Stability and scour development of bed material on crossbar block ramps  

作　　者：Mario Oertel Daniel B. Bung 

机构地区：[1]Hydraulic Engineering Section, Liibeck University of Applied Sciences, 23562 Lgbeck, Germany [2]Hydraulic Engineering Section, Aachen University of Applied Sciences, 52066 Aachen, Germany

出　　处：《International Journal of Sediment Research》2015年第4期344-350,共7页国际泥沙研究（英文版）

摘　　要：Block ramps are ecologically oriented drop structures with adequate energy dissipation and partially moderate flow velocities. A special case is given with crossbar block ramps, where the upstream and downstream level difference is reduced by a series of basins. To prevent the total structure from failing, the stability of single boulders within the crossbars and the bed material in between must be guaranteed. The present paper addresses the stability of bed material and scour development for various flow regimes. Any bed material erosion may affect the stability of the crossbar boulders, which in turn can result in major damages of the ramp. Therefore new design approaches are developed to choose an approprriate bed material size and to avoid failures of crossbar block ramp structures.Block ramps are ecologically oriented drop structures with adequate energy dissipation and partially moderate flow velocities. A special case is given with crossbar block ramps, where the upstream and downstream level difference is reduced by a series of basins. To prevent the total structure from failing, the stability of single boulders within the crossbars and the bed material in between must be guaranteed. The present paper addresses the stability of bed material and scour development for various flow regimes. Any bed material erosion may affect the stability of the crossbar boulders, which in turn can result in major damages of the ramp. Therefore new design approaches are developed to choose an approprriate bed material size and to avoid failures of crossbar block ramp structures.

关 键 词：Crossbar block rampScouringBed material erosionParticle densimetric Froude nunlber 

分 类 号：U469.11[机械工程—车辆工程] X53[交通运输工程—载运工具运用工程]