place for millions of migratory birds around the world.
This area provides habitats for 23 species of birds of international importance and supports the survival of 17 species on the IUCN Red List of Endangered Species, including 1 critically endangered species, 5 endangered species and 5 vulnerable species.
Fisheries, salt industry and agriculture only belong to the initial stage of coastal beach development. The future of this beach is still hovering between opportunities and challenges, and maybe one day it will become a "golden coast"!
According to chinese national geography and Jiangsu Yearbook.