[PDF] Morphological Response Of Sand Bed Streams To Unsteady Flow Events eBook

Author : Etta Haley Gunsolus
Publisher :
Page : 316 pages
File Size : 42,46 MB
Release : 2015
Category :
ISBN :

GET BOOK

Changes in riverine discharge, such as those due to reservoir flushing, seasonal variation or extreme precipitation, can alter sediment transport rates and morphology of the stream bed. Experimental laboratory research investigated the effect of unsteady flow event hydrographs on stream bed morphological response. Laboratory experiments were conducted in a 5.0 mlong sediment transport flume with a bed comprised of a medium sand. Experimental hydrographs were composed of antecedent (base-flow), unsteady event (flood) and post-flood (return to base-flow) stages. Three distinct series of experimental laboratory runs were conducted to systematically investigate the effect of three characteristics of unsteady flow event hydrographs. Series A investigated the effect of the magnitude of the unsteady flow event hydrograph; Series B investigated the effect of the duration of the event; and Series C investigated the effect of the hydrograph shape (i.e., time-to-peak flow). Bed morphological adjustments, sediment transport rates and the composition of the sediment in transport were measured throughout all stages of the experimental runs. Measured values were compared to predicted values calculated using traditional sediment transport and bed form geometry equations assuming steady flow conditions. In general, predicted values greatly underestimated both measured values of sediment transport and bed form geometry. Results show that systematic changes in the magnitude, duration and time-to-peak flow of the unsteady hydrograph cause varying types of hysteresis (clockwise or counter-clockwise) of the sediment transport rates which has a considerable effect on the subsequent bed morphological adjustments. Shorter duration and symmetrical hydrographs exhibit counter-clockwise hysteresis while longer duration and asymmetrical hydrographs exhibit clockwise hysteresis. Results from this thesis have made considerable contributions towards evaluating the effects of unsteady flow event hydrograph characteristics to improve numerical modelling capabilities and accuracies, as well as river and dam management, engineering and restoration.

Author : George Constantinescu
Publisher : CRC Press
Page : 2434 pages
File Size : 30,37 MB
Release : 2016-06-22
Category : Technology & Engineering
ISBN : 1315644479

GET BOOK

Understanding and being able to predict fluvial processes is one of the biggest challenges for hydraulics and environmental engineers, hydrologists and other scientists interested in preserving and restoring the diverse functions of rivers. The interactions among flow, turbulence, vegetation, macroinvertebrates and other organisms, as well as the transport and retention of particulate matter, have important consequences on the ecological health of rivers. Managing rivers in an ecologically friendly way is a major component of sustainable engineering design, maintenance and restoration of ecological habitats. To address these challenges, a major focus of River Flow 2016 was to highlight the latest advances in experimental, computational and theoretical approaches that can be used to deepen our understanding and capacity to predict flow and the associated fluid-driven ecological processes, anthropogenic influences, sediment transport and morphodynamic processes. River Flow 2016 was organized under the auspices of the Committee for Fluvial Hydraulics of the International Association for Hydro-Environment Engineering and Research (IAHR). Since its first edition in 2002, the River Flow conference series has become the main international event focusing on river hydrodynamics, sediment transport, river engineering and restoration. Some of the highlights of the 8th International Conference on Fluvial Hydraulics were to focus on inter-disciplinary research involving, among others, ecological and biological aspects relevant to river flows and processes and to emphasize broader themes dealing with river sustainability. River Flow 2016 (extended abstract book 854 pages + full paper CD-ROM 2436 pages) contains the contributions presented during the regular sessions covering the main conference themes and the special sessions focusing on specific hot topics of river flow research, and will be of interest to academics interested in hydraulics, hydrology and environmental engineering.

Author : Bruce L. Rhoads
Publisher : Cambridge University Press
Page : 544 pages
File Size : 23,10 MB
Release : 2020-04-29
Category : Science
ISBN : 1108173780

GET BOOK

Rivers are important agents of change that shape the Earth's surface and evolve through time in response to fluctuations in climate and other environmental conditions. They are fundamental in landscape development, and essential for water supply, irrigation, and transportation. This book provides a comprehensive overview of the geomorphological processes that shape rivers and that produce change in the form of rivers. It explores how the dynamics of rivers are being affected by anthropogenic change, including climate change, dam construction, and modification of rivers for flood control and land drainage. It discusses how concern about environmental degradation of rivers has led to the emergence of management strategies to restore and naturalize these systems, and how river management techniques work best when coordinated with the natural dynamics of rivers. This textbook provides an excellent resource for students, researchers, and professionals in fluvial geomorphology, hydrology, river science, and environmental policy.

