Topography and geomorphology of Suining
Suining is a hilly and low mountain area in the central part of Sichuan Basin, with simple geological structure and gentle fold. The landform type is single, belonging to the Mesozoic Jurassic strata, which is eroded, cut and accumulated by flowing water. Hills account for 70% of the total area of Suining, river valleys and terraces account for 25%, and low mountains account for 5%. The altitude ranges from 300 to 600 meters. From the high altitude, the terrain in the territory presents three obvious characteristics: first, hills are the main features, flat dam is narrow, layered terrain is obvious; second, the terrain is high in the northwest and low in the southeast, with a gentle slope from northwest to Southeast; third, valleys and rivers are vertical and horizontal. In the northwest of the city, there are low mountains with an altitude of 500-600 meters; to the south of the low mountains are deep hills with an altitude of 400-500 meters; the middle and shallow hills in the middle and South are inlaid with steep valley slopes. The shape of the hill is in the shape of a placanticline fish back; the middle hill is a step shaped ridge Hill connected; the slope of the shallow hill is gentle, the mound is beaded, and scattered alluvial flat dams are scattered between the hills. The river valleys and flat dams along the Fujiang River are open.