scholarly journals The importance of threshold in alluvial river channel geometry and dynamics

2021 ◽  
Author(s):  
Colin Phillips ◽  
Claire Masteller ◽  
Louise Slater ◽  
Kieran Dunne ◽  
Simona Francalanci ◽  
...  
Keyword(s):  
River Channel ◽  
Channel Geometry ◽  
Alluvial River

scholarly journals River Channel Geometry and Rating Curve Estimation Using Height above the Nearest Drainage

2018 ◽  
Vol 54 (4) ◽  
pp. 785-806 ◽  
Author(s):  
Xing Zheng ◽  
David G. Tarboton ◽  
David R. Maidment ◽  
Yan Y. Liu ◽  
Paola Passalacqua
Keyword(s):  
River Channel ◽  
Rating Curve ◽  
Channel Geometry ◽  
Curve Estimation

scholarly journals Quantifying the combined effects of multiple extreme floods on river channel geometry and on flood hazards

2016 ◽  
Vol 538 ◽  
pp. 256-268 ◽  
Author(s):  
Mingfu Guan ◽  
Jonathan L. Carrivick ◽  
Nigel G. Wright ◽  
P. Andy Sleigh ◽  
Kate E.H. Staines
Keyword(s):  
River Channel ◽  
Combined Effects ◽  
Flood Hazards ◽  
Channel Geometry ◽  
Extreme Floods

Reservoir effects on downstream river channel migration

2000 ◽  
Vol 27 (1) ◽  
pp. 54-66 ◽  
Author(s):  
F. DOUGLAS SHIELDS JR ◽  
ANDREW SIMON ◽  
LYLE J. STEFFEN
Keyword(s):  
Flood Control ◽  
Habitat Type ◽  
River Channel ◽  
Aerial Photographs ◽  
Lateral Migration ◽  
Widespread Application ◽  
Ecosystem Integrity ◽  
Migration Rates ◽  
Alluvial River ◽  
River Floodplains

Human occupation and development of alluvial river floodplains are adversely affected by river channel lateral migration, which may range as high as several hundred metres per year. Reservoirs that reduce the frequency and duration of high flows typically reduce lateral migration rates by factors of 3 to 6. The ecology of riverine corridors is dependent upon the processes of erosion and sedimentation, which lead to lateral migration. Multiple-objective use of floodplains adjacent to active rivers therefore requires tools for assessing the probability and magnitude of channel movements. Existing approaches for predicting river channel movement may be classified as empirical or mechanistic, and are inadequate for widespread application. The Missouri River downstream from Fort Peck Dam in Montana, a major alluvial river with flow highly perturbed by regulation, was selected for case study. Maps and aerial photographs were available before and after dam construction. This imagery was analysed by digitizing channel centrelines at successive coverages under pre-dam and post-dam conditions, and mean migration rates were computed by bend and by reach. The mean rate of channel centreline migration fell from 6.6 m yr-1 to 1.8 m yr-1 after impoundment. Bend-mean channel activity rates were only weakly correlated with variables describing channel form and geometry. Results indicate that flow regulation for flood control and hydropower production typical of the study reach had profound effects on river corridor dynamism, with implications for habitat type distribution and ecosystem integrity.

scholarly journals Changes in floodplain inundation under nonstationary hydrology for an adjustable, alluvial river channel

2017 ◽  
Vol 53 (5) ◽  
pp. 3811-3834 ◽  
Author(s):  
B. C. Call ◽  
P. Belmont ◽  
J. C. Schmidt ◽  
P. R. Wilcock
Keyword(s):  
River Channel ◽  
Alluvial River ◽  
Floodplain Inundation

Observations of riverbed scour under a developing hanging ice dam

2006 ◽  
Vol 33 (2) ◽  
pp. 214-218 ◽  
Author(s):  
Jueyi Sui ◽  
Faye E Hicks ◽  
Brian Menounos
Keyword(s):  
Yellow River ◽  
River Channel ◽  
River Ice ◽  
The Yellow River ◽  
Channel Geometry ◽  
Ice Accumulation ◽  
Field Investigations ◽  
Gauging Station

This paper illustrates the importance of river ice accumulations in changing river channel geometry based on field investigations carried out at the Hequ gauging station on the Yellow River in China. A relationship is established between riverbed deformation and ice accumulation.Key words: river ice, hanging dam, ice accumulation, river scour, Yellow River.

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