When did the Yangtze River water enter Dongting Lake through Huarong Uplift and form a vast lake?

Eastern Jin Dynasty and Southern Dynasties.

During the Eastern Jin and Southern Dynasties, the river crossed Huarong Uplift and entered Dongting Lake area, forming a vast lake. The invasion of the northern part of the Yangtze River made the Jingjiang River bigger, which strengthened the erosion to the south. This is a description of the evolution of Dongting Lake.

Evolution of Dongting Lake after Eastern Jin Dynasty and Southern Dynasties;

1. During the Tang and Song Dynasties, the lake was further expanded, forming a "800-mile Dongting";

2. During the Ming and Qing Dynasties, Dongting Lake reached its largest area, and then began to shrink: the Yangtze River silted up and the bottom of the lake rose;

3.19-20th century, two ports, Tainei and Songzi, were formed. After passing through the four ports of Jingjiang River (Hudu and Diaoxian), 45% of the sediment in Jingjiang River is injected into the lake area, and the lake shrinks due to siltation and artificial dike construction.

4./kloc-Dongting Lake has been shrinking for 0/00 years, which is the dual role of nature and manpower.

Extended data:

The historical role of Dongting Lake;

Dongting Lake is the first of the five lakes since ancient times and the largest Tongjiang lake in China. Due to the interaction and mutual restriction of natural and human factors, Dongting Lake has experienced an evolutionary process from small to large, and then from large to small.

Dongting Lake has a large amount of flood storage, which has saved countless floods in the Yangtze River, and Jianghan Plain and Wuhan three towns have been able to survive the flood season safely. No matter the storage area or storage capacity, it is still the largest regulating lake in the Yangtze River basin and the largest freshwater lake in China. After 1978, some people called it the second largest freshwater lake in China, which is debatable.

Baidu Encyclopedia-Dongting Lake