Sediment Transport And Channel Morphology Dynamics Of Highly Regulated Alluvial Rivers A Case Study Of The Lowermost Mississippi River
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Sediment Transport And Channel Morphology Dynamics Of Highly Regulated Alluvial Rivers A Case Study Of The Lowermost Mississippi River
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Author : Sanjeev Joshi
language : en
Publisher:
Release Date : 2017
Sediment Transport And Channel Morphology Dynamics Of Highly Regulated Alluvial Rivers A Case Study Of The Lowermost Mississippi River written by Sanjeev Joshi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Sediment Transport Dynamics In The Lower Mississippi River
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Author : Jeffrey Albert Nittrouer
language : en
Publisher:
Release Date : 2010
Sediment Transport Dynamics In The Lower Mississippi River written by Jeffrey Albert Nittrouer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This dissertation examines the dynamics of sediment transport and channel morphology in the lower Mississippi River. The area of research includes the portion of the river where reach-averaged downstream flow velocity responds to the boundary condition imposed by the relatively uniform water-surface elevation of the receiving basin. Observational studies provided data that are used to identify channel-bed sediment composition, and measure bed-material sediment flux and the properties of the fluid-flow field over a variety of water-discharge conditions. The analyses demonstrate that a significant portion of the channel bed of the final 165 kilometers of the Mississippi River consists of exposed and eroding underlying relict sedimentary strata that qualify as surrogate bedrock. The exposed bedrock is confined to the channel thalweg, particularly in river-bend segments, and actively mobile bed-material sediments are positioned on subaqueous bars fixed by river planform. The analyses for sediment flux provides insight to the nature of sediment transport: during low- and moderate-water discharge, bed-material movement occurs primarily as minimal bedform flux, and so bed materials are not transferred between alluvial bars. During high-water discharge, bed-material transport increases one-hundred fold, and sands move as a part of both suspended and bedform transport. Physical models are used to show that skin-friction shear stress increases by a factor of ten for the measured water-discharge range. This change is not possible given conditions of uniform water flow, and therefore non-uniform flow in response to the Mississippi River approaching its outlet has a significant impact on the timing and magnitude of sediment flux through the lower river. In order to estimate the dynamics of bed material movement from the uniform to non-uniform segment of the river (lower 800 km), data for channel morphology are used to construct a model that predicts spatial changes in water-flow velocity and bed-material flux over a range of water-discharge conditions. The model demonstrates that non-uniform flow tends to produce a region of net channel-bed aggradation between 200-700 kilometers above the outlet, and a region of channel-bed degradation for the final 200. The implication for these results for the spatial variability of channel morphology and kinematics is explored.
Incised River Channels
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Author : Stephen Darby
language : en
Publisher: John Wiley & Sons
Release Date : 1999-05-04
Incised River Channels written by Stephen Darby and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-05-04 with Nature categories.
Incised river channels are ubiquitous features of landscapes disturbed by environmental change. Problems associated with channel incision include undermining of structures, downstream sedimentation, severe bank erosion and widening, and degradation of aquatic and riparian habitats. In Incised River Channels, research from the disciplines of geomorphology, hydraulics, sediment transport, ecology, environmental management and river engineering is brought together to develop a detailed, integrated treatment, over a range of spatial and temporal scales, of the dynamic behaviour of unstable incised rivers. The book emphasizes the need for improved understanding of the processes and mechanisms of channel adjustment and evolution to underpin sustainable river management and engineering. It contains important original contributions from an international authorship. Contributors include university and government scientists and researchers, as well as practitioners from regulatory and consultancy organizations. Divided into three thematic sections, Incised River Channels covers the nature and significance of incised channels, processes, and mitigation and management. Fundamental principles are illustrated using case studies from a wide range of physiographic environments, providing a wide geographical coverage. This volume will be of interest to academics and advanced level students who are studying fluvial geomorphology and/or river engineering. It will also be of appeal to all those interested in river adjustment and management.
Incised Channels
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Author : Stanley Alfred Schumm
language : en
Publisher:
Release Date : 1984
Incised Channels written by Stanley Alfred Schumm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Technology & Engineering categories.
