Download or read book Turbulent Exchange of Fine Sediments in Tidal Flow written by Ronald van der Ham and published by . This book was released on 1999 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulent Exchange of Fine Sediments in Tidal Flow written by Raymond van der Ham and published by . This book was released on 1999 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fine Sediment Dynamics in the Marine Environment written by Johan C. Winterwerp and published by Elsevier. This book was released on 2002-06-05 with total page 731 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cohesive sediment, or mud, is encountered in most water bodies throughout the world. Often mud is a valuable resource, synonymous with fertile land, enriching the natural environment and used as an important building material. Yet mud also hinders navigation and consequently, dredging operations have been carried out since ancient times to safeguard navigation. Unfortunately, many mud deposits are now contaminated, endangering the eco-system and increasing the costs of dredging operations. The transport and fate of mud in the environment are still poorly understood and the need for basic research remains. This text contains the proceedings of the INTERCOH-2000 conference on progress in cohesive sediment research. It was the sixth in a series of conferences initially started by Professor Ashish Mehta in 1984 as a "Workshop on Cohesive Sediment Dynamics with Special Reference to the Processes in Estuaries". During these conferences the character of the first workshop has always been maintained, that is, small scale and dedicated to the physical and engineering aspects of cohesive sediments, without parallel sessions, but with ample time for discussions during and after the presentations, and followed by a book of proceedings containing thoroughly reviewed papers. INTERCOH-2000 was integrated with the final workshop of the COSINUS project. This project was carried out as a part of the European MAST-3 programme, and almost all European cohesive sediment workers were involved. INTERCOH-2000 focused on the behaviour and modelling of concentrated benthic suspensions, i.e. high-concentrated near-bed suspensions of cohesive sediment. Special attention was paid to: sediment - turbulence interaction; flocculation and settling velocity; high-concentrated mud suspensions; processes in the bed - consolidation; processes on the bed - erosion; field observations on mud dynamics; instrumentation; and numerical modelling.

Download or read book Introduction to the Physics of Cohesive Sediment Dynamics in the Marine Environment written by Johan C. Winterwerp and published by Elsevier. This book was released on 2004-08-20 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to the physical processes of cohesive sediment in the marine environment. It focuses on highly dynamic systems, such as estuaries and coastal seas. Processes on the continental shelf are also discussed and attention is given to the effects of chemistry, biology and gas.The process descriptions are based on hydrodynamic and soil mechanic principles, which integrate at the soil-water interface. This approach is substantiated through a classification scheme of sediment occurrences in which distinction is made between cohesive and granular material. Emphasis is also placed on the important interactions between turbulent flow and cohesive sediment suspensions, and on the impact of flow-induced forces on the stability of the seabed. An overview of literature on cohesive sediment dynamics is presented and a number of new developments are highlighted, in particular in relation to floc formation, settling and sedimentation, consolidation, bed failure and liquefaction and erosion of the bed. Moreover, it presents a summary on methods and techniques to measure the various sediment properties necessary to quantify the various parameters in the physical-mathematical model descriptions. A number of examples and case studies have been included.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 2000 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fine Sediment In Open Water From Fundamentals To Modeling written by Johan C Winterwerp and published by World Scientific. This book was released on 2021-11-08 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fine Sediment in Open Water is mainly written for professional engineers working in estuaries and coastal systems. It provides the basis for a fundamental understanding of the physical, biological and chemical processes governing the transport and fate of fine sediment in open water and explains how this understanding can steer engineering studies with numerical models. This is a unique treatment of processes at a variety of spatial and temporal scales, from the micro-scale (colloid scale) to system-wide scales, and from intra-tidal time periods to decades.Beginning with the processes governing the transport and fate of fine sediment in shallow open water, the first eight chapters are dedicated to the hydrodynamic, soil mechanics and biological processes which determine fine sediment concentrations in the water column, in/on the bed and the exchange of sediment between bed and water column. The next two chapters treat the net fluxes of fine sediment as a function of asymmetries in forcing and sediment properties. These fundamental processes form the basis for the subsequent chapters on modeling in which the governing equations are presented, and tools are provided to aggregate and parameterize the various processes elaborated in the first eight chapters. Further, any numerical model study should be based on a conceptual model, as illustrated in the final five chapters, which provide examples of numerical modeling studies on the transport and fate of fine sediment in a coastal sea, an estuary, a tidal river, a lake, and around and within a harbor basin.Related Link(s)

