Author: James P. Bennett
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 46
Book Description
Sediment Transport Simulations for Two Reaches of the Colorado River, Grand Canyon, Arizona
Author: James P. Bennett
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 46
Book Description
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 46
Book Description
Modeling Sediment Transport in Eddy Recirculation Zones of the Colorado River in Grand Canyon
Author: Ryosuke Akahori
Publisher:
ISBN: 9781109960044
Category : Sediment transport
Languages : en
Pages : 206
Book Description
In the Colorado River in Grand Canyon, sandbar beaches are formed beneath recirculation eddies during high floods. Numerous benefits are derived from these beaches including habit for endangered native fish and camping sites for visitors of the national park. The significant reduction in sediment supplied to the Colorado River in Grand Canyon, due to closure of Glen Canyon Dam in 1963, has resulted in significant erosion of these sandbar beaches over time. Currently, sand resources are only supplied from tributary floods. Thus the current strategy of rebuilding sandbars relies on beach formation by simulated floods following tributary inputs of sediment, and by reduction of beach erosion at other times. In November 2004, an experimental flood was released for rebuilding sandbars. This study aims to improve the understanding of sandbar rebuilding mechanisms using numerical models to provide precisely resolved information of flow and sediment transport in a recirculation area, based on the observed data of this flood. A Large Eddy Simulation (LES) model for recirculating flow, which directly integrates the spatially-filtered Navier Stokes equations, is developed and compared to laboratory experiments. Model results are visualized by the lambda2 method that identifies vortex structures. Visualizations of model output show that lateral vortex structures promote inward flow near the reattachment point. Laboratory experiments on the erosion properties of fine-grained Grand Canyon beach deposits show that sediment deposited during the experimental flood is relatively non-cohesive. The LES model is applied to calculate flow and sediment transport during the experimental flood. A particle-based suspended sediment model, using the velocity output from the LES flow model and random fluctuations to account for subgrid scale turbulence, is proposed. Results show that streamwise vorticity in the channel constriction episodically sheds intense vortex structures with vertical vorticity in the main channel. These separated vortex structures then produce intense flow and sediment transport into the reattachment zone. The dynamics of these large episodic vortex structures are critical to understand the process of beach formation in Grand Canyon.
Publisher:
ISBN: 9781109960044
Category : Sediment transport
Languages : en
Pages : 206
Book Description
In the Colorado River in Grand Canyon, sandbar beaches are formed beneath recirculation eddies during high floods. Numerous benefits are derived from these beaches including habit for endangered native fish and camping sites for visitors of the national park. The significant reduction in sediment supplied to the Colorado River in Grand Canyon, due to closure of Glen Canyon Dam in 1963, has resulted in significant erosion of these sandbar beaches over time. Currently, sand resources are only supplied from tributary floods. Thus the current strategy of rebuilding sandbars relies on beach formation by simulated floods following tributary inputs of sediment, and by reduction of beach erosion at other times. In November 2004, an experimental flood was released for rebuilding sandbars. This study aims to improve the understanding of sandbar rebuilding mechanisms using numerical models to provide precisely resolved information of flow and sediment transport in a recirculation area, based on the observed data of this flood. A Large Eddy Simulation (LES) model for recirculating flow, which directly integrates the spatially-filtered Navier Stokes equations, is developed and compared to laboratory experiments. Model results are visualized by the lambda2 method that identifies vortex structures. Visualizations of model output show that lateral vortex structures promote inward flow near the reattachment point. Laboratory experiments on the erosion properties of fine-grained Grand Canyon beach deposits show that sediment deposited during the experimental flood is relatively non-cohesive. The LES model is applied to calculate flow and sediment transport during the experimental flood. A particle-based suspended sediment model, using the velocity output from the LES flow model and random fluctuations to account for subgrid scale turbulence, is proposed. Results show that streamwise vorticity in the channel constriction episodically sheds intense vortex structures with vertical vorticity in the main channel. These separated vortex structures then produce intense flow and sediment transport into the reattachment zone. The dynamics of these large episodic vortex structures are critical to understand the process of beach formation in Grand Canyon.
Modeling of Flood-deposited Sand Distributions in a Reach of the Colorado River Below the Little Colorado River, Grand Canyon, Arizona
Author: Stephen Mark Wiele
Publisher:
ISBN:
Category : Alluvium
Languages : en
Pages : 22
Book Description
Publisher:
ISBN:
Category : Alluvium
Languages : en
Pages : 22
Book Description
U.S. Geological Survey Professional Paper
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Proceedings of the Seventh Federal Interagency Sedimentation Conference, March 25-29, 2001, Reno, Nevada, USA
Author:
Publisher:
ISBN:
Category : Sedimentation and deposition
Languages : en
Pages : 720
Book Description
Publisher:
ISBN:
Category : Sedimentation and deposition
Languages : en
Pages : 720
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1132
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1132
Book Description
Selected Water Resources Abstracts
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 630
Book Description
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 630
Book Description
Computational Fluid Dynamics
Author: Paul D. Bates
Publisher: John Wiley & Sons
ISBN: 9780470843598
Category : Science
Languages : en
Pages : 548
Book Description
Uniquely outlines CFD theory in a manner relevant to environmental applications. This book addresses the basic topics in CFD modelling in a thematic manner to provided the necessary theoretical background, as well as providing global cases studies showing how CFD models can be used in practice demonstrating how good practice can be achieved, with reference to both established and new applications. First book to apply CFD to the environmental sciences Written at a level suitable for non-mathematicians
Publisher: John Wiley & Sons
ISBN: 9780470843598
Category : Science
Languages : en
Pages : 548
Book Description
Uniquely outlines CFD theory in a manner relevant to environmental applications. This book addresses the basic topics in CFD modelling in a thematic manner to provided the necessary theoretical background, as well as providing global cases studies showing how CFD models can be used in practice demonstrating how good practice can be achieved, with reference to both established and new applications. First book to apply CFD to the environmental sciences Written at a level suitable for non-mathematicians
Sediment Delivery by Ungaged Tributaries of the Colorado River in Grand Canyon, U.S. Geological Survey, Water-Resources Investigations Report 00-4055, 2000
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
Book Description
Operation of Glen Canyon Dam, Colorado River Storage Project, Coconcino County
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 454
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 454
Book Description