What's the geographical environment like in Dunhuang, Gansu?

Dunhuang, a county-level city in Gansu Province, managed by Jiuquan City, is located at the westernmost end of Hexi Corridor, where Gansu, Qinghai and Xinjiang provinces (regions) meet, with a total area of 3. So what is the geographical environment of Dunhuang in Gansu?

1, location. Dunhuang City is located in the northwest of Gansu Province, which is connected with Guazhou County, Subei Mongolian Autonomous County and Aksai Kazak Autonomous County in the east and west respectively. Dunhuang is located at the intersection of Gansu, Qinghai and Xinjiang provinces, with Sanwei Mountain in the east, Mingsha Mountain in the south, the desert connected with Lop Nur in the west, Gobi in the north and the remaining veins of Tianshan Mountain. It is located between 9213'-95 30' east longitude and 39 40'-4140' north latitude, with a total area of 3120,000 square kilometers, of which the oasis area 1400 square kilometers only accounts for 4.5% of the total area.

2. Terrain: Dunhuang is high in the north and south, low in the middle, inclined from southwest to northeast, with an average elevation of 1 139 meters. There are three dangerous mountains in the east, Mingsha Mountain in the south, desert in the west, connected with Taklimakan, Gobi in the north and connected with the remaining veins of Tianshan Mountain.

3. Climate characteristics. Dunhuang is a typical warm temperate arid climate with dry climate, less rainfall, large evaporation, large temperature difference between day and night and long sunshine time. Four distinct seasons, warm and windy in spring, hot in summer, cool in autumn and cold in winter. The annual sunshine hours are 3246.7 hours, the annual average precipitation is 42.2 mm, the evaporation is 2505 mm, the annual average temperature is 9.9℃, the highest temperature is 465438 0.7℃, and the lowest temperature is -30.5℃. The annual average frost-free period is 152 days.

4. Hydrological survey. There are Danghe River, Xishuigou, Dongshuigou and Nanhu Springs in Dunhuang City, with an annual runoff of 62 million cubic meters. Danghe River originates from Qilian Mountain, with a total length of 390 kilometers, a drainage area of 1.68 square kilometers and an annual runoff of 302 million cubic meters.

5. Natural disasters. 2065438+April 23, 2004, due to the joint influence of strong cold air in Xinjiang and ground cold air, a sandstorm weather occurred in Dunhuang City, Gansu Province, with the minimum visibility less than 20m and the maximum wind speed18.5m/s. ..

All of the above are about the geographical environment of Dunhuang in Gansu.