Channel Conveyance Capacity Channel Change And Sediment Transport In The Lower Puyallup White And Carbon Rivers Western Washington
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Author : Jonathan A. Czuba
language : en
Publisher: U.S. Department of the Interior, U.S. Geological Survey
Release Date : 2010-12-01
Channel Conveyance Capacity Channel Change And Sediment Transport In The Lower Puyallup White And Carbon Rivers Western Washington written by Jonathan A. Czuba and has been published by U.S. Department of the Interior, U.S. Geological Survey this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-12-01 with categories.
Draining the volcanic, glaciated terrain of Mount Rainier, Washington, the Puyallup, White, and Carbon Rivers convey copious volumes of water and sediment down to Commencement Bay in Puget Sound. Recent flooding in the lowland river system has renewed interest in understanding sediment transport and its effects on flow conveyance throughout the lower drainage basin. Bathymetric and topographic data for 156 cross sections were surveyed in the lower Puyallup River system by the U.S. Geological Survey (USGS) and were compared with similar datasets collected in 1984. Regions of significant aggradation were measured along the Puyallup and White Rivers. Between 1984 and 2009, aggradation totals as measured by changes in average channel elevation were as much as 7.5, 6.5, and 2 feet on the Puyallup, White, and Carbon Rivers, respectively. These aggrading river sections correlated with decreasing slopes in riverbeds where the rivers exit relatively confined sections in the upper drainage and enter the relatively unconstricted valleys of the low-gradient Puget Lowland. Measured grain-size distributions from each riverbed showed a progressive fining downstream. Analysis of stage-discharge relations at streamflow-gaging stations along rivers draining Mount Rainier demonstrated the dynamic nature of channel morphology on river courses influenced by glaciated, volcanic terrain. The greatest rates of aggradation since the 1980s were in the Nisqually River near National (5.0 inches per year) and the White River near Auburn (1.8 inches per year). Less pronounced aggradation was measured on the Puyallup River and the White River just downstream of Mud Mountain Dam. The largest measured rate of incision was measured in the Cowlitz River at Packwood (5.0 inches per year). Channel-conveyance capacity estimated using a one-dimensional hydraulic model decreased in some river reaches since 1984. The reach exhibiting the largest decrease (about 20–50 percent) in channel-conveyance capacity was the White River between R Street Bridge and the Lake Tapps return, a reach affected by recent flooding. Conveyance capacity also decreased in sections of the Puyallup River. Conveyance capacity was mostly unchanged along other study reaches. Bedload transport was simulated throughout the entire river network and consistent with other observations and analyses, the hydraulic model showed that the upper Puyallup and White Rivers tended to accumulate sediment. Accuracy of the bedload-transport modeling, however, was limited due to a scarcity of sediment-transport data sets from the Puyallup system, mantling of sand over cobbles in the lower Puyallup and White Rivers, and overall uncertainty in modeling sediment transport in gravel-bedded rivers. Consequently, the output results from the model were treated as more qualitative in value, useful in comparing geomorphic trends within different river reaches, but not accurate in producing precise predictions of mass of sediment moved or deposited. The hydraulic model and the bedload-transport component were useful for analyzing proposed river-management options, if surveyed cross sections adequately represented the river-management site and proposed management options. The hydraulic model showed that setback levees would provide greater flood protection than gravel-bar scalping after the initial project construction and for some time thereafter, although the model was not accurate enough to quantify the length of time of the flood protection. The greatest hydraulic benefit from setback levees would be a substantial increase in the effective channel-conveyance area. By widening the distance between levees, the new floodplain would accommodate larger increases in discharge with relatively small incremental increases in stage. Model simulation results indicate that the hydraulic benefit from a setback levee also would be long-lived and would effectively compensate for increased deposition within the setback reach from increased channel-conveyance capacity. In contrast, the benefit from gravel-bar scalping would be limited by the volume of material that could be removed and the underlying hydraulics in the river section that would be mostly unaffected by scalping. Finally, the study formulated an explanation of the flooding that affected Pacific, Washington, in January 2009. Reduction in channel-conveyance capacity of about 25 percent at the White River near Auburn streamflow-gaging station between November 2008 and January 2009 was caused by rapid accumulation of coarse-grained sediment just downstream of the gage, continuing an ongoing trend of aggradation that has been documented repeatedly.
