Tuotuo River: Let's talk about it.

Section 1 Overview 1. Physical geography The Yangtze River originates from the northern foot of Tanggula in Qinghai-Tibet Plateau and the south side of Glading Winter Snow Mountain. The source of the river is Tuotuo River, and its main stream flows through Qinghai, Tibet, Yunnan, Sichuan, Chongqing, Hubei, Hunan, Jiangxi, Anhui, Jiangsu, Shanghai, etc. 1 1 province (city, district), passes through the three economic zones of Southwest China, Central China and East China, and flows into the East China Sea in Shanghai. The Yangtze River, with a total length of more than 6,300 kilometers, is the largest river in China and one of the largest rivers in the world, with a drainage area of about 6,543.8+0.8 million square kilometers, accounting for 654.38+0.87% of the country's total area. The shape of the Yangtze River basin is long from east to west, short from north to south, high in the northwest and low in the southeast. Here we go again. 2. Meteorological and hydrological characteristics The Yangtze River Basin is located in the subtropical zone in the east of Eurasia, with a typical monsoon climate. South winds prevail in summer, north winds prevail in winter, and Leng Xia is hot in winter, with four distinct seasons. The average annual precipitation in the basin is 1067mm, and the regional distribution and annual distribution of annual precipitation are very uneven. The Yangtze River flood is formed by rainstorm, so the flood occurrence time and regional distribution are consistent with rainstorm.