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首页> 外文会议>IAHR World Congress >STUDY OF BREACH CHARACTERISTICS AND SCOUR PATTERN FOR OVERTOPPING INDUCED RIVER DYKE BREACH
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STUDY OF BREACH CHARACTERISTICS AND SCOUR PATTERN FOR OVERTOPPING INDUCED RIVER DYKE BREACH

机译：漏洞特征及初探河流堤防漏洞的冲刷模式研究

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Every year flood discharge induced overtopping flow through river dykes causes large damage to society, the environment and infrastructure. Although several researches have been conducted to understand embankment dam failure, there has been little focus on river dyke breaches. The dynamic lateral widening of the breach process, resulting flow and sediment hydrographs and the scour beneath or downstream of dyke are poorly understood. Therefore, elaborate laboratory tests were conducted to investigate the dynamic lateral widening process, breach characteristics and scour process. The experimental model is constructed in Ujigawa open laboratory, DPRI, Kyoto University, Japan. The 1m long and 15cm high homogenous non-cohesive dyke is prepared along the 4m long river flume placed parallel to the river flow and a small pilot channel is made at the center of the dyke to initiate the widening process. The entire process was recorded optically using video and three-dimensional cameras for detailed analysis of the breaching phenomena and the discharge of flow and sediments are measured downstream of dyke by collecting box method. For the determination of scour process, the foundation and the downstream bed are also made movable and equilibrium scour patterns are observed for two scenarios by laser measurement. The result indicates the important effect of particle size on the dynamic lateral widening process, breach discharge and the scour pattern. The result shows the impact of particle size on the widening process, resulting hydrograph and scour pattern. Finer Sediment sizes show resistance to erosion and failure as well as higher scour at the foundation whereas coarser particles show opposite characteristics. The maximum scour depth is seen to follow approximately linear relation with the sediment size and the location of such scour is observed within the center of dyke towards the toe.
机译：每年洪水排放引起河流堤坝的拓扑流量会对社会，环境和基础设施造成大量损害。虽然已经进行了几项研究以了解堤防坝衰退，但在河堤泄露时几乎没有焦点。突发过程的动态横向加宽，产生的流动和沉积物文照片和堤坝下游或下游的冲刷都很清楚。因此，进行了精细的实验室测试，以研究动态横向加宽工艺，违规特征和洗涤过程。实验模型是在日本京都大学DPRI的Ujigawa公开实验室构建。沿着与河流平行的4M长的河流制备1米长和15cm高均匀的非粘性堤防，并且在堤坝的中心制作小型飞行通道以启动加宽工艺。使用视频和三维相机进行光学地记录整个过程，以便通过收集盒法测量突发现象的详细分析，流动和沉积物的放电测量。为了确定冲刷过程，基础和下游床也是通过激光测量来观察到两个场景的可移动的，并且通过激光测量来观察到平衡冲刷图案。结果表明粒度对动态横向加宽工艺，突破性排放和冲刷图案的重要作用。结果表明粒度对加宽过程的影响，导致水力照片和冲刷图案。更精细的沉积物尺寸显示出对侵蚀和失败的抵抗力以及基础的更高的冲刷，而粗颗粒显示相反的特征。看到最大冲刷深度与沉积物尺寸大致线性关系遵循近似线性关系，并且在脚趾的堤防中心观察到这种冲刷的位置。

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