• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Arabian Journal for Science and Engineering >Experimental study of flows over Block Ramps on stability of non‑cohesive beds
【24h】

Experimental study of flows over Block Ramps on stability of non‑cohesive beds

机译：砌块坡道流动对非粘性床稳定性的试验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Block ramps are ecofriendly drop structures, which ensure more stability in the downstream riverbed. The scouring in the stilling basin bed material generated by the rapidly varied flow transition affects the stability of the ramp structure. In the present study, a modified stilling basin bed configuration is tested along with the uniform conventional stilling basin bed arrangements to check the stability of non-cohesive beds downstream to block ramps. Uniform non-cohesive horizontal bed configurations and bed with sill arrangement are tested for varying block ramp slopes (20% ≤ i ≥ 30%). The critical particle densimetric Froude number (F_c*) is selected as the criteria to predict the hydraulic conditions for incipient sediment motion in the uniform beds and it is compared with the established literature formulations to estimate the stability of the beds under macroroughness conditions. Scour volumes from each experimental run is quantified and the intensity of sediment motion is determined and related with the critical particle densimetric Froude number. The findings of the paper also describe the effect of F_c* on dimensionless scour depth. Spatial shift in the maximum scour depth formation from the toe of the block ramp for the tested flows over the bed sill arrangement has been observed. Experimental observations and comparison of results show the effect of sill gradation pronounced for non-uniform bed configuration, which effectively reduce the scour depth henceforth it stabilizes the upstream block ramp structure relative to the uniform beds selected.
机译：块坡道是Ecofriendly Drop结构，确保下游河床中的稳定性。由快速变化的流动过渡产生的静脉盆地床材料中的冲洗影响斜坡结构的稳定性。在本研究中，测试改进的静脉盆地床构型以及均匀的传统静脉盆地床布置，以检查下游的非粘性床的稳定性。均匀的非粘性水平床配置和带有窗台布置的床进行测试，用于不同的块斜坡斜坡（20％≤i≥30％）。选择临界粒子的临界粒子弗洛伊特数（F_C *）作为预测均匀床中初始沉积物运动的液压条件的标准，与所建立的文献配方进行比较，以估计叶片在长火条件下的床的稳定性。量化来自每个实验运行的冲刷量，并确定沉积物运动的强度和与临界粒子弗洛伊特数有关。本文的研究结果还描述了F_C *对无量纲冲刷深度的影响。已经观察到，从床铺布置上的测试流的块斜坡的最大冲刷深度形成的空间移位。实验观察和结果的比较表明了对非均匀床构造的主体灰度级的效果，从而有效地减少了所选择的冲刷深度，其稳定上游块斜坡结构相对于所选择的均匀床。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号