Three-dimensional numerical modeling of the Bulle effect: the nonlinear distribution of near-bed sediment at fluvial diversions

Som Dutta, Dongchen Wang, Pablo Tassi, Marcelo Horacio Garcia

Research output: Contribution to journalArticle

Abstract

The Bulle effect is a phenomenon in which a disproportionately higher amount of near-bed sediment load at a fluvial diversion moves into the diverted channel, even for cases in which the proportion of water (with respect to the main flow) entering the diversion channel is relatively small. This phenomenon has wide-ranging implications for both engineered and natural systems: from efficient design of channels to redirect water and sediment for reclaiming sinking deltas, designing navigational channels that do not need frequent dredging, to morphological evolution of river bifurcations. The first ever, and one of the most extensive set of experiments conducted to explore this phenomenon, were conducted by Bulle in. In the current study the experiments conducted by Bulle have been simulated using an open-source, free-surface finite-element-based hydrodynamic solver. The main objectives were to explore to what extent the complex phenomenon of the Bulle effect at the scale of a laboratory experiment can be simulated accurately using Reynolds-averaged Navier–Stokes (RANS)-based hydrodynamic solver, and to understand the details of the hydrodynamics that Bulle could not analyze through his experiments. The hydrodynamics captured by the simulations were found to match the observations made by Bulle through his experiments, and the distributions of sediment at the diversion predicted by the numerical simulations were found to match the general trend observed in the laboratory experiments. The results from the numerical simulations were also compared with existing one-dimensional models for sediment distribution at bifurcations, and the three-dimensional numerical model was found to perform appreciably better. This is expected due to the complex flow features at the diversion, which can only be captured satisfactorily using a three-dimensional hydrodynamic model.

Original languageEnglish (US)
Pages (from-to)2322-2337
Number of pages16
JournalEarth Surface Processes and Landforms
Volume42
Issue number14
DOIs
StatePublished - Nov 2017

Fingerprint

hydrodynamics
experiment
laboratory experiment
sediment
simulation
modeling
bifurcation
water
dredging
river
distribution
effect
trend

Keywords

  • 3D numerical model
  • Bulle effect
  • asymmetric bifurcation
  • bedload transport
  • fluvial diversions

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Earth-Surface Processes
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Three-dimensional numerical modeling of the Bulle effect : the nonlinear distribution of near-bed sediment at fluvial diversions. / Dutta, Som; Wang, Dongchen; Tassi, Pablo; Garcia, Marcelo Horacio.

In: Earth Surface Processes and Landforms, Vol. 42, No. 14, 11.2017, p. 2322-2337.

Research output: Contribution to journalArticle

@article{05be514a0b184587b0286df9407dabed,
title = "Three-dimensional numerical modeling of the Bulle effect: the nonlinear distribution of near-bed sediment at fluvial diversions",
abstract = "The Bulle effect is a phenomenon in which a disproportionately higher amount of near-bed sediment load at a fluvial diversion moves into the diverted channel, even for cases in which the proportion of water (with respect to the main flow) entering the diversion channel is relatively small. This phenomenon has wide-ranging implications for both engineered and natural systems: from efficient design of channels to redirect water and sediment for reclaiming sinking deltas, designing navigational channels that do not need frequent dredging, to morphological evolution of river bifurcations. The first ever, and one of the most extensive set of experiments conducted to explore this phenomenon, were conducted by Bulle in. In the current study the experiments conducted by Bulle have been simulated using an open-source, free-surface finite-element-based hydrodynamic solver. The main objectives were to explore to what extent the complex phenomenon of the Bulle effect at the scale of a laboratory experiment can be simulated accurately using Reynolds-averaged Navier–Stokes (RANS)-based hydrodynamic solver, and to understand the details of the hydrodynamics that Bulle could not analyze through his experiments. The hydrodynamics captured by the simulations were found to match the observations made by Bulle through his experiments, and the distributions of sediment at the diversion predicted by the numerical simulations were found to match the general trend observed in the laboratory experiments. The results from the numerical simulations were also compared with existing one-dimensional models for sediment distribution at bifurcations, and the three-dimensional numerical model was found to perform appreciably better. This is expected due to the complex flow features at the diversion, which can only be captured satisfactorily using a three-dimensional hydrodynamic model.",
keywords = "3D numerical model, Bulle effect, asymmetric bifurcation, bedload transport, fluvial diversions",
author = "Som Dutta and Dongchen Wang and Pablo Tassi and Garcia, {Marcelo Horacio}",
year = "2017",
month = "11",
doi = "10.1002/esp.4186",
language = "English (US)",
volume = "42",
pages = "2322--2337",
journal = "Earth Surface Processes and Landforms",
issn = "0197-9337",
publisher = "John Wiley and Sons Ltd",
number = "14",

