Chengdu Plain is developed on the basis of northeast-southwest syncline structure, and consists of eight alluvial fans, such as Minjiang River, Tuojiang River (Mianyuan River, Shiting River and Juanjiang River) and their tributaries, which originated in the northwest of western Sichuan Plateau.
The interior of Sichuan basin is not flat, and there are many hills and mountains (but the basin topography is presented relative to the surrounding mountains). Because of the alluvial of Minjiang River, Tuojiang River, Fujiang River and other rivers, this area of Chengdu Plain has formed a relatively flat plain, so people call it Chengdu Plain alone.
Extended data Chengdu Plain is developed on the basis of northeast-southwest syncline structure, which is composed of eight alluvial fans, including Minjiang River, Tuojiang River and their tributaries, and originated in the northwest of western Sichuan Plateau. The whole plain has loose surface, thick sediments and flat terrain, with an average slope of only 3% ~ 10% and a relative height difference of less than 20m. ?
Chengdu Plain is surrounded by mountains, and its basement is composed of Cretaceous and Paleogene clastic rocks (red beds). The main material of the plain is composed of Quaternary loose deposits. The plain has four distinct seasons, less sunshine, mild climate and abundant rainfall, and belongs to the warm and humid subtropical Pacific southeast monsoon climate zone. Its water system pattern is special and spindle-shaped. Out of the mountain pass, the river is divided into many tributaries, which run to the plain, criss-crossing tributaries and criss-crossing canals. ?
The terrain of Chengdu Plain inclines from northwest to southeast, generally about 600 meters above sea level, with fertile soil. Dujiangyan irrigation project, which is famous since ancient times, has developed agriculture, rich products and dense population. It is an important rice, sugarcane, silk and rapeseed producing area in China, and has been known as "Land of Abundance" since ancient times.
Baidu Encyclopedia-Chengdu Plain