scholarly journals Channel adjustments to a succession of water pulses in gravel bed rivers

2015 ◽  
Vol 51 (11) ◽  
pp. 8773-8790 ◽  
Author(s):  
Carles Ferrer‐Boix ◽  
Marwan A. Hassan
Keyword(s):  
Gravel Bed ◽  
Water Pulses ◽  
Channel Adjustments ◽  
Gravel Bed Rivers

scholarly journals Can gravel augmentation restore thermal functions in gravel-bed rivers? A need to assess success within a trajectory-based BACI framework

2020 ◽  
Author(s):  
Baptiste Marteau ◽  
Kristell Michel ◽  
Hervé Piégay
Keyword(s):  
River System ◽  
Sediment Supply ◽  
Global Changes ◽  
Fundamental Parameter ◽  
Positive Feedbacks ◽  
Gravel Bed ◽  
Channel Adjustments ◽  
Gravel Bed Rivers ◽  
Term Monitoring

Gravel augmentation has become common practice to mitigate the effects of decline in upstream sediment supply in gravel-bed rivers. The success of such rehabilitation schemes relies partly on the monitoring strategy and efforts. When long-term monitoring is lacking, some aspects of rehabilitation initiatives suffer more than others, such as insights into functions and functionalities of the river system. Despite temperature being a fundamental parameter determining the general health of river ecosystems, a limited number of studies have tested whether gravel-augmentation can aid restoring thermal functions. With the help of airborne thermal infrared (TIR) imagery, this paper explores the potential positive feedbacks through the monitoring of gravel augmentation actions, of different magnitude, taken on 3 rivers of the Rhône basin in France. A specific trajectory-based Before-After-Control-Impact (BACI) framework using simple indicators, combined with a TIR-based Control-Impact strategy, was designed to assess the success of thermal function restorations based on dynamic fuzzy references. Results indicate that restoring forms is not sufficient to restore thermal functions. The control-impact strategy shows limitations in the sense that two neighbouring reaches can display similar planform characteristics but different thermal functions; what is observed in a control reach should not necessarily be expected following rehabilitation. When assessing thermal processes, a before-after strategy is needed to either serve as a target or help define an adequate target in accordance with changes in the catchment and channel adjustments and responsiveness. We therefore recommend a trajectory-based BACI assessment to identify current biogeophysical conditions within which rehabilitation can be assessed. From a technical perspective, airborne TIR proved to be useful to rapidly map surface temperature over dozens of kilometres at high resolution, and can be advocated as a powerful tool to monitor and diagnose thermal functions of gravel-bed rivers. With an increasing number of rehabilitation schemes, and increasing pressure of global changes on rivers, we suggest that monitoring of water temperature, even with simple but well-designed sampling strategies, becomes a routine part of river rehabilitation projects.

Channel adjustments and alteration of sediment fluxes in gravel-bed rivers of North-Eastern Italy: potentials and limitations for channel recovery

2009 ◽  
Vol 25 (5) ◽  
pp. 551-567 ◽  
Author(s):  
Nicola Surian ◽  
Luca Ziliani ◽  
Francesco Comiti ◽  
Mario A. Lenzi ◽  
Luca Mao
Keyword(s):  
Sediment Fluxes ◽  
Gravel Bed ◽  
Channel Adjustments ◽  
North Eastern ◽  
Gravel Bed Rivers

Comparing gravel-bed rivers in paired urban and rural catchments of southeastern Pennsylvania

Geology ◽  
2000 ◽  
Vol 28 (1) ◽  
pp. 79-82 ◽  
Author(s):  
J. E. Pizzuto ◽  
W. C. Hession ◽  
M. McBride
Keyword(s):  
Gravel Bed ◽  
Gravel Bed Rivers

UNRAVELLING THE ROLE OF VEGETATION IN THE AVULSION HISTORY OF GRAVEL-BED RIVERS

2018 ◽  
Author(s):  
Daniel Donahue ◽  
◽  
José Antonio Constantine ◽  
Gregory B. Pasternack
Keyword(s):  
Gravel Bed ◽  
History Of ◽  
Gravel Bed Rivers

Unobstructed and Obstructed Turbulent Flow in Gravel Bed Rivers

2005 ◽  
Vol 131 (8) ◽  
pp. 635-645 ◽  
Author(s):  
Hans M. Tritico ◽  
Rollin H. Hotchkiss
Keyword(s):  
Turbulent Flow ◽  
Gravel Bed ◽  
Gravel Bed Rivers

scholarly journals Critical specific stream power in gravel-bed rivers

Geomorphology ◽  
2005 ◽  
Vol 69 (1-4) ◽  
pp. 92-101 ◽  
Author(s):  
F. Petit ◽  
F. Gob ◽  
G. Houbrechts ◽  
A.A. Assani
Keyword(s):  
Stream Power ◽  
Gravel Bed ◽  
Gravel Bed Rivers
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