Sediment Response To Large Scale Environmental Change
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Author : Richard P. R. Pannell
language : en
Publisher:
Release Date : 1999
Sediment Response To Large Scale Environmental Change written by Richard P. R. Pannell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Knowledge about sediment yields is important in developing management strategies for fluvial systems. The effect of sediment must be considered in the design of river structures and in determining water quality for biotic systems. Changes in sediment transport regimes are difficult to understand or predict due to the complexity of factors that influence sediment flux in fluvial systems. Relationships about sediment source, sinks and transport have long been studied and many of these relationships have been quantitatively and qualitatively defined. However, due to the scarcity of long-term sediment records it is often difficult to test these relationships. This study examines one of these long-term suspended sediment records for the Mississippi River at East Dubuque, Illinois from 1943 to 1996. Daily suspended sediment concentrations from the United States Army Corps of Engineers station at East Dubuque were analyzed for the spring and summer months (March - August). Sediment concentrations were analyzed in terms of average concentration during different hydrologic events at the large basin scale. These events included the spring snowmelt runoff (low and high magnitude) and different intensity storm runoff (low, moderate and high). Additionally, peak sediment concentrations during storm runoff were also analyzed. The general trend for all of these analyses suggests a significant decrease in sediment concentrations from the 1940s to the 1990s. The strongest trends are found in high magnitude snowmelt runoff and in high and moderate magnitude storm runoff. Peak concentrations in storm runoff have decreased from about 1000 ppm in the l940s to about 200 ppm in the 1990s. Average concentrations have likewise decreased from about 200 ppm in the 1940s to 100 ppm in the 1990s. Changes in land management practices are identified as being the primary environmental factor influencing sediment concentrations.
Regional Sediment Analysis Of Mississippi River Sediment Transport And Hydrographic Survey Data
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Author :
language : en
Publisher:
Release Date : 2002
Regional Sediment Analysis Of Mississippi River Sediment Transport And Hydrographic Survey Data written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
The cumulative impacts of human occupation and development of watersheds, combined with engineering works on river channels have significantly disrupted the dynamic equilibrium of many stream systems and ecosystems. Sediments generated through channel instability are carried downstream to cause sedimentation problems in flood control channels, destroy wetlands and lakes, adversely impact fish and wildlife habitats, degrade water quality, adversely impact infrastructure. In extreme cases, sedimentation itself may initiate further accelerated stream instabilities. The Corps of Engineers attempt to design channel systems on a regional basis, particularly with respect to sediment management. Progress is hampered because there is little published guidance for accomplishing effective regional sediment management and a shortage of reliable and comprehensive data sets with which to investigate and understand sediment dynamics at the regional scale. Compilation of historical and contemporary data on sediment transport rates, sediment load and bed material particles sizes, channel morphology and engineering interventions along the Lower Mississippi River provides a data set of unparalleled value in Regional Sediment Analysis. In this report, the potential of the data to support regional analysis of sediment transfer, morphological response and the identification of causal links between engineering and sediment problems at a variety of scales is examined.
Erosion And Sediment Transport Monitoring Programmes In River Basins
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Author : Jim Bogen
language : en
Publisher:
Release Date : 1992
Erosion And Sediment Transport Monitoring Programmes In River Basins written by Jim Bogen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Erosion categories.
