山地冰川流动模型探讨  

Study of the Ice Flow Models for Alpine Glaciers

作　　者：刘春光[1] 阿布都热西提 刘时银[2] 

机构地区：[1]新疆大学数学与系统科学学院,新疆乌鲁木齐830046 [2]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2012年第4期821-827,共7页Journal of Glaciology and Geocryology

基　　金：国家国际科技合作项目(2010DFA92720-23);中国科学院知识创新工程重要方向项目(KZCX2-YW-GJ04);国家自然科学基金项目(10961024)资助

摘　　要：近30a来冰川动力学模型有了快速发展,在南极、格林兰冰盖预测中取得一系列重要成果,对山地冰川的研究也初见端倪.从冰川流动的力学过程出发,利用本构方程、理想冰川假设、浅冰层近似(Shallow ice approximation)假设完整地推导了理想冰川流动的物理过程,揭示了冰川流动的机理,建立了气候变化和冰川自身重力引起的理想冰川物质和能量再分配的温度耦合三维流动模型.结合山地冰川的冰床形态,将理想冰川与实际冰川相结合,使理想冰川流动模型更好地近似山地冰川的流动.This paper presents a detailed description of ice thickness evolution under climate change by the three dimensional temperature coupled ice flow model through intensive investigation of the mechanism of ice flow which contains internal nonlinear creep and basal sliding.As most of previous works,shallow ice approximation was applied and ideal glacier was proposed.According to specific basal topography of different alpine glaciers,shape factor was introduced to ice deformation to make the model to give more accurate results to a real glacier.The critical limitations of the model and difficulties of it’s applications are thoroughly discussed at the end of this paper.

关 键 词：理想冰川 本构方程 平均水平冰通量 冰川流动模型 长期变化 温度耦合 

分 类 号：P343.6[天文地球—水文科学]