}

TY - JOUR

T1 - Three-dimensional numerical modeling of the Bulle effect

T2 - the nonlinear distribution of near-bed sediment at fluvial diversions

AU - Dutta, Som

AU - Wang, Dongchen

AU - Tassi, Pablo

AU - Garcia, Marcelo Horacio

PY - 2017/11

Y1 - 2017/11

N2 - The Bulle effect is a phenomenon in which a disproportionately higher amount of near-bed sediment load at a fluvial diversion moves into the diverted channel, even for cases in which the proportion of water (with respect to the main flow) entering the diversion channel is relatively small. This phenomenon has wide-ranging implications for both engineered and natural systems: from efficient design of channels to redirect water and sediment for reclaiming sinking deltas, designing navigational channels that do not need frequent dredging, to morphological evolution of river bifurcations. The first ever, and one of the most extensive set of experiments conducted to explore this phenomenon, were conducted by Bulle in. In the current study the experiments conducted by Bulle have been simulated using an open-source, free-surface finite-element-based hydrodynamic solver. The main objectives were to explore to what extent the complex phenomenon of the Bulle effect at the scale of a laboratory experiment can be simulated accurately using Reynolds-averaged Navier–Stokes (RANS)-based hydrodynamic solver, and to understand the details of the hydrodynamics that Bulle could not analyze through his experiments. The hydrodynamics captured by the simulations were found to match the observations made by Bulle through his experiments, and the distributions of sediment at the diversion predicted by the numerical simulations were found to match the general trend observed in the laboratory experiments. The results from the numerical simulations were also compared with existing one-dimensional models for sediment distribution at bifurcations, and the three-dimensional numerical model was found to perform appreciably better. This is expected due to the complex flow features at the diversion, which can only be captured satisfactorily using a three-dimensional hydrodynamic model.

AB - The Bulle effect is a phenomenon in which a disproportionately higher amount of near-bed sediment load at a fluvial diversion moves into the diverted channel, even for cases in which the proportion of water (with respect to the main flow) entering the diversion channel is relatively small. This phenomenon has wide-ranging implications for both engineered and natural systems: from efficient design of channels to redirect water and sediment for reclaiming sinking deltas, designing navigational channels that do not need frequent dredging, to morphological evolution of river bifurcations. The first ever, and one of the most extensive set of experiments conducted to explore this phenomenon, were conducted by Bulle in. In the current study the experiments conducted by Bulle have been simulated using an open-source, free-surface finite-element-based hydrodynamic solver. The main objectives were to explore to what extent the complex phenomenon of the Bulle effect at the scale of a laboratory experiment can be simulated accurately using Reynolds-averaged Navier–Stokes (RANS)-based hydrodynamic solver, and to understand the details of the hydrodynamics that Bulle could not analyze through his experiments. The hydrodynamics captured by the simulations were found to match the observations made by Bulle through his experiments, and the distributions of sediment at the diversion predicted by the numerical simulations were found to match the general trend observed in the laboratory experiments. The results from the numerical simulations were also compared with existing one-dimensional models for sediment distribution at bifurcations, and the three-dimensional numerical model was found to perform appreciably better. This is expected due to the complex flow features at the diversion, which can only be captured satisfactorily using a three-dimensional hydrodynamic model.

KW - 3D numerical model

KW - Bulle effect

KW - asymmetric bifurcation

KW - bedload transport

KW - fluvial diversions

UR - http://www.scopus.com/inward/record.url?scp=85032666027&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85032666027&partnerID=8YFLogxK

U2 - 10.1002/esp.4186

DO - 10.1002/esp.4186

M3 - Article

AN - SCOPUS:85032666027

VL - 42

SP - 2322

EP - 2337

JO - Earth Surface Processes and Landforms

JF - Earth Surface Processes and Landforms

SN - 0197-9337

IS - 14

ER -