The Dynamics Of Cross Shore Sediment Transport In The Rhine Region Of Freshwater Influence PDF Download
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Author | : Raul Flores Audibert |
Publisher | : |
Total Pages | : 166 |
Release | : 2018 |
Genre | : |
ISBN | : |
Download The Dynamics of Cross-shore Sediment Transport in the Rhine Region of Freshwater Influence Book in PDF, ePub and Kindle
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.
Author | : Sylvain Ouillon |
Publisher | : MDPI |
Total Pages | : 284 |
Release | : 2019-04-11 |
Genre | : Science |
ISBN | : 3038978442 |
Download Sediment Transport in Coastal Waters Book in PDF, ePub and Kindle
The interface of 440,000 km long coastline in the world is subject to global change, with an increasing human pressure (land use, buildings, sand mining, dredging) and increasing population. Improving our knowledge on involved mechanisms and sediment transport processes, monitoring the evolution of sedimentary stocks and anticipating changes in littoral and coastal zones is essential for this purpose. The special issue of Water on “Sediment transport in coastal waters” gathers thirteen papers which introduce the current revolution in the scientific research related to coastal and littoral hydrosedimentary dynamics, and reflect the diversity of concerns on which research in coastal sediment transport is based, and current trends — topics and preferred methods — to address them.
Author | : Andrew Manning |
Publisher | : BoD – Books on Demand |
Total Pages | : 347 |
Release | : 2011-10-03 |
Genre | : Science |
ISBN | : 9533075864 |
Download Sediment Transport in Aquatic Environments Book in PDF, ePub and Kindle
Sediment Transport in Aquatic Environments is a book which covers a wide range of topics. The effective management of many aquatic environments, requires a detailed understanding of sediment dynamics. This has both environmental and economic implications, especially where there is any anthropogenic involvement. Numerical models are often the tool used for predicting the transport and fate of sediment movement in these situations, as they can estimate the various spatial and temporal fluxes. However, the physical sedimentary processes can vary quite considerably depending upon whether the local sediments are fully cohesive, non-cohesive, or a mixture of both types. For this reason for more than half a century, scientists, engineers, hydrologists and mathematicians have all been continuing to conduct research into the many aspects which influence sediment transport. These issues range from processes such as erosion and deposition to how sediment process observations can be applied in sediment transport modeling frameworks. This book reports the findings from recent research in applied sediment transport which has been conducted in a wide range of aquatic environments. The research was carried out by researchers who specialize in the transport of sediments and related issues. I highly recommend this textbook to both scientists and engineers who deal with sediment transport issues.
Author | : Bernd Westrich |
Publisher | : Springer Science & Business Media |
Total Pages | : 463 |
Release | : 2007-10-11 |
Genre | : Science |
ISBN | : 3540347852 |
Download Sediment Dynamics and Pollutant Mobility in Rivers Book in PDF, ePub and Kindle
This is the first interdisciplinary book on the mobilization of nutrients and pollutants in the water phase due to hydrodynamic processes. Coverage includes the formation of aggregates in turbulent water; flocks and biofilms from organic reactions; and the formation of new surfaces for re-adsorption of dissolved pollutants. The book gathers papers resulting from an International Symposium on Sediment Dynamics and Pollutant Mobility in River Basins in Hamburg, Germany, March, 2006.
Author | : Nathalie Eugenie Marie Asselman |
Publisher | : 11 45 |
Total Pages | : 282 |
Release | : 1997 |
Genre | : Climatic changes |
ISBN | : |
Download Suspended Sediment in the River Rhine Book in PDF, ePub and Kindle
Author | : Thomas Bianchi |
Publisher | : Cambridge University Press |
Total Pages | : 673 |
Release | : 2014 |
Genre | : Science |
ISBