摘要
为探究雅鲁藏布江奴下水文站以上流域在气候变化背景下的冰川融水规律,基于研究区数字高程模型(DEM)、冰川资料和气温数据,采用虚拟冰川法概化流域冰川,分析冰川面积沿高程分布规律,再利用度日模型分析冰川融水量的时间、高程变化。结果表明:(1)海拔5000~6300m之间是研究区内冰川的集中发育带,气温和山地面积对冰川面积的影响分别体现在6500m以下和5700m以上。(2)选取区域度日因子9.1mm·d^(-1)℃^(-1),气温直减率0.75℃/100m,1976~2015年冰川融水量呈现出小幅增加-小幅减少-大幅增加的趋势,年均冰川融水量为79.58×10^(8)m^(3)。(3)各高程处的冰川融水量受到气温和冰川面积的共同影响,海拔5300m处的多年冰川融水量最大。
In order to explore the glacier meltwater patterns in the basin above Nuxia station of Yarlung Zangbo River under the background of climate change,based on the digital elevation model(DEM),glacier data and temperature data in the study area,this paper applied the virtual glacier method to generalize the glaciers in the basin,and analyzed the distribution pattern of glacier area along the elevation,and then explained the temporal and elevation changes of glacier meltwater volume by using the degree-day model.The results show that:(1)The area between 5000 and 6300m above sea level is the concentrated development zone of glaciers in the study area.The effects of temperature and mountain area on the glacier area are reflected below 6500 m and above 5700 m,respectively.(2)With the regional degree day factor of 9.1 mm·d^(-1)℃^(-1) and the temperature lapse rate of 0.75℃/100 m,the glacial meltwater volume from 1976 to 2015 showed a trend of small increase-small decrease-large increase,with an average annual glacial meltwater volume of 7.958 billion m^(3).(3)The amounts of glacial meltwater at different elevation are influenced by a combination of temperature and glacier area,with the greatest amount of multi-year glacial meltwater occurring at 5300 m above sea level.
作者
萧峻琼
郝洁
鞠琴
章晓梦
次旦多杰
陈玺
郝振纯
XIAO Junqiong;HAO Jie;JU Qin;ZHANG Xiaomeng;CIDAN Duojie;CHEN Xi;HAO Zhenchun(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210024,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Linzhi Branch of the Tibet Autonomous Region Hydrology Bureau,Linzhi 860000,China;Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,China)
出处
《水文》
CSCD
北大核心
2021年第6期79-84,共6页
Journal of China Hydrology
基金
国家重点研发计划资助项目(2021YFC3201104)
国家自然科学基金资助项目(52179013)
“一带一路”水可持续发展科技基金资助项目(2020490811)。
关键词
气候变化
气温直减率
度日模型
冰川融水量
虚拟冰川法
climate change
temperature lapse rate
degree-day model
glacier meltwater volume
virtual glacier
