Characteristics Of Water Isotopes And Hydrograph Separation In The Glacier No.72 Of Qingbingtan,Tomur Peak

Climate warming in cold area of glacial runoff process is an important part of global change research. The influence of climate warming not only caused the glacier basin runoff, but also accordingly changed the structure of runoff. The extensive development of glaciers in arid and semi-arid of alpine region distributes are far away from human settlements. All kinds of water in the basin are less affected by human’s activities, and the impact of water stable isotopes is also small. Its isotopic content and change rules represents the background value in nature. Isotopic content and its change process can more directly on behalf of all the water in the basin hydrology and water chemical characteristics, it’s much better to study water cycle mechanism and evolution process. However, so far, the domestic research for the environment stable isotopes of Tumur Peak is extremely limited. So carry out all the water in the basin of hydrogen and oxygen stable isotopic characteristics of the research is of great significance. It can not only contribute to an understanding of glacial runoff mechanism of water cycle and water sources,research history of mountainous runoff and evolution process of the future, but also provide the scientific basis of adjustment and rational utilization of water resources. This paper is based on the samples of river water, glacier-melt water and precipitation collected at the Glacier No.72 of Qingbingtan in the middle of August 2010, the study discusses the hydrogen and oxygen isotope characteristics and hydrograph separation. The main conclusions were showed as follows.(1)According to analyzing the relationship of the stable isotope characteristics of glacier meltwater, precipitation and the river water, the isotopic values of the glacier meltwater in the basin is relatively stable, and the δ18O values of meltwater ranged from-11.78‰ to-7.1‰ and the δD values ranged from-76.24‰ to-32.11‰.Whereas the variation of precipitation is large, the δ18O values ranged from-10.83‰to-1.34‰, and the δD values ranged from-66.71‰ to-12.45‰. The δ18O values of river water ranged from-10.78‰ to-7.30‰, the δD values ranged from-63.98‰ to-58.29‰, which were basically identical with glacier meltwater. So the rechargesource of glacier No. 72 is dominated by glacier melt water.(2) Through estimating the different water isotope in the study area, we can know that the contribution of glacier meltwater to the Glacier No.72 of Qingbingtan was 78.12%, the contribution of precipitation was 21.88%, respectively in the spring flood, which meant that glacier meltwater was the main supplying water source of streamflow in the Glacier No.72 of Qingbingtan.(3) As the aggravating of the climate anomalies and the global temperature rising,the Glacier No.72 of Qingbingtan melted more intensively than the other areas of Tianshan Mountains. The main recharge source of the river basin is the glacier meltwater. The roles of glacier and snow meltwater should be noticed in water resource management in those glacial regions in south western China.