Structure and Resistance Characteristics of Water Flow in Open Channels with Rigid Ecological Floating Beds
Ecological floating beds are frequently employed in urban river sanitization projects,although their design alters the original river sections water flow structure,increases water flow resistance could decrease the river's flood dis-charge capacity.There is currently little quantitative study on the adjustments in water flow resistance brought on by floating beds,with the majority of studies analyzing the hydrodynamic properties of floating beds.This article uses flume experiments to investigate the effects of rigid floating bed plants on the cross-sectional flow structure of flume under three different submergence depths(10 cm,20 cm,30 cm)and two different arrangement styles.This study adds the floating bed resistance term based on the equivalent cross-section principle to solve the total roughness of the floating bed coverage area and the additional roughness of rigid plants because the traditional Manning formula cannot be used to solve the roughness coefficient of the floating bed coverage area directly.The findings indicate that the floating bed's water-blocking effect increases with increasing submergence depth;Water flow resistance is increased more by staggered arrangement than by parallel arrangement.The comprehensive roughness of the cross-section of rigid floating bed plants under parallel arrangement conditions is 0.381-0.417 while it is 0.397-0.427 under staggered arrangement.The plant submersion depth and arrangement strategy both affect comprehensive roughness of cross-sections.
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NSTL
万方数据
维普
