IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Impact of sediment cohesion by root systems on river channel formation
Impact of sediment cohesion by root systems on river channel formation
Author : TOMONORI NAGATA (1), YASUHARU WATANABE (2) & JUNGO FUNAKI (3)
Riparian woods have grown thickly and extensively at many places across Japan, and the current river environment is substantially different from what it was several decades ago (Figure 1). Because the riparian woods that have grown excessively disturb the flow of water during floods and also cause a significant change in the river environment, impacts of the excessive tree growth on flood control and river ecosystem have become issues of concern. It is known that flood control by means of dams, reductions of river widths due to river improvement works, and other factors have led to thick and extensive growth of riparian woods, but the process and the dominant factors of such growth have not been fully elucidated. In this connection, a vegetation prevalence model was developed in this study. This model takes into account the existence/non-existence of vegetation (i.e., willows) and the resistance of willows above ground and their root systems to flowing water and sediment transport at different tree growth stages. The growth increment regarding various parts of a willow tree is estimated on the basis of the tree age. In the vegetation prevalence model, willows' resistance to flowing water and sediment transport is varied with time to simulate each growth stage. The vegetation prevalence model was incorporated into a riverbed evolution analysis model for analyzing the mechanism and the contributing factors of thick and extensive vegetation growth.
File Size : 1,962,478 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 01/10/2015
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