Wuhai city
Wuhai City is located in the upper reaches of the Yellow River, bordering Ordos Plateau in the east, facing Shizuishan City in Ningxia across the river in the south, Alashan Grassland in the west and fertile Hetao Plain in the north. It is the junction of North China and Northwest China, and also the junction of "Ningmeng but Shaanxi and Gansu" economic zone and the central area of the economic belt along the Yellow River. Total area 1754 km2. The basic landform is characterized by "three mountains, two valleys and one river".
Table Mountain stretches for hundreds of miles in the east, Gander Mountain in the middle and Wuhu Mountain in the west. Each mountain belongs to the northern end of Helan Mountain, and the three mountains are arranged in parallel in the north-south direction, forming two flat valleys in the middle. The Yellow River flows through the urban area along the Gangdeer mountain valley, blocking Wulanbuhe desert from entering the Hetao area. Wuhai terrain is high in the east and west and low in the middle.
The landforms in the region are divided into four categories: the low-middle mountainous areas with structural erosion account for 40% of the total area of Wuhai, the denudation hilly areas account for 20% of the total area of Wuhai, the piedmont alluvial fan areas account for 30% of the total area of Wuhai, and the Yellow River alluvial terrace accounts for 10% of the total area of Wuhai.
Wuhai City is located in the depths of the mainland and belongs to a typical continental climate. Its climatic characteristics are less snow in winter, drought in spring, hot and high temperature in summer, and sharp drop in autumn. Spring and autumn are short, winter and summer are long, the temperature difference between day and night is large, and the sunshine time is long, which shows that the light resources are rich.
The average annual temperature is 9.6℃, the extreme maximum temperature is 40.2℃, the extreme minimum temperature is -36.6℃, the average annual sunshine time is 3 138.6 hours, the average annual solar radiation energy is 155.8 kcal/cm2, and the average frost-free period is156-/kloc-0. The average annual precipitation 159.8 mm, average relative humidity 42% and average evaporation 3289 mm.
The annual average wind speed is 2.9 m/s, and the instantaneous maximum wind speed is 33 m/s. Wuhai is one of the most abundant and ideal areas for the development of breeding industry and efficient agricultural light and heat resources, and all crops in the north are suitable for planting here, with high yield and high quality.
The general trend of annual runoff distribution of surface water in Wuhai city is that the hilly area is larger than the plain area and mountainous area. In mountainous areas, the rocks are exposed, the ground slope is large, and the runoff depth is large, generally 3-5 mm.
In hilly areas, the vegetation is poor, the ground slope is large, and the runoff depth is 1.5-3mm. There are more vegetation in wide valley and gully, and the ground slope is slow. The soil is mostly sandy loam, and the runoff depth is below1.5mm. In some areas, desertification is serious and no runoff is generated.