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.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Investigating the role of fish rocks on the movement of sand over gravel bed rivers
Investigating the role of fish rocks on the movement of sand over gravel bed rivers
Author : A.N. (Thanos) Papanicolaou, M. Elhakeem, D. Dermisis and A. Tsakiris
In this study detailed flume experiments were conducted to examine the effects of an array of partially submerged fish rocks on sand movement over gravel bed rivers. The experimental results revealed the formation of a newly reported in the literature bed morphological feature, namely a funnel shaped “sand ridge” upstream of the fish rock array region, and small depositional sand patches in the stoss of the individual rocks. The formation of these bed features led to the reduction in the incoming bedload rate by a factor of ~ 5.0 – 20. A mass balance sediment analysis revealed that ~ 63 % and 14 % of the eroded material deposited upstream of the fish rock array region depending on the applied bed shear stress conditions. Flow measurements in the vicinity of the rocks re-confirmed the linkage between flow and sediment depositional patterns around the rocks. The findings of this research may have ramifications in stream restoration projects for the design of engineered riffle sections installed to improve degraded waterways and aquatic habitat.
File Size : 2,235,089 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
Download Now