Coherent Flow Structures at Earth's Surface

ISBN-13: 9781119962779 / Angielski / Twarda / 2013 / 408 str.

Jeremy G. Venditti; James L. Best; Michael Church

Opis

An expert review of recent progress in the study of turbulent flows with a focus on recently identified organized structures.

This book reviews the recent progress in the study of the turbulent flows that sculpt the Earth's surface, focusing in particular on the organized structures that have been identified in recent years within turbulent flows. These coherent flow structures can include eddies or vortices at the scale of individual grains, through structures that scale with the flow depth in rivers or estuaries, to the large-scale structure of flows at the morphological or landform scale. These flow structures are of wide interest to the scientific community because they play an important role in fluid dynamics and influence the transport, erosion and deposition of sediment and pollutants in a wide variety of fluid flow environments. Scientific knowledge of these structures has improved greatly over the past 20 years as computational fluid dynamics has come to play an increasing important part in building our understanding of coherent flow structures across a broad range of scales. Chapters comprise a series of major, invited papers and a selection of the most novel, innovative papers presented at the second Coherent Flow Structures Conference held August 3-5, 2011 at Simon Fraser University in Burnaby, British Columbia. Chapters focus on six major themes:

• Dynamics of coherent flow structures (CFS) in geophysical flows
• Interaction of turbulent flows, vegetation and ecological habitats
• Coherent structure of atmospheric flows
• Numerical modeling of coherent flow structures
• Turbulence in open channel flows
• Coherent flow structures, sediment transport and morphological feedbacks.

Spis treści

List of Contributors, vii

Preface, xi

About the Companion Website, xiii

1 What is a Coherent Flow Structure in Geophysical Flow? 1
Jeremy G. Venditti, Richard J. Hardy, Michael Church, & James L. Best

2 Structure of Turbulent Boundary Layers 17
Ronald J. Adrian

3 Structural Attributes of Turbulent Flow over a Complex Topography 25
Ricardo Mejia–Alvarez, Julio M. Barros, & Kenneth T. Christensen

4 Coherent Flow Structures in the Pore Spaces of Permeable Beds underlying a Unidirectional Turbulent Boundary Layer: A Review and some New Experimental Results 43
Gianluca Blois, James L. Best, Kenneth T. Christensen, Richard J. Hardy, & Gregory H. Sambrook Smith

5 Instabilities in Stratified Shear Flow 63
Gregory A. Lawrence, Edmund W. Tedford, & Jeffrey R. Carpenter

6 Scalar Turbulence within the Canopy Sublayer 73
Gabriel G. Katul, Daniela Cava, Mario Siqueira, & Davide Poggi

7 On the Structure of Wall Turbulence in the Thermally Neutral Atmospheric Surface Layer 97
Michele Guala, Jeff LeHew, Meredith Metzger, & Beverley J. McKeon

8 Critical Reflections on the Coherent Flow Structures Paradigm in Aeolian Geomorphology 111
Bernard O. Bauer, Ian J. Walker, Andreas C.W. Baas, Derek W.T. Jackson, Cheryl McKenna Neuman, Giles F.S. Wiggs, & Patrick A. Hesp

9 Coherent Flow Structures in Vegetated Channels 135
Heidi Nepf, Jeffrey Rominger, & Lijun Zong

10 Coherent Eddy Structures over Plant Canopies 149
Roger H. Shaw, Edward G. Patton, & John J. Finnigan

11 SPIV Analysis of Coherent Structures in a Vegetation Canopy Model Flow 161
Laurent Perret & Tony Ruiz

Blurb

The interaction between flow structure, mobile sediment and surface morphology has become of central importance in understanding the dynamics of the Earth s surface. Additionally, managing such flows is a key component of sustainable engineering design/ construction as well as in the maintenance of ecological habitats. All such flows, in both the atmosphere and in water, and in environments ranging from deserts to rivers to the oceans, are structured across a wide range of spatio–temporal scales, from small–scale turbulent vortices generated at the bed and responsible for grain–motion, to large–scale circulation patterns that generate geomorphic features visible from space.

Coherent Flow Structures at Earth s Surface brings together researchers working on numerical simulation, laboratory modeling and field observation to study coherent flow structures, their interaction with sediment, vegetation, and benthic communities, the manipulation of such flow structures for managing sedimentary environments, and the key role they play in Earth surface dynamics.

Major themes include:

• dynamics of coherent flow structures (CFS) in geophysical flows,
• interaction of turbulent flows, vegetation and ecological habitats,
• coherent structure of atmospheric flows,
• numerical modeling of coherent flow structures,
• turbulence in open channel flows,
• coherent flow structures, sediment transport and morphological feedbacks.