Hotan special

In Hotan area, Kunlun Mountain in South Vietnam reaches the northern Tibetan Plateau, bordering Tarim Basin in the north, low in the north and high in the south, and gently inclines from west to east. The terrain rises from the northern elevation of1050m to the southern mountain elevation of 7167m. Mountain area, mountain area and northern plain area are clearly defined and roughly divided into basin and mountain area. Oasis covers an area of 9730 square kilometers. The Kunlun Mountain in the south of Hotan region is curved across the east and west, with overlapping peaks and steep mountains. The northern slope is a low mountainous area with shallow hills and canyons, while the southern slope is gentle. The highest peak of the mountain range is generally around 6000 meters above sea level, and the highest is over 7000 meters. Due to the dry climate, the height of the desert is generally 3300 meters, and in some areas it can reach 5000 meters. The snow lines on the north and south slopes are above 6000m and 5500m respectively. Linqitang Depression was formed at the geographical boundary between Kunlun Mountain and Karakorum Mountain, and modern salt lakes and saline-alkali swamps developed, forming alpine lakes.

2, climate characteristics:

There are sandstorms and floating dust in spring, and it is hot and dry in summer. The average annual precipitation is 35 mm, and the annual evaporation is 2480 mm There are many sandstorms in four seasons, and there are more than 220 days of sandstorms every year, including about 60 days of thick floating dust (sandstorm). The average number of floating dust days in Hotan increases by 2.5 days per year. There is no first-class or second-class weather, with 28 days of third-class or fourth-class weather and about 300 days of fifth-class weather, and the average monthly dust fall 124 tons/square kilometer.

3. The characteristics of water resources:

The average annual runoff of surface water in Hotan area is 7.3352 billion cubic meters. Among them, the runoff in Pishan inner flow area is 706.5 million cubic meters, that in Hemo-Luonei flow area is 4,509.4 million cubic meters, and that in Qira-Yutian-Minfeng inner flow area is 265,438+193,000 cubic meters. In addition, there are 943 million cubic meters of water resources in Liu Hu area of Qiangtang Plateau. Yulong Kashi River and Karakash River account for 6 1.2% of the total water volume of all rivers in the region.