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Sediment Transport And Channel Adjustments Associated With Dam Removal
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Book Synopsis Sediment Transport and Channel Adjustments Associated with Dam Removal by : Fang Cheng
Download or read book Sediment Transport and Channel Adjustments Associated with Dam Removal written by Fang Cheng and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Dam removal has recently become one of the most controversial issues among the environmental society community in the United States. Release of reservoir sediment is the main uncertainty associated with this issue. This study has extensively documented the short-term changes in channel geometry, bed level profile, size distribution of substrates, and their relations with the sediment transport at the reach scale after a low-head dam removal. Before the complete removal, the structure was breached to de-water the reservoir. The suspended sediment concentration (SSC) and discharge downstream of the dam showed nearly no change during the breach. In contrast, the complete removal of the structure produced a sudden increase in downstream discharge and SSC. However, the amount of increase was insignificant compared to the annual rainfall event. The SSC within 10 months after the removal showed no significant difference with that of SSC before the removal. No bank erosion was evident at both upstream and downstream of the dam; while net deposition occurred downstream and net erosion occurred in the reservoir. Deposition and scouring were evident in the reservoir with overall decrease by 30% in bed slope. Deposition measurements showed up to a 20 cm increase in bed level downstream of the dam. Downstream bed materials size became at least 40% finer for post-removal conditions than for pre-removal conditions as a result of deposition of finer materials. High resolution Digital Elevation Models (DEMs) of the river bathymetry were generated from differential GPS surveys. The volume of deposition and erosion was computed from differencing the DEM for post-removal from the DEM for pre-removal. Compared with the observations, the transport rate estimated from the DEMs overestimated the transport rate within an order of magnitude. A 1-D hydrodynamic model, calibrated with the observations showed promising simulation results on the dynamics of dam removal and sediment transport. The major features described by the model were: 1) the magnitude and timing of the flood wave during the dam removal; and 2) the bed level adjustments after dam removal. Sensitivity analysis showed that the model was strongly dependent on the size distribution of the reservoir substrates.
Book Synopsis A Pre-dam-removal Assessment of Sediment Transport for Four Dams on the Kalamazoo River Between Plainwell and Allegan, Michigan by : Atiq U. Syed
Download or read book A Pre-dam-removal Assessment of Sediment Transport for Four Dams on the Kalamazoo River Between Plainwell and Allegan, Michigan written by Atiq U. Syed and published by . This book was released on 2005 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geomorphic Responses Following Dam Removal by : John Kelly Wooster
Download or read book Geomorphic Responses Following Dam Removal written by John Kelly Wooster and published by . This book was released on 2003 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Patterns and Processes of Sediment Transport Following Sediment-filled Dam Removal in Gravel Bed Rivers by : Gregory B. Stewart
Download or read book Patterns and Processes of Sediment Transport Following Sediment-filled Dam Removal in Gravel Bed Rivers written by Gregory B. Stewart and published by . This book was released on 2006 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dam removal is increasingly viewed as a river restoration tool because dams affect so many aspects of river hydrology, geomorphology, and ecology; but removal also has impacts. When a dam is removed, sediment accumulated over a dam?s lifetime may be transported downstream; and the timing, fate and consequences of this sediment remain some of the greatest unknowns associated with dam removal. In this thesis, I develop a conceptual model for erosion and deposition following removal of sediment-filled dams in mountain streams, and use field studies to document actual change. The data show that reservoir erosion in mountain rivers is likely to occur by knickpoint migration, with 85% of stored sediment being released during a single storm event in two field studies, at shear stresses less than that required for mobilization of the median surface particle size. Coarse sediment is predicted to deposit close to the dam with channel aggradation decreasing exponentially with increasing distance downstream, although some channel features are shown to have a greater propensity for aggradation than others. Field studies show that turbidity associated with dam removal and reservoir erosion may decrease hyporheic exchange, but gravel deposition (e.g., 470 m3 of gravel from Dinner Creek Dam) has the potential to more than offset that decrease, and increased hyporheic exchange is shown to reduce diurnal temperature change. Macroinvertebrate density and taxa richness did not respond to dam removal itself, but rather with time-lagged reservoir erosion. Following reservoir erosion, macroinvertebrate density recovered quickly, although longterm taxa community composition appears to be altered. On the Sandy River, field measurements of shear stress and patterns of sediment deposition following cold lahars were used as an analog to predict the fate of fine sediment, which is likely to deposit far from the dam. Results show that the Sandy River has little capacity for fine sediment storage in pools above RK 6.4 (~ 42 kilometers below Marmot Dam) at discharges associated with reservoir sediment releases. Taken as a whole, this paper illustrates a complex suite of process that may accompany removal of sediment-filled dams in mountain rivers.