Download or read book Flocculation of Fine Sediment in Turbulent Flows written by Iain Thomas MacDonald and published by . This book was released on 2009 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Dynamics of Cross shore Sediment Transport in the Rhine Region of Freshwater Influence written by Raul Flores Audibert and published by . This book was released on 2018 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: River plumes are critical to the exchange of suspended particulate matter (SPM) between nearshore regions and shelf seas. These exchanges contribute fundamentally to the health and function of the coastal ecosystem, and have important implications for the overall sediment and biomass budgets. The physical processes that determine these exchanges depend on the dynamical characteristics of the river plume, which are largely affected by the freshwater input, water depth and the tidal flow, among many other factors. Here, we present field measurements and numerical modeling of hydrodynamics and sediment transport in order to investigate the dynamics of cross-shore exchange processes along a shallow river plume system. Measurements from moorings and bottom frames along the Rhine region of freshwater influence (ROFI) are used to evaluate the importance of baroclinic (stratified) and barotropic (unstratified) dynamics on the cross-shore transport of fine sediments, in a site located 10 km north of the river mouth. These measurements allowed for the evaluation of sediment transport dynamics over a wide range of stratification, wind, wave and tidal conditions. Both barotropic and baroclinic processes are found to be relevant for the cross-shore transport of fines at depth. The observations suggest that wind and wave-driven transport during storms tends to move fine sediment offshore, while calmer, more stratified conditions move it back onshore. Data collected during an intense 2-day storm are used to document the occurrence of a wave-supported gravity flow (WSGF) in a shallow inner shelf site along the Rhine ROFI. These observations are the first to document a WSGF on a predominantly sandy environment; previous observations had been restricted to muddy shelf deposits with very fine particle size distributions. The observed WSGF dynamics support previous studies regarding the use of a friction-buoyancy balance, and suggest that the same balance can be used on sandy seabeds. The offshore transport associated with the WSGF was much higher than other modes of transport, such as the suspended transport in the upper water column or the bedload, highlighting the importance of these events to cross-shelf transport and morphological evolution on inner-shelf regions. The occurrence of a WSGF under conditions unique from previous observations suggest that WSGF may occur in a much wider range of shelf locations than previously thought. In the Rhine, the tidal flow interacts with the cross-shore density gradients to generate tidal straining. The influence of tidal straining in the generation of a turbidity maximum zone (TMZ) along the Rhine ROFI is investigated using idealized numerical simulations. Tidal straining leads to cross-shore sediment convergence and the formation of a nearshore TMZ, that is detached from the coastline and confined to the near-bed region. Subtidal landward sediment fluxes are created by asymmetries in vertical mixing between the stratifying and de-stratifying phases of the tidal cycle. Model simulations show the development of a coastal TMZ for a wide range of horizontal density gradients, latitudes and settling velocity of bed sediments, suggesting that these phenomena are not limited to the Rhine ROFI. A parameter space for the occurrence of tidal straining and a coastal turbidity maximum is proposed in terms of a horizontal Richardson number and a Stokes number. Lastly, near-bed turbulence and bedform measurements are used to investigate the influence of bed roughness in the estimation of bed shear stress under the influence of large waves and currents. Direct measurements of the near-bed Reynolds stresses are compared to bed stress estimates obtained from a 1D bottom boundary layer model that accounts for wave-current interaction. Model-derived bed stresses compare well with measurements when field measurements of bedform dimensions are incorporated into the model calculations. The use of standard bedform predictors based on bulk wave properties results in a severe overestimation of the bed stresses at this particular site. We find that the combination of a time-dependent bedform evolution model and a 1D wave-current boundary layer model provides a simple approach that allows improved bed stress estimates in cases where bedform data is not available. Estimates of bed stresses and measured vertical turbulent sediment fluxes are then incorporated into a linear erosion formulation to obtain field-based estimates of the critical stress for erosion and resuspension constant.

Download or read book Deposition of Fine Sediments in Turbulent Flows written by United States Environmental Protection Agency (EPA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deposition of Fine Sediments in Turbulent Flows

Download or read book Effects of Turbulence on Suspended Sediment Concentrations in a Tidal Flow written by Andrew Robert Campbell and published by . This book was released on 1996 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Entrainment of Fine Sediments by Turbulent Flows written by Alexander James Sutherland and published by . This book was released on 1966 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book DEPOSITION OF FINE SEDIMENTS IN TURBULENT FLOWS written by United States. Environmental Protection Agency. Office of Research and Monitoring and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vertical Turbulence Exchange in Tidal Flows written by Koji Shiono and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deposition of Fine Sediments in Turbulent Flows written by Emmanuel Partheniades and published by . This book was released on 1972 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biogeochemical Dynamics at Major River Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tidal Hydraulic Engineering written by S.N. Ghosh and published by Routledge. This book was released on 2017-10-06 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The text on tidal hydraulic engineering includes discussion of: basic characterstics of tides and tidal propagation; hydrographic surveys in tidal rivers; and design considerations for tidal sluice gates for drainage and fish farms in aquaculture.