However, Jiao Lao's mother and daughter delayed the chance of escape because they told their neighbors, and were swallowed up by the flood in Tao Tao. Later generations admired Jiao Lao's noble character of self-sacrifice and saving others, so they named the trapped lake "Jiao Hu" and the mountain in the lake "Lao Shan".
Extended data:
The geological structural unit of Chaohu basin is located at the intersection of Tarim-China-Korea plate and South China-Southeast Asia plate. These two plates converged in the Indosinian Movement at the end of Triassic about 65.438+0.95 billion years ago, forming the modern Anhui continent.
Chaohu Lake Basin is at the junction of these two plates. During the Yanshan Movement after Indosinian Movement, Chaohu Basin was characterized by vertical fault depression during the whole Jurassic and Cretaceous period of about 1.96 ~ 0.8 billion years.
Jurassic Cretaceous strata with a thickness of several thousand meters were deposited from the western border of Anhui Province to Chaohu Lake. From the Himalayan period to the Tertiary, the Chaohu area was further fractured, along a set of faults and faults in the northeast and another set of faults in the northwest.
The running water at the northern foot of Dabie Mountain is blocked here. Form a rift lake. From the end of Tertiary to the beginning of Quaternary (5-3.5 million years ago), the lake area was relatively large.
From the late Pleistocene to the Holocene, about 6.5438+0.5 million years ago to the present, a large amount of sediment continued to flow into the lake, and the area of the lake continued to shrink, eventually forming the modern Chaohu Lake.
Historically, Chaohu Lake is surrounded by mountains and trees, with clear water, fish and shrimp. Chaohu Lake is a shallow lake with a river and a large area of marshland and aquatic plants.
It provides a good spawning, breeding and fattening place for migratory and semi-migratory fish, and also creates suitable habitat conditions for settled fish. Therefore, rich in aquatic resources, known as the "sunrise for gold".
By the 1990s, there were few trees in the basin, and the forest coverage rate was only 6.7%. Woodland has increased, but 60% of it is young forest and sparse forest, and the cutting volume is greater than the growth, and the timber volume is still declining.
The coverage rate of aquatic vegetation was about 30%( 193 1) 20 years ago, and it was about 10 ~ 20% in the early 1950s. 1954, the vegetation in Dashui Lake area was almost completely submerged.
In the early 1960s, it was about 20,000 mu, of which submerged plants and floating plants were only distributed in points, and the number was very small. Later, it was destroyed by human activities in the 1969 flood and the "Cultural Revolution".
According to the statistics of 1978, the vegetation in the lake area is only 4700 mu, accounting for only 0.4% of the lake area. After Yuxi Gate and Chaohu Gate were built 1959 and 1960 respectively, the only river channel in Chaohu Lake was manually cut off, and the gates were generally closed from March to August every year.
In order to prevent the river from flowing backwards, it is the spawning season of migratory fish and the flood season of Yangtze fry. The river and lake are isolated, which cuts off the migration channel of fish and the opportunity for Yangtze fry to flow backwards into the lake.
At the same time, the over-exploitation of fishery resources has greatly reduced the supplementary sources of fish groups in Chaohu Lake, resulting in changes in fish fauna composition and a sharp decline in catch yield.
After the completion of the sluice, the catch of grass, silver carp and bighead carp has been greatly reduced, and the migratory fish such as Kun, bream, mullet, shad and eel in San Qian are on the verge of extinction. Before the sluice was completed, the output of 1952' s "four big fish" reached 2.5 million Jin.
It accounts for 3 1.3% of the total catch, increased to 90% in 1.960, and decreased sharply in 1.963, accounting for only 1.5% of the total catch. In 1980, the total output of big fish only accounted for 1.980.
Due to the shrinking of land area and the increase of population, and the long-term "grain as the key link" after the founding of the People's Republic of China, farmers along the lake spontaneously and systematically expanded land reclamation around the lake in order to obtain enough land.
The artificial reclamation of Chaohu Lake can be traced back to 1700 years ago. There are more than 360 natural tributaries and bays in the original lake, which have been reclaimed by successive dynasties. In the Qing Dynasty alone, the total area of reclamation along the lake reached 628,000 mu.
After the founding of the People's Republic of China, there are still sporadic plots of land around the lake. Artificial beach reclamation destroyed the ecological environment of the water area and changed the natural form of the lake. Binhu in Feixi County, Beizha and Tongchun in Lujiang County.
Reclamation areas in Chaohu City, such as Guishan, Sanbing and Huatang, used to be good lakes and bays, as well as fish spawning grounds with more aquatic plants and rich feed. After reclamation, the grass beach was seriously damaged.
Baidu encyclopedia-Chaohu lake