Author : Daizo Tsutsumi
Publisher : John Wiley & Sons
Page : 850 pages
File Size : 16,44 MB
Release : 2017-07-05
Category : Science
ISBN : 111897140X

GET BOOK

With contributions from key researchers across the globe, and edited by internationally recognized leading academics, Gravel-bed Rivers: Processes and Disasters presents the definitive review of current knowledge of gravel-bed rivers. Continuing an established and successful series of scholarly reports, this book consists of the papers presented at the 8th International Gravel-bed Rivers Workshop. Focusing on all the recent progress that has been made in the field, subjects covered include flow, physical modeling, sediment transport theory, techniques and instrumentation, morphodynamics and ecological topics, with special attention given to aspects of disasters relevant to sediment supply and integrated river management. This up-to-date compendium is essential reading for geomorphologists, river engineers and ecologists, river managers, fluvial sedimentologists and advanced students in these fields.

Author : Jeffrey F. Mount
Publisher : Univ of California Press
Page : 378 pages
File Size : 10,99 MB
Release : 2023-09-01
Category : Nature
ISBN : 052091693X

GET BOOK

California Rivers and Streams provides a clear and informative overview of the physical and biological processes that shape California's rivers and watersheds. Jeffrey Mount introduces relevant basic principles of hydrology and geomorphology and applies them to an understanding of the differences in character of the state's many rivers. He then builds on this foundation by evaluating the impact on waterways of different land use practices—logging, mining, agriculture, flood control, urbanization, and water supply development. Water may be one of California's most valuable resources, but it is far from being one we control. In spite of channels, levees, lines and dams, the state's rivers still frequently flood, with devastating results. Almost all the rivers in California are dammed or diverted; with the booming population, there will be pressure for more intervention. Mount argues that Californians know little about how their rivers work and, more importantly, how and why land-use practices impact rivers. The forceful reconfiguration and redistribution of the rivers has already brought the state to a critical crossroads. California Rivers and Streams forces us to reevaluate our use of the state's rivers and offers a foundation for participating in the heated debates about their future.

Author : Michael Church
Publisher : John Wiley & Sons
Page : 605 pages
File Size : 25,42 MB
Release : 2012-01-30
Category : Nature
ISBN : 0470688904

GET BOOK

Gravel-Bed Rivers: Processes, Tools, Environments presents a definitive review of current knowledge of gravel-bed rivers, derived from the 7th International Gravel-bed Rivers Workshop, the 5-yearly meeting of the world’s leading authorities in the field. Each chapter in the book has been specifically commissioned to represent areas in which recent progress has been made in the field. The topics covered also represent a coherent progression through the principal areas of the subject (hydraulics; sediment transport; river morphology; tools and methods; applications of science). Definitive review of the current knowledge of gravel-bed rivers Coverage of both fundamental and applied topics Edited by leading academics with contributions from key researchers Thoroughly edited for quality and consistency to provide coherent and logical progression through the principal areas of the subject.

Author : Geoffrey E. Petts
Publisher : John Wiley & Sons
Page : 376 pages
File Size : 11,26 MB
Release : 1989
Category : History
ISBN :

GET BOOK

This volume contains a series of essays which detail the geographical changes and evolution of European rivers since the 18th century. The rivers examined include the Rhone, the Meuse, the Rhine, the Elbe, the Deuro, the Ebro, the Garonne, the Po and the Weser.

Author : Jiaxing Zhang
Publisher : CRC Press
Page : 2590 pages
File Size : 26,88 MB
Release : 2015-05-06
Category : Computers
ISBN : 1138026743

GET BOOK

This proceedings volume contains selected papers presented at the 2014 International Conference on Informatics, Networking and Intelligent Computing, held in Shenzhen, China. Contributions cover the latest developments and advances in the field of Informatics, Networking and Intelligent Computing.