Interaction among mean flow, turbulence, bed morphology, bank failures and channel planform in an evolving compound meander loop

Engel, Frank L.; Rhoads, Bruce L.

doi:10.1016/j.geomorph.2011.05.026

Cited by 104 publications

(77 citation statements)

References 64 publications

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“…Field investigations on meandering streams have been carried out for A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 5 decades (e.g., Bridge and Jarvis, 1976;Dietrich and Smith, 1979;Thompson, 1986) and new insights into the fluviomorphological processes on natural meandering streams have been gained continuously as the methods have developed (e.g., Frothingham and Rhoads, 2003;Gautier et al, 2010;Engel and Rhoads, 2012;Kasvi et al, 2013b). However, all of these studies suffer from either a lack of detailed geometric data owing to cross-sectional surveys or from poor temporal resolution of the flow-field data, or both.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

et al. 2015

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Section: Accepted Manuscriptmentioning

confidence: 99%

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

et al. 2015

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“…Its clear advantage is that it can be operated in deep-water rivers, in areas inaccessible on foot but also in shallow areas. These features have led to increased use of ADCPs by researchers, and a wide range of studies exploiting the ADCP and dealing with flow structure and turbulence have been published [18,42,[48][49][50][51][52], some of them focusing on meandering rivers [25,42,49,52]. In most of these studies, however, the 3D flow distribution have been measured along cross-sections and thus the measurements have not covered the whole bend, facing partly similar problems related to the traditional methods [5,49,52].…”

Section: Adcp-principles and Applicationsmentioning

confidence: 99%

“…Various recent studies have exploited modern measurement and modeling techniques such as terrestrial laser scanning [21,22], computational fluid dynamics [21,23,24] acoustic methods [25] and aerial photographs [26] in elucidating sub-bend scale meander dynamics. Due to the improved spatial and temporal resolution, the researchers have been able to highlight the diversity and variability of the fluvial and geomorphological processes that appear in meandering rivers in space and time.…”

Section: Introductionmentioning

confidence: 99%

“…Kasvi et al [21] showed that the influence of a flood on point bar evolution depends on the stage of the bend's development, and that different parts of the point bars experience both erosion and deposition during a flood regardless of the final morphological changes. Engel and Rhoads [25] made important findings related to the processes in natural rivers. They stated that even though bank erosion andchannel migration are governed by near-bank velocity and turbulence, the flow patterns are influenced by the morphological characteristics of the bend, which may vary considerably.…”

Section: Introductionmentioning

confidence: 99%

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Flow Patterns and Morphological Changes in a Sandy Meander Bend during a Flood—Spatially and Temporally Intensive ADCP Measurement Approach

Kasvi

Laamanen²,

Lotsari

et al. 2017

Water

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Abstract:The fluvio-geomorphological processes in meander bends are spatially uneven in distribution. Typically, higher velocities and erosion take place near the outer bank beyond the bend apex, while the inner bend point bar grows laterally towards the outer bank, increasing the bend amplitude. These dynamics maintain the meander evolution. Even though this development is found in meandering rivers independent of soil or environmental characteristics, each river still seems to behave unpredictably. The special mechanisms that determine the rate and occasion of morphological changes remain unclear. The aim of this study is to offer new insights regarding flow-induced morphological changes in meander using a novel study approach. We focused on short-term and small-spatial-scale changes by conducting a spatially and temporally (daily) intensive survey during a flood (a period of nine days) with an ADCP attached to a remotely controlled mini-boat. Based on our analysis, the flood duration and the rate of discharge increase and decrease seems to play key roles in determining channel changes by controlling the flow velocities and depth and the backwater effect may have notable influence on the morphological processes. We discuss themes such as the interaction of inner and outer bend processes and the longer-term development of meander bends.

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“…For instance, Engel and Rhoads [43] evaluated the meanders evolution throughout the time with several campaigns on a specific river, characterizing the bends with the ratios R/B and H/B. Ottevanger et al [41] examined a wide range of topographic configurations (e.g., mildly to sharply curved bends, narrow to shallow bends) confirming that the topography drives the flow redistribution and, specifically, the secondary flow.…”

Section: The Geomorphologic Characterization Of a River Channelmentioning

confidence: 99%

On the Simulation of Floods in a Narrow Bending Valley: The Malpasset Dam Break Case Study

Biscarini

Francesco

Ridolfi

et al. 2016

Water

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Abstract:In this paper, we investigate the performance of three-dimensional (3D) hydraulic modeling when dealing with river sinuosity and meander bends. In river bends, the flow is dominated by a secondary current, which has a key role on the flow redistribution. The secondary flow induces transverse components of the bed shear stress and increases the velocity in outward direction, thus generating local erosion and riverbed modifications. When in river bends, the 3D processes prevail, and a 3D computational fluid dynamics (CFD) model is required to correctly predict the flow structure. An accurate description of the different hydrodynamic processes in mildly and sharply curved bends find a relevant application in meanders migration modeling. The mechanisms that drive the velocity redistribution in meandering channels depend on the river's roughness, the flow depth (H), the radius curvature (R), the width (B) and the bathymetric variations. Here, the hydro-geomorphic characterization of sharp and mild meanders is performed by means of the ratios R/B, B/H, and R/H, and of the sinuosity index. As a case study, we selected the Malpasset dam break on the Reyran River Valley (FR), as it is perfectly suited for investigating performances and issues of a 3D model in simulating the inundation dynamics in a river channel with a varying curvature radius.

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Interaction among mean flow, turbulence, bed morphology, bank failures and channel planform in an evolving compound meander loop

Cited by 104 publications

References 64 publications

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

Sub-bend scale flow–sediment interaction of meander bends — A combined approach of field observations, close-range remote sensing and computational modelling

Flow Patterns and Morphological Changes in a Sandy Meander Bend during a Flood—Spatially and Temporally Intensive ADCP Measurement Approach

On the Simulation of Floods in a Narrow Bending Valley: The Malpasset Dam Break Case Study

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