Analysis of pool-riffle dynamics through numerical morphological modelling
Analysis of pool-riffle dynamics through numerical morphological modelling
An issue that has puzzled geomorphologists for a long time is the ubiquity and persistence of pool-riffle sequences in rivers over a wide range of slope and substrate conditions. In particular, the mechanisms responsible for the self-maintenance of pools and riffles have been the subject of intense research and controversy. Most of the investigation has focused on inferring the observed morphological dynamics based on some characteristics of both the spatial and temporal variability of the flow, often overlooking intermediate sediment transport processes that are responsible for the link between flow and morphology. The main reason of this omission is the inherent difficulty in measuring and predicting transport variables (e.g. fractional transport, bed grain size distribution) over a range of time and spatial scales, even under controlled laboratory conditions. This paper analyses some important aspects of pool-riffle dynamics through continuous simulations of a coupled unsteady 1D flow-morphology- bed sorting model. The model is used to simulate the evolution of a reach with pools and riffles on the Bear Creek, Arkansas, for a one-year period. Based on the detailed model prediction regarding the time and spatial distribution of fractional sediment transport (bedload by size class), bed composition and topography, some important mechanisms controlling pool-riffle maintenance that so far have been omitted in the literature are unveiled and used to propose a more complete explanation for this phenomenon.
945-952
Bundesanstalt für Wasserbau I
De Almeida, Gustavo
f6edffc1-7bb3-443f-8829-e471b6514a7e
Rodriguez, Jose F.
7d2ce7e6-c404-45da-9a89-5ced480e2039
2010
De Almeida, Gustavo
f6edffc1-7bb3-443f-8829-e471b6514a7e
Rodriguez, Jose F.
7d2ce7e6-c404-45da-9a89-5ced480e2039
De Almeida, Gustavo and Rodriguez, Jose F.
(2010)
Analysis of pool-riffle dynamics through numerical morphological modelling.
In River flow 2010: proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 8 - 10, 2010, Volume 1.
Bundesanstalt für Wasserbau I.
.
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Conference or Workshop Item
(Paper)
Abstract
An issue that has puzzled geomorphologists for a long time is the ubiquity and persistence of pool-riffle sequences in rivers over a wide range of slope and substrate conditions. In particular, the mechanisms responsible for the self-maintenance of pools and riffles have been the subject of intense research and controversy. Most of the investigation has focused on inferring the observed morphological dynamics based on some characteristics of both the spatial and temporal variability of the flow, often overlooking intermediate sediment transport processes that are responsible for the link between flow and morphology. The main reason of this omission is the inherent difficulty in measuring and predicting transport variables (e.g. fractional transport, bed grain size distribution) over a range of time and spatial scales, even under controlled laboratory conditions. This paper analyses some important aspects of pool-riffle dynamics through continuous simulations of a coupled unsteady 1D flow-morphology- bed sorting model. The model is used to simulate the evolution of a reach with pools and riffles on the Bear Creek, Arkansas, for a one-year period. Based on the detailed model prediction regarding the time and spatial distribution of fractional sediment transport (bedload by size class), bed composition and topography, some important mechanisms controlling pool-riffle maintenance that so far have been omitted in the literature are unveiled and used to propose a more complete explanation for this phenomenon.
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Published date: 2010
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Local EPrints ID: 499057
URI: http://eprints.soton.ac.uk/id/eprint/499057
PURE UUID: 67f27969-4e07-4ecd-aef3-1dce50098d0b
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Date deposited: 07 Mar 2025 17:42
Last modified: 08 Mar 2025 02:48
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Author:
Jose F. Rodriguez
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