Abstract
Starting from the existing analysis of runoff from the Hotan River, the varying cause of runoff in the Hotan River is analyzed using the annual runoff accumulated curves and the orderly cluster method, pointing out that the runoff from the Hotan River coming from the mountains falls into the natural runoff with the fluctuations because of being subject to climate changes. It is worth noticing that the Xiaota annual runoff flowing into Tarim River was reduced by 0.322 billion m3 in comparison of the postior 1989 series with the prior 1989 series and under the join action by both human being activities and climate changes.
Highlights
Starting from the existing analysis of runoff from the Hotan River, the varying cause of runoff in the Hotan River is analyzed using the annual runoff accumulated curves and the orderly cluster method, pointing out that the runoff from the Hotan River coming from the mountains falls into the natural runoff with the fluctuations because of being subject to climate changes
There is a great deal of glaciers whose area is 10785 km2 where annual precipitation is up to 800mm in the high mountainous area of the Hotan River distributes, so it is the place where runoff generates; in the low mountainous area falling into the hungriness zone, the vegetation is very thin and the velocity of runoff is very high, it is not benefit for the runoff generation without the regulation fluctuation for the runoff supply; in the middle-lower reaches of the Hotan River falling into the transportation area and dissipation area of runoff, the runoff is gradually decreased, even dry, because of water diversion for agricultural irrigation, strong evaporation and seepage loss
The flood season occurs in July and August affected by the temperature and heat in the Hotan River Basin; the runoff highly concentrates in summer, accounting for 80.7%and 72.9%, respectively for the Yulongkashi River and the Kalakashi River; that is very less than 10% in Winter
Summary
The Hotan River is 1127km long whose area is 48870km2 It is the biggest river in the southeast of Tarim Basin and the secondly big river in the north of the Kunlun Mountain. It flows into the Tarim Basin from south to north, comes through the Takelamagan Desert and arrives to the Tarim River. Sand storm and salt-alkalization are three natural disasters in the Hotan Basin; the utilization of soil and water resources is very low. The lower reach of the Hotan River flows through the Takelamagan Desert where vegetation is very thin and big wind and sand storm is very so that its ecological system is very sensitive for the outer effect. The change low of runoff from the Hotan River is studied to develop the local economy, improve the life and protect the environment, etc. under the condition of global climate warming and human activities
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