Book Synopsis Gravel-Bed Rivers by : Daizo Tsutsumi
Download or read book Gravel-Bed Rivers written by Daizo Tsutsumi and published by John Wiley & Sons. This book was released on 2017-07-05 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis U.S. Geological Survey Professional Paper by :
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book River Dynamics written by Bruce L. Rhoads and published by Cambridge University Press. This book was released on 2020-04-29 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Challenges of Dam Removal and River Restoration by : Jerome V. DeGraff
Download or read book The Challenges of Dam Removal and River Restoration written by Jerome V. DeGraff and published by Geological Society of America. This book was released on 2013-02-01 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "River restoration is a societal goal in the United States. This collection of research articles focuses on our current understanding of the impacts of removing dams and the role of dam removal in the larger context of river restoration. The papers are grouped by topic: (1) assessment of existing dams, strategies to determine impounded legacy sediments, and evaluating whether or not to remove the dam; (2) case studies of the hydrologic, sediment, and ecosystem impacts of recent dam removals; (3) assessment of river restoration by modifying flows or removing dams; and (4) the concept of river restoration in the context of historical changes in river systems"--Provided by publisher.
Book Synopsis Erosion and Sedimentation Manual by :
Download or read book Erosion and Sedimentation Manual written by and published by Government Printing Office. This book was released on 2006 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOTE: NO FURTHER DISCOUNT FOR THIS PRINT PRODUCT--OVERSTOCK SALE --Significantly reduced list price while supplies last The Erosion and Sedimentation Manual provides a comprehensive coverage of subjects in nine chapters (i.e., introduction, erosion and reservoir sedimentation, noncohesive sediment transport, cohesive sediment transport, sediment modeling for rivers and reservoirs, sustainable development and use of reservoirs, river process and restoration, dam decommissioning and sediment management, and reservoir surveys and data analysis). Each chapter is self-contained, with cross references of subjects that are discussed in different chapters of this manual. The manual also includes a list of commonly used notations used in the erosion and sedimentation literature, conversion factors between the Imperial and metric units, physical properties of water, and author and subject indexes for easy reference. Each chapter has a list of reference for readers who would like to seek out more detailed information on specific subjects. Audience The manual would be useful for researchers, university professors, graduate students, geologists, hydrographic survey analysts, municipal and state water research specialists, and engineers in solving erosion and sedimentation problems. Related products: Earth Science resources collection can be found here: https: //bookstore.gpo.gov/catalog/science-technology/earth-science
Book Synopsis Sampling and Modeling of Sediment Transport and Reservoir Erosion Following Dam Removal by : James Walden Johnsen
Download or read book Sampling and Modeling of Sediment Transport and Reservoir Erosion Following Dam Removal written by James Walden Johnsen and published by . This book was released on 2011 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of bedload transport in combination with suspended sediment and discharge data collected by the USGS illustrate the rates, magnitudes and processes by which reservoir sediment evacuated the Milltown Reservoir after the 2008 removal of Milltown Dam from just downstream of the confluence of the Blackfoot and Clark Fork Rivers, Montana. Mobilized sediments transported as a series of distinct waves and the speed at which the waves moved downstream was dependent upon the grain size of the sediment. Sand and smaller sized particles were transported out of the reservoir rapidly both as bedload and in suspension with different thresholds for incipient motion between the confined Blackfoot and unconfined alluvial Clark Fork Arms of the reservoir. Bedload sediments, gravel and larger sized, transported downstream as a dispersing and translating wave. Sediment budget calculations, both volumetric and transport derived, illustrate the one-dimensional HEC-6 and DREAM-1 model's inaccuracy in predicting sediment transport in unconfined alluvial deposits while both models predicted accurately confined channel geometry transport settings. Results from sampling and modeling demonstrate that the most important factors in reservoir sediment transport are the channel geometry, hydrology, and grain size and location of the reservoir sediment; which in turn determine distance, processes and timing of transport.
Book Synopsis Reservoir Sedimentation by : G.W. Annandale
Download or read book Reservoir Sedimentation written by G.W. Annandale and published by Elsevier. This book was released on 1987-01-01 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on reservoir sedimentation in recent years has been aimed mainly at water resources projects in developing countries. These countries, especially in Africa, often have to cope with long droughts, flash floods and severe erosion problems. Large reservoir capacities are required to capture water provided by flash floods so as to ensure the supply of water in periods of drought. The problem arising however is that these floods, due to their tremendous stream power, carry enormous volumes of sediment which, due to the size of reservoirs, are virtually deposited in toto in the reservoir basin, leading to fast deterioration of a costly investment. Accurate forecasting of reservoir behaviour is therefore of the utmost importance.This book fills a gap in current literature by providing in one volume comprehensive coverage of techniques required to practically investigate the effects sediment deposition in reservoirs has on the viability of water resources projects. Current techniques for practically estimating sediment yield from catchments, estimating the volume of sediment expected to deposit in reservoirs, predicting sediment distribution and calculating scour downstream of reservoirs are evaluated and presented. The liberal use of diagrams and graphs to explain the various techniques enhances understanding and makes practical application simple. A major feature of the book is the application of stream power theory to explain the process of reservoir sedimentation and to develop four new methods for predicting sediment distribution in reservoirs.The book is primarily directed at practising engineers involved in the planning and design of water resources projects and at post-graduate students interested in this field of study.
