基于FVCOM的鹤地水库环流特性模拟研究

Circulations in the Hedi Reservoir Based on FVCOM

采用FVCOM模型,考虑径流与风的影响,模拟鹤地水库2013年1月至2014年3月的环流。模拟结果与2014年3月实测流速值符合良好。对比2013年纯径流、不同定常主导风以及2013年实际径流与风场作用下的环流,结果显示:1不同主导风作用呈现出不同环流结构。在NNE风持续作用下,库区呈现出多个较大的逆时针环流,西岸流普遍比东岸流强;而在S、SSE风下,则出现多个逆时针与顺时针环流交替,且东岸流普遍比西岸流强;2在冬半年,径流弱而风力较大情况下,风成为水平、垂向环流作用主导因素;而夏半年,径流较强劲,此时风向多与径流流向相反,水库水平、垂向环流则主要受径流控制;3库区全年平均主要以逆时针环流为主,并形成较强沿岸流,西岸流比东岸流更强。

Considering the influents of both runoff and winds,Circulations in the Hedi reservoir from January 2013 to March 2014 were simulated using FVCOM. Simulated results agree well with the observations during March 2014. Comparisons among the circulations caused by runoff,different dominant winds and both runoff and winds during 2013 showed that： 1 The structure of the circulations changed with the dominant winds. Under the NNE wind,several anti-clockwise circulations were observed,and the west coast flow was stronger than the east coast,while under the S or SSE wind,clockwise and anticlockwise circulations were found at the same time,and the east coastal currents were stronger than the west. 2 During the winter half year,when runoff was weak while winds were stronger,the winds controlled the horizontal and vertical circulations; During the summer half year,when runoff was stronger with reverse winds,the runoff controlled the circulations. 3 The main circulations were anti-clockwise for the whole reservoir in the annually average level,and the coastal currents were strong,especially,the west coast currents.