滩地种植一排植物的复式河道流速分布计算方法研究  

Modeling Overbank Flows in Compound Channel with One- lineVegetation

作　　者：蒋北寒 侯极[1] 杨克君[1] 曹叔尤[1] 陈梁 郭志学[1] 

机构地区：[1]四川大学水力学及山区河流开发保护国家重点实验室,四川成都610065 [2]云南金沙江中游水电开发有限公司,云南昆明650228

出　　处：《四川大学学报（工程科学版）》2014年第1期54-60,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51279117;50709021);全国博士学位论文作者专项资金资助项目(201051)

摘　　要：基于SKM方法和结合二次流的运动特性,提出了滩地种植一排植物的复式河道流速分布的计算方法。结果表明:二次流对复式断面水流具有重要的影响,忽略二次流项将给计算结果带来很大误差,预测值甚至达到计算值的两倍;传统区域划分法能够预测断面流速分布趋势,但计算结果误差较大;在主槽区的前半段和滩地区的后半段,计算值要小于实测值,在主槽区的后半段则相反。结果表明,通过考虑二次流的影响和增加子区域的划分数,提出的方法可以更好地预测流速分布,其流速分布更符合实际情况。Based on the Shiono and Knight method （SKM） and the secondary flow motion characteristics, the determination of the lateral distribution of depth-averaged velocity in compound channels with one-line vegetation along the edge of the floodplain was proposed. The results showed that there is large disagreement between the computed results and the experiment data, especially in the main channel, when the secondary flow is ignored. When using the traditional divisions of sub-region, the prediction doesn＇ t largely agree with the ex- periment data. However, the results showed that by considering the effect of secondary flow, increasing the division of sub-regions and adjusting the available parameters for each region, the proposed method can be capable of predicting the lateral distributions of depth- averaged velocity in this type of channel.

关 键 词：一排植物 复式河道 二次流 区域划分 流速分布 

分 类 号：TV133.1[水利工程—水力学及河流动力学]