Development of measurement techniques; Suspended load and bed load transport in mountain streams determined by different methods; Bed sediment characterization in river engineering problems; Direct measurement of in-channel abrasion processes; Measuring changes in micro and macro roughness on mobile gravel beds; Using COSSY (CObble Satellite SYstem) for measuring the effects of lift and drag forces; The impact of particle size controls on stream turbidity measurements: some implications for suspended sediment yield estimation; Application of sandwave measurements in calculating bel load discharge; Turbidimeter measurementsin a tropical river, Costa Rica; Recording bedload discharge in a semiarid channel, Nahal Yatir, Israel; Determining event bedload volumes for evaluation of potential degradation sites due to gravel extraction, N.S.W., Australia Jonathan; River bank erosion events on the Upper Severn detected by the photoelectronic erosion pin (PEEP) system; A study of field methods for measuring sediment discharge; Quantification of soil detachment by raindrop impact: performance of classical formulae of kinetic energy in Mediterranean storms; Tracing the source of recent sediment using environmental magnetism and radionuclidesin the karst of the Jenolan Caves, Australia; A new acoustic sensor for sediment dishcarge measurement; The use Of caesium-137 measurements in soil erosion surveys; Use of radiometric fingerprints to derive information on suspended sediment sources; Separate in-situ entrapment of sand and silt in river systems; Measuring techniques of bed load in de Yangtze River; Sampling strategies; Monitoring grain size of suspended sediments in rivers; Reliability and representativeness of a suspended sediment concentration monitoring programme for a remote alpine proglacial river; Monitoring sediment load from erosion events; The use of automatically collected point samples to estimate suspended sediment and associated trace element concentrations for determining annual mass transport; Calculating the suspended sediment load of the Dez River; Towards the design of a strategy for sampling suspended sediments in small headwater catchments; Temporal variability of suspended sediment flux from a subarctic glacial river, southern Iceland; Stream suspended sediment transport monitoring - why, how and what is being measured? Critical reflections on long term sediment monitoring programmes demonstrated on the Australian Danube; A sampling strategy for an investigation on particle associated contaminants; Monitoring of suspended sediment concentration in discharge from regulated lakes in glacial deposits; Some sampling considerations in the design of effective strategies for monitoring sediment-associated transport; A comparison of methods used to measure suspended sediment in Canada's federal monitoring programs; Monitoring networks and programmes; Erosion and sediment transport in South America: monitoring programmes and strategies; River morphology, sediments and fish habitats; Environmental studies in Western Europe using overbank sediment; Problems of monitoring erosion and sediment yields in southern Africa; Network evaluation and planning: Canada's sediment monitoring program; Planning sediment monitoring programs using a watershed model; Refining a tributary monitoring program for the Great Lakes basin; River reach characterization: a survey strategy for river regime and environmental Monitoring and analysis; The design and operation of sediment transport measurement programmes in river basins: the Chinese experience; Environmental quality: changing times for sediment programs; A sediment monitoring program for North America; The Vigil Network - long-term monitoring to assess landscape changes; Multipurpose studies of erosion and sedimentation in the Upper Ob basin; The Swedish network of sediment transport; Case studies; Sediment delivery in large prairie river basins, western Canada; Hydrological and sediment dynamics network design in a Mediterranean mountainous area subject to gylly erosion; Assessment of catchment erosion in the southern Pennines, United Kingdom, using reservoir sedimentation monitoring; Spatial and temporal variations in erosion and sediment yield; Assessment of the impact of farmland erosion on sediment quality: the Saskatchewan river basin, western Canada; Suspended sediment dynamics of a riverine lake of the St. Lawrence River, Canada; A programme of monitoring sediment transport in north central Luzon, the Philippines; Channel erosion and erosion monitoring along the Rhine River; Monitoring radionuclide and suspended-sediment transport in the Little Colorado River basin, Arizona and New Mexico, USA; Erosion and sediment transport in Papua New Guinea. Network design and monitoring. Case study: Ok Tedi Coppermine; The new sediment yield map for southern Africa.
River Dynamics
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Author : Bruce L. Rhoads
language : en
Publisher: Cambridge University Press
Release Date : 2020-04-29
River Dynamics written by Bruce L. Rhoads and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-29 with Science categories.
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.
River Sedimentation
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Author : Silke Wieprecht
language : en
Publisher: CRC Press
Release Date : 2016-11-30
River Sedimentation written by Silke Wieprecht and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-30 with Science categories.
Sediment dynamics in fluvial systems is of great ecological, economic and human-health-related significance worldwide. Appropriate management strategies are therefore needed to limit maintenance costs as well as minimize potential hazards to the aquatic and adjacent environments. Human intervention, ranging from nutrient/pollutant release to physical modifications, has a large impact on sediment quantity and quality and thus on river morphology as well as on ecological functioning. Truly understanding sediment dynamics requires as a consequence a multidisciplinary approach.River Sedimentation contains the peer-reviewed scientific contributions presented at the 13th International Symposium on River Sedimentation (ISRS 2016, Stuttgart, Germany, 19-22 September 2016), and includes recent accomplishments in theoretical developments, numerical modelling, experimental laboratory work, field investigations and monitoring as well as management methodologies.