Book Synopsis Economic Valuation of River Systems by : Fredrick J. Hitzhusen
Download or read book Economic Valuation of River Systems written by Fredrick J. Hitzhusen and published by Edward Elgar Publishing. This book was released on 2007 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: . . . the book provides a wide variety of practical examples of economic assessments of river management projects. . . the book offers policy-makers a nice range of valuation case studies and practical and illustrative guidance on the use of economic valuation results in cost benefit analysis of river management. Marije Schaafsma, Environmental and Resource Economics It is rare to find a book that attempts to integrate physical, biological and social sciences (economics) to address environmental problems, but this book does a great job of it. It is also rare to find a book that addresses both the benefits and the costs of river restoration, and again this book delivers. This collection of case studies provides an informative and practical guide to conducting economic analyses of many different types of river restoration. Scientists interested in quantifying the benefits and costs of river restoration will gain a very quick and thorough education from the case studies presented in this book. John Loomis, Colorado State University, US The book applies benefit cost analysis and a wide array of non-market and distribution economic valuation methods in ecologic context to determine the pay-off and distribution impacts of various infrastructure and water quality improvements to eight river systems in the Great Lakes region of the US. The generally positive results have important implications for public policy and future research. Prime readership is the wide range of academics, NGO and government agency staff and citizen action groups concerned with the management and protection of rivers and other natural resource systems.
Book Synopsis Dams and Geomorphology by : P.J. Beyer
Download or read book Dams and Geomorphology written by P.J. Beyer and published by Elsevier. This book was released on 2005-12-19 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dams profoundly impact the geomorphology of rivers by altering the natural patterns of water, sediment and energy flow in rivers. These changes have a largely negative impact on aquatic and riparian ecosystems upstream and downstream of the dam. Natural dams also impact river geomorphology, although with positive and negative repercussions for aquatic and riparian organisms. In 2002, the 33rd Binghamton Geomorphology Symposium convened under the theme "Dams and Morphology," and featured invited papers and contributed posters on topics of natural dams, artificial dams, and dam removal. Fourteen of these papers have been included in this volume.
Book Synopsis Savage Rapids Dam Sediment Evaluation Study by :
Download or read book Savage Rapids Dam Sediment Evaluation Study written by and published by . This book was released on 2001 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Pre-dam-removal Assessment of Sediment Transport for Four Dams on the Kalamazoo River Between Plainwell and Allegan, Michigan by : Atiq U. Syed
Download or read book A Pre-dam-removal Assessment of Sediment Transport for Four Dams on the Kalamazoo River Between Plainwell and Allegan, Michigan written by Atiq U. Syed and published by . This book was released on 2005 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecosystems in a Human-Modified Landscape by : Guy Woodward
Download or read book Ecosystems in a Human-Modified Landscape written by Guy Woodward and published by Academic Press. This book was released on 2011-08-12 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thematic volume represents an important and exciting benchmark in the study of integrative ecology, synthesizing and showcasing current research and highlighting future directions for the development of the field.
Book Synopsis Engineering Geology for Society and Territory - Volume 3 by : Giorgio Lollino
Download or read book Engineering Geology for Society and Territory - Volume 3 written by Giorgio Lollino and published by Springer. This book was released on 2014-08-21 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is one out of 8 IAEG XII Congress volumes and deals with river basins, which are the focus of many hydraulic engineering and hydrogeological studies worldwide. Such studies examine river systems as both a resource of the fluvial environment, and also explore river-related hazards and risks. The contributions of researchers from different disciplines focus on: surface-groundwater exchanges, stream flow, stream erosion, river morphology and management, sediment transport regimes, debris flows, evaluation of water resources, dam operation and hydropower generation, flood risks and flood control, stream pollution and water quality management. The contributions include case studies for advancing field monitoring techniques, improving modeling and assessment of rivers and studies contributing to better management plans and policies for the river environment and water resources. The Engineering Geology for Society and Territory volumes of the IAEG XII Congress held in Torino from September 15-19, 2014, analyze the dynamic role of engineering geology in our changing world and build on the four main themes of the congress: environment, processes, issues and approaches. The congress topics and subject areas of the 8 IAEG XII Congress volumes are: Climate Change and Engineering Geology. Landslide Processes. River Basins, Reservoir Sedimentation and Water Resources. Marine and Coastal Processes. Urban Geology, Sustainable Planning and Landscape Exploitation. Applied Geology for Major Engineering Projects. Education, Professional Ethics and Public Recognition of Engineering Geology. Preservation of Cultural Heritage.
