What is the altitude difference between Shijiazhuang and Zhangjiakou?

Shijiazhuang and Zhangjiakou have complex landforms, and the terrain is quite different. Calculated by the so-called urban location, the average height difference between the two is 400 meters to 700 meters.

I. Shijiazhuang

1, geographical location

Shijiazhuang is located in the south-central part of Hebei Province, bordering Hengshui in the east, Xingtai in the south, Shanxi Province in the west and Baoding in the north, 270 kilometers away from the capital Beijing. The longest in the north-south direction is 246 kilometers, the widest in the east-west direction is 2 1 1 kilometer, and the surrounding boundary is 898 kilometers long. The total area of the jurisdiction is 20235 square kilometers, of which the urban area is 2206 square kilometers.

2. Topography

Shijiazhuang city spans Taihang Mountain and North China Plain. The west is located in the middle of Taihang Mountain, accounting for about 50% of the total area of Shijiazhuang. Hutuo River alluvial plain in the east, with structures in its jurisdiction, belongs to the marginal zone of Shanxi platform and Bohai sag, with low terrain in the southeast and high terrain in the northwest, and complex landform. Taihang Mountain in the west is about 1000 meters above sea level, and the terrain is relatively high. The east of Beijing-Guangzhou Railway is a part of North China Plain. According to its origin, the former eastern part belongs to the alluvial plain in front of Taihang Mountain, with an altitude of 30- 100 meters, of which Pompeii village in xinji city is 28 meters above sea level, which is the lowest point in its jurisdiction.

3. Climate

Shijiazhuang city is located in the eastern edge of the Eurasian continent in the middle and low latitudes, close to the Bohai Sea area belonging to the Pacific Ocean, and belongs to the temperate monsoon climate. The seasonal variation of solar radiation is remarkable, with frequent high and low pressure activities on the ground, four distinct seasons, distinct cold and summer, and precipitation concentrated in summer and autumn. The dry-wet cycle is obvious, with long summer and winter and short spring and autumn. It takes about 55 days in spring, 0/05 days in summer, 60 days in autumn and 0/45 days in winter. The annual average humidity of air is 65%. There is little precipitation in spring, and there is often a northerly wind or southerly wind of Grade 4, and the temperature rises rapidly in March and April. In summer, affected by the ocean temperature and humidity airflow, the precipitation in June, July, August and September accounts for 63%-70% of the annual precipitation, and the weather is humid. In the dog days of July and August, the air humidity is as high as 100%. Influenced by Mongolian high pressure in autumn, it is sunny and rainy, with moderate temperature and pleasant climate, with an average air humidity of 78%. In late autumn, there are many northeast winds and cold waves; In winter, influenced by Siberian cold high pressure, northwest wind prevails, the climate is cold, the weather is sunny, and it is cloudy and often snows.

Second, Zhangjiakou

1, location and area

Zhangjiakou is located at11350' ~11630' east longitude and 39 30'~ 42 10' north latitude. It borders Chengde City, Hebei Province in the east, Beijing City in the southeast, Baoding City, Hebei Province in the south, Shanxi Province in the west and southwest, and Inner Mongolia Autonomous Region in the north and northwest. Zhangjiakou City is 289.2 kilometers long from north to south and 2 16.2 kilometers wide from east to west, with a total area of 36,800 square kilometers.

2. Topography

Zhangjiakou city is high in the northwest and low in the southeast, and the yinshan mountains runs through the middle, which divides Zhangjiakou city into two parts: the upper dam and the lower dam. Yanghe and Sanggan rivers in the territory cross the east and west of Zhangjiakou City and flow into Guanting Reservoir. Zhangjiakou belongs to Inner Mongolia-Daxinganling fold system and China-Korea paraplatform, which are two first-class structural units. Inner Mongolia-Daxinganling fold system is a long-term geosyncline from Proterozoic to the end of Paleozoic, which is only distributed in the northern part of Kangbao, with a small range and sporadic exposure.

The development process of China-Korea paraplatform structure can be clearly divided into three stages, reflecting the evolution law of active-stable-active crust. There are 2 deep faults and 7 large faults in Zhangjiakou city.

Magmatic rocks in Zhangjiakou city are relatively developed, with large distribution area and complete rock types. Magmatic rocks * * * have 9 cycles, each cycle starts with extrusive rocks and ends with medium-deep intrusive rocks. There are ultrabasic rocks, basic rocks, intermediate rock, alkaline rocks and acid rocks, and the occurrence of bedrock, dikes, rock plants, rock walls and rock caps is complete.

The strata in Zhangjiakou City are exposed from Archaean to Cenozoic except Upper Ordovician of Lower Paleozoic, Silurian of Upper Paleozoic, Devonian of Mesozoic, Carboniferous, Upper Permian, Triassic and Upper Cretaceous, with a total thickness of 35,978 ~ 51.866m.. The types of stratum rocks exposed in Zhangjiakou City are also complete, including Archean metamorphic rocks, Proterozoic, Paleozoic and Cenozoic sedimentary rocks, contact metamorphic rocks and local dynamic metamorphic rocks around intrusions, and migmatites formed by hypermetamorphism. Magmatic rocks are mainly Mesozoic and Cenozoic extrusive rocks, granites and dikes with different lithology in Lvliang, Hercynian and Yanshan periods.

Zhangjiakou city is divided into two different geomorphic units.

① Bashang Plateau area: It includes Taolizhuang in shangyi county, Langwogou in Zhangbei County, Dushikou in Chicheng County, Guyuan, Kangbao, Shangyi and Zhangbei County to the north of the first line, belonging to the southern edge of Inner Mongolia Plateau, accounting for 1/3 of the total area of Zhangjiakou, with an altitude of about 1.400 meters, high in the south and low in the north, with a specific height of less than 50 meters. Lianggang, Nao Lake and beach land are distributed alternately, showing a typical plateau undulating landform. The hills north of kangbao county form a strip, which is the remaining branch of the yinshan mountains. Along the southern edge of the plateau, there is a ridge with a slightly higher terrain, with an altitude of 1500m or more.

② Zhongshan Basin under the dam: the terrain is high in the northwest and low in the southeast, with undulating mountains and valleys, with an altitude of 1000 ~ 2000m. The main peak of Xiaowutai Mountain in Yuxian County is 2882 meters above sea level, making it the first famous mountain in Hebei Province. Among the mountains, there are large intermountain basins, which are arranged like beads. Mainly: Yanghe basin, Huaizhuo basin, Yuxian basin and Yangyuan basin, with an altitude of 500 ~1000 m. There are rivers in the basin and fertile farmland on both sides.

3. Climate

Zhangjiakou belongs to temperate continental monsoon climate. Its climatic characteristics are: distinct seasons throughout the year, long cold winter; Spring is dry and windy; Summer is hot and short, and precipitation is concentrated; Autumn is sunny, the temperature is moderate, and it is warm and pleasant. Bashang area is rich in light resources and has a large temperature difference between day and night; Rain and heat are in the same season, and the climate is cool during the growing period; High temperature, high humidity and less hot weather. Baxia valley basin is distributed in the central area of Zhangjiakou, and the runoff of Sanggan River and Yanghe River forms Baxia valley basin, with an altitude of 500-800 meters and low terrain. The annual precipitation is 330 ~ 400 mm.