Author(s): Dabkowski Szczepan-Ludwik

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Abstract: The flow resistance in sand bed river depends on the effective roughnessof the river channel.The hydraulic roughness is determined by differentfactors in case of flat bed,wavy bed and when bed material is in motion or atrest.Due to bed forms the shape of river banks and geometry of the riverchannel,the effective roughness of beds with sand forms is of littlerelevance to the coarseness of bed sand. Conclusions drawn from the analysis of extensive bibliography concerningthe relation between the resistance to motion and bed forms were formulated bythe author in his work [1989].This work included the description of basicrelief types as well as the analysis of the occurrence of different relieftypes.Due to great diversity and changeability of bed relief, therelationship between the relief and hydraulic resistance,investigated mainlyin flumes,are not similar to those in river channels.Both these factsinduced the author to search for different means to determine thecharacteristics of water flow over sand bed.In this paper the authorpresented the results of an attempt to define the direct relationship betweenthe mean depth_flow and selected characteristics of the channel water flow andbed material.It was assumed that mean depth constitutes the resultant ofinteraction between water flow,bed material and bank characteristics andhydraulic slope.

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Year: 1991