内河岸线调整长度对顺直河道的行洪影响  

The Influence of Inland Rivers Water-front Length Adjustment to Draining Flood of Straight River Channel

作　　者：李彬[1] 郑国栋 

机构地区：[1]中水北方勘测设计研究有限责任公司,天津300222 [2]浙江贵仁信息科技股份有限公司,浙江杭州310053

出　　处：《人民珠江》2017年第8期54-58,共5页Pearl River

基　　金：广东水利科技创新项目(2012-06)

摘　　要：针对内河岸线调整长度对顺直河道行洪影响的问题,采用概化非恒定流模拟了河道拓宽比为0.30的顺直河道调整不同长度岸线后的河道行洪情况,从水面线、槽蓄量、分流比和水流流态等方面分析了其对顺直河道行洪的影响。结果表明:(1)岸线调整长度增加,岸线调整区槽蓄量增加,岸线调整区分流比最小值与其极限值越接近;(2)岸线调整区对水面线起到沿程先降低后抬高、再降低再抬高的作用,存在不抬高河道水位的临界岸线调整长度与河宽比;(3)河道水位抬高最大值随着岸线调整长度的增加先增大后减小,存在最大程度抬高河道水位的岸线调整长度与河宽比,河道水位抬高影响范围和水位抬高最大值均很小,主要集中在岸线调整区局部河段;(4)分析河段水流运动受岸线调整区进口"突扩"作用、出口"突缩"作用和岸线调整区槽蓄作用的共同影响。综上,可采用退堤的方式增加河道行洪能力,但需注意其对河道局部水位的抬高影响。Aiming at the influence of inland rivers water - front length adjustment to draining flood of straight river channel, this paper used generalized unsteady flow to simulate the draining flood condition with different water - frontlength which was 0.30 broadening ra- tio of straight river channel, and analyzed the influence of flow profile, water - storage capacity, flow rate, flow rate and so on. The simulation result showed that： （~water - front adjustment length was increased, water - storage capacity at water - front adjustment re- gion was increased, and the minimum value of water - front adjustment region flow rate was closed to its ultimate value. （~）water - front adjustment region causes flow profile raise, reduce, raise and reduce along the way, it had a ratio of water - front adjustment length and river width without increasing. （~The maximum of river water level increased first and then decreased with the increase of water - front adjustment length, and it had the ratio of water - front adjustment length and river width, which increased maximum water level. The influence area and maximum of increasing water level were small, and they were mostly concentrated on some reaches of water - front adjustment region. （~）River flow motion is influenced by sudden enlargement of water - front adjustment region entrance, sudden con- traction of water - front adjustment region exit and water - storage of water - front adjustment region. To sum up, annealing embankment could improve the draining flood capacity for river channel, but influence of water level increasing must be noticed.

关 键 词：岸线调整长度 非恒定流 行洪影响 水面线 槽蓄量 分流比 水流流态 MIKE21 

分 类 号：TV133.2[水利工程—水力学及河流动力学]