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| 1 | 非浸没式刚性植被群分布对弯道水流的影响显示文摘为分析不同刚性非浸没式植被群分布对弯道水动力特性的影响,采用180°U形折叠往返式水槽模拟天然弯道河流,运用声学多普勒流速仪(ADV)进行测量,通过测量数据计算弯道水流水位、纵向流速分布、湍流动能(TKE)、环流强度以及弥散系数等.结果表明:植被存在情况下水位增高,在植被的“阻滞”作用下,植被区的流速远小于非植被区的流速,但在植被区域和非植被区域之间产生大的流速梯度;植被和弯道都会加剧水流紊动效应,植被区和非植被区交界处的湍流动能最大,且沿弯道出现湍流动能的重分布现象;由于植被对于弯道环流有阻碍作用,使得弯道环流在非植被区很强,而在植被区很弱;植被对横向弥散系数影响较小,非均匀植被对纵向弥散系数影响较大. | 杨彧 林颖典 | 2019 | 华中科技大学学报(自然科学版)2019，47，12： | 4 |
| 2 | 浸没式人工刚性植被群分布对弯道水流特性的影响显示文摘自然弯曲河流中,浸没式植被的存在及分布会改变其水动力特性,进而影响弯曲河道泥沙输移及底床变化。该研究采用180°U形折叠往返式水槽模拟天然弯道河流,木棒模拟刚性植被,运用声学多普勒流速仪(AcousticDoppler Velocimeter, ADV)进行测量,分析不同人工浸没式植被的分布对弯道纵向流速分布、湍流动能(Turbulence Kinetic Energy,TKE),环流强度以及湍流谱分布等的影响。实验结果表明,在植被顶部出现流速的最大值。浸没式植被和弯道都会加剧水流紊动效应,湍流动能最大值出现在植被顶部稍往下区域,且进入弯道以后最大值的位置明显下移。不同的植被群分布使得湍流动能的分布情况不同,凸岸植被减小了无植被区(凹岸)的湍流动能,而凹岸植被增大了无植被区(凸岸)的湍流动能。浸没式植被的存在使得植被区和无植被区的弯道环流方向相反。此外,通过湍流谱分析,植被和弯道都会增强湍流强度,且小湍涡增多;植被与无植被的交界区(横向和垂向)都会增加水体之间的掺混,使得湍流在交界区域明显变强。 | 杨彧 林颖典 | 2021 | 水动力学研究与进展(A辑)2021，36，1： | 3 |
| 3 | Flow characteristics in curved open channel with partial suspended vegetation显示文摘Suspended vegetation in open channels such as natural river,lake,reservoir usually affect the flow structure,causing the change of the water environment,sediment transport,bed deformation.In order to study the water flow behavior in curved open channels under the influence of suspended vegetation,experiments were conducted in a Ushaped flume with 180°bend where the suspended vegetation substituted by cylindrical glass rods were partially placed.The particle image velocimeter(PIV)system was employed to measure the flow velocities of various cases with different vegetation arrangements and roots length.Comparison and analysis were conducted for measured data,such as water level,velocity,head loss,Reynolds stress,and turbulence kinetic energy(TKE)to obtain certain general rules of water flow in open curved channels with suspended vegetation.It can be found from the measured data that the water level and the head loss in the vegetation area are closely related to the arrangements of the suspended vegetation.Furthermore,the drag force of the vegetation can not only lead to smaller increments of longitudinal TKE above the vegetation tail than that below it,but also lead to the flow velocities in vegetation area much smaller than areas without vegetation.In addition,suspended vegetation weakens the vortex strength near the water surface and increases the vortex strength below the vegetation tail,and the flow velocity in the vegetation area has a close relationship with the suspended vegetation length in the water.Therefore,it can be concluded that the reasonable arrangements of suspended vegetation group in curved open channel can protect the concave bank from being scoured,and protect the convex bank from being deposited. | ZHANG Qiao-ling JING He-fang LI Chun-guang WANG Wei-hong ZHANG Wen-sheng | 2022 | Journal of Mountain Science2022，19，9： | 1 |
| 4 | 弯道对植被群河道水流结构影响的试验研究显示文摘为了解弯道对含植被群河道水流结构的影响,本文在180°U型弯道水槽中进行试验,采用圆形竹筷模拟低密度植被群,圆柱体模拟高密度植被群,运用声学多普勒流速仪测量三维流速,不同密度植被群放置于水槽相同位置,对比分析弯道的影响。试验结果发现,植被群上游调整长度及其稳定尾流区长度受弯道影响发生了明显调整,植被群密度的影响仅作用于植被群尾流结构,包括其中垂向湍动能的差异。植被群后出现植被群直径尺度的涡,使纵向湍动能分布出现波峰,峰值大小受弯道影响;植被群在弯道中所处位置越后,峰值越小。湍流谱分析中验证了此现象,并发现弯道作用使得植被群后小尺度涡增多,从而使得植被群后较小湍动能峰值的大小不随植被群放置位置改变。 | 何梦星 林颖典 黄天炜 袁野平 | 2022 | 水力发电学报2022，41，11： | 0 |
| 5 | 竖井弯道段对进出水口水力特性影响研究显示文摘竖井进出水口弯道段(简称竖井弯道段)是控制出流是否均匀的关键体型,若设计不当,易出现偏流等问题。为比较竖井弯道段不同形式(肘型弯道段和S型弯道段)影响竖井进出水口水力特性的异同性,该文建立了大型竖井进出水口试验装置,并利用声学多普勒流速仪量测了出口拦污栅断面流速。研究结果表明:对于出流工况,竖井弯道段对出流均匀性起关键作用,肘型弯道段和S型弯道段均能获得理想的孔口流量分配;竖井弯道段形式的改变不能消除出口拦污栅断面底部负向流速,两种形式弯道段的出口拦污栅断面底部负向流速区高度基本相同;两种弯道段的水头损失相当,均占竖井进出水口水头损失的40%左右。对于进流工况,竖井弯道段对进口拦污栅断面流速分布和孔口流量分配无影响,两种弯道段的水头损失相当,均占竖井进出水口水头损失的60%左右。从水力学角度看,两种形式的弯道段对竖井进出水口水力特性的影响效果基本相同,但S型弯道段形状的细微变化对出流各孔口流量均匀性影响较大,极易导致出流不均匀,需要引起高度重视。 | 朱洪涛 高学平 刘殷竹 王建华 杨喜军 郭芹庆 蒋逵超 | 2022 | 水动力学研究与进展(A辑)2022，37，5： | 0 |
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