What line city is Huainan?

Huainan city is located at11621'5 "~1712' 30" and 3154' 8 "~ 3300' 26" north latitude.

The easternmost point is located in the east of Wangci Village, Kongdian Township, datong district, on the center line of Gaotang Lake, the westernmost point is located in the west of Houhaizi, Shangtang Township, Fengtai County, bordering Lixin County, the southernmost point is located in the south of Huaishuzhuang, Fenglou Village, Shouxian County, bordering jin an district, Lu 'an City, and the northernmost point is located in the center line of the main channel of Cihuai New River at the junction of Fengtai County, Mengcheng County and Lixin County. The longest distance from east to west in Huainan city is 80.23 kilometers, and the longest distance from north to south is 122.68 kilometers, with a total area of 5533 square kilometers. ?

topography

Huainan city belongs to Huainan syncline in the east of Huainan depression fold fault zone (namely Huai Yu fold zone of North China platform) in the Sino-Korean paraplatform structural unit. It borders Tanlu Fault in the east, Zhoukou Depression in the west, Bengbu Uplift in the north, Fu Depression in the south, Dongshan Fault and Liu Fu Fault in the north and south. The structure in this area is mainly NW-trending structure, which was strongly reformed in the later period, but the overall shape changed little, and secondary folds and faults developed in the compound syncline.

The history of geological evolution can be divided into three stages: pre-Sinian, Sinian-Triassic and Jurassic-Quaternary. Before Sinian, the crust of Huainan was in an active stage. Sinian-Triassic is a period of intense movement, which has experienced Bengbu Movement, Fengyang Movement, Southern Anhui Movement, Caledonian Movement, Huaxi Movement and Indosinian Movement. During this period, the earth's crust rose and sank many times, forming an alternating stratum of land and sea.

Especially in the Late Carboniferous and Permian, the sedimentary environment of land-sea interaction provided good conditions for the generation of coal resources, thus forming a large number of coal resources in China. From Jurassic to Quaternary, after Yanshan movement and Himalayan movement, the geomorphological features of this century gradually formed.

The urban boundary is bounded by the Huaihe River, forming two different types of landforms. South of Huaihe River is hilly, which belongs to Jianghuai hilly area. To the north of the Huaihe River is the flat Huaibei Plain, and the south bank of the Huaihe River is a discontinuous low hill rising from east to west, surrounded by a slope with a width of about 500 meters to 1500 meters, a slope of about 10 and an altitude of 40 meters to 75 meters. Below the slope belt, the secondary terraces of diluvial and alluvial deposits are staggered, with a width of 500-2,500m, an altitude of 30-40m and a slope of about 2.

Below the second terrace to the north of Shungeng Mountain is the first terrace of Huaihe River alluvial, with a width of 2,500-3,000m, an altitude of less than 25m and a gentle slope. Below the first terrace is the Huaihe River high beach, which is 2000-3000m wide and1.7-20m above sea level. Below the floodplain is the riverside shoal of Huaihe River.

Below the south slope of Shungeng Mountain, the first and second flood terraces of Gaotang Lake are on the east side, and the first and second flood terraces of Wabu Lake are on the west side; In the middle is hilly land. The plain area to the north of Huaihe River is a shallow valley plain between rivers, and the terrain is inclined from northwest to southeast, with an altitude of 20-24 meters and a height difference of 4-5 meters.