Vízügyi Közlemények, 1970 (52. évfolyam)
4. füzet - Rövidebb közlemények és beszámolók
INFLUENCE OF SEDIMENT ON BED-MORPHOLOGY By DR. L. IV I С S I С S 1 The bed morphology of watercourses is the resultant of a great number of different factors, such as the regime of flow, the slope of the terrain, the material of the bed and the banks, the plant cover of the banks, the characteristics of vegetation, the ice regime, tectonic movements of the earth's crust, as well as the transportation of suspended sediment and bed-load. Social-economic objectives cannot be attained, unless the influence of natural factors on bed morphology is sufficiently understood. However, in the interest of these objectives it is found frequently insufficient to observe, record and recognize the changes occurring in bed configuration, in many instances bed development, the conveyance of water and ice as well as sediment in the rivers must be controlled artificially. No sound interference can, however, be planned, realized, maintained and operated unless the individual factors affecting the development of watercourses are known and their interrelations understood. Before these interrelations are determined, their nature and character must be explored. The above conclusion applies to sediment and bed-load conditions as well. The water flowing in the stream channels carries in certain cases — e. g"., in some lined artificial channels — no sediment at all, while ^ in other cases — e. g"., in many natural watercourses — both suspended and bed-load are present in the flow. In the general case both water and suspended sediment as well as bed-load move together in the watercourse, and the shape of the channel is more or less modified. The quantities characterizing the movement of water and sediment, further the development of the bed are interrelated and influence each other mutually. The magnitude and changes of any of the three factors is of influence on the other two, the movement of water and sediment and the development of the bed being components of the same phenomenon of Nature. 1 Candidate of Technical Sciences, Research Institute for Water Resources Development, Budapest, Hungary 60
