Glacial Runoff Likely Reached Peak in the Mountainous Areas of the Shiyang River Basin,China  

作　　者：ZHANG Shi-qiang GAO Xin Zhang Xiao-wen 

机构地区：[1]College of Urban and Environmental Sciences, Northwest University [2]State Key Laboratory of Cryospheric Science, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences [3]The Resource Environment & Urban and Rural Planning Department, Lanzhou Commercial College

出　　处：《Journal of Mountain Science》2015年第2期382-395,共14页山地科学学报（英文）

基　　金：supported by the Global Change Research Program of China (Grant No. 2013CBA01806);the China National Natural Science Foundation (Grants Nos. 41130641, 41130638, and 41271090);Shanxi key science and technology innovation team (2014KCT-27)

摘　　要：Glacier runoff in mountain areas of the Shiyang River Basin(SRB), Qilian Mountain, western China is important for the river and water supply downstream. Small glaciers with area of less than 1km2 are dominant(87%) in the SRB. A modified monthly degree-day model was applied to quantify the glacier mass balance, area, and changes in glacier runoff in the SRB during 1961–2050. The comparison between the simulated and observed snow line altitude, annual glacier runoff, and mass balance from1961 to 2008 suggests that the degree-day model may be used to analyze the long-term change of glacier mass balance and runoff in the SRB. The glacier accumulation shows a significant(p<0.01) decreasing trend of-0.830 mm a-1. The mass balance also shows a significant(p<0.01) decreasing trend of-5.521 mm a-1. The glacier total runoff has significantly(p<0.05)increased by 0.079 × 105 m3 from 1961 to 2008. The monthly precipitation and air temperature are projected to significant(p<0.005) increase during2015 to 2050 under three different scenarios. The ablation is projected to significant(p<0.001) increase,while the accumulation has no significant(p=0.05)trend. The mass balance is projected to decrease, theglacier area is projected to decrease, and the glacier runoff depth is projected to increase. However, the glacier total runoff is projected to decrease. These results indicate that the glacier total runoff over glacier areas observed in 1970 reached its peak in the 2000 s. This will exacerbate the contradiction between water supply and downstream water demands in the SRB.

关 键 词：Climate change Mass balance Glacial runoff Glacier area Shiyang River Basin 

分 类 号：P343.6[天文地球—水文科学] TV213.4[天文地球—地球物理学]