Temporal scour evolution at bridge piers: effect of wood debris roughness and porosity
Temporal scour evolution at bridge piers: effect of wood debris roughness and porosity
复制标题
桥墩的时间冲刷演化：木屑粗糙度和孔隙度的影响
DOI：
10.1080/00221680903568592
复制
发表时间：
2010
影响因子：
2.3
通讯作者：
I. Carnacina
中科院分区：
文献类型：
--
作者：
S. Pagliara;I. Carnacina
洪水搬运的大量木屑会影响桥墩的冲刷形态，从而增加桥梁破坏的可能性。河岸植被的特征尺寸和形状包括碎片表面的各种粗糙度和渗透性条件。二维水流与粗糙堆积物之间的相互作用，增加了水流的剪切应力和紊流度，从而影响桥墩的冲刷演变过程。在意大利比萨大学PITLAB研究中心进行了一项关于桥墩清水冲刷演变的实验研究。碎片堆积的特点是粗糙、形状和孔隙。流动强度的范围从65%到100%的阈值速度，并包括高达18%的总流动面积。水流深度为桥墩直径的2.67至5.67倍。从冲刷时间演变和冲刷形态两个方面分析了木屑粗糙度和孔隙度的影响。
Large wood debris transported by floods affects the scour morphology at bridge piers, thus increasing the bridge failure potential. The characteristic size and shape of the riparian vegetation includes various roughness and permeability conditions of the debris surface. The interaction between two-dimensional flow and rough debris accumulations increases the shear stress, the turbulence and consequently affects the scour evolution process at bridge piers. An experimental study on the bridge pier clear-water scour evolution in the presence of wood debris was conducted at the PITLAB research centre, University of Pisa, Italy. A debris accumulation is characterized by roughness, shape and porosity. Flow intensities range from 65 to 100% of the threshold velocity and included up to 18% of the total flow area. Flow depths were varied from 2.67 to 5.67 times the pier diameter. The effects of wood debris roughness and porosity were analysed in terms of scour temporal evolution and scour morphology.