冰盖下水流速度分布的二维数值模拟分析  

The Simulation of Flow Velocity Profile under Ice Cover

作　　者：王军[1] 付辉[2] 伊明昆[3] 孙晓艳[1] 陈胖胖[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]中国水利水电科学研究院,北京100038 [3]安徽省水利水电勘测设计院,安徽合肥230022

出　　处：《冰川冻土》2009年第4期705-710,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(10372028);合肥工业大学校博士基金项目(200804178871)资助

摘　　要：基于标准的k-ε模型,利用有限体积法,对冰盖下水流速度分布进行了二维数值模拟和分析.结果表明:当冰盖和河床糙率比值变化时,水流速度剖面发生变化;冰盖下的最大流速值比速度对称分布时要大,且偏于光滑的一边;在相对光滑壁处近壁流速值大于相应对称分布时的流速值,该结果与实验室实测速度剖面情况吻合.数值试验表明,最大流速点位置的偏移量仅在有限的范围内,冰盖区、床面区及冰盖下水流平均速度相差较小,表明了工程应用中假定各区流速相等是可行的.A model is used to simulate the velocity profile under ice cover based on finite volume method.The results indicate that velocity profile varies with the ratio of roughness of ice cover and bed.When the roughness of ice cover and bed are not equal,the maximum velocity becomes large and moves to the less rough side.However,the range of maximum velocity moving is in a limited distance only.The difference of average velocities in ice-covered area,bed-affected area and under-ice area is on the small side,showing the feasibility of assuming that the velocities in all areas are the same.

关 键 词：冰盖 水流速度分布 粗糙度 偏移 数值模拟 

分 类 号：P334.92[天文地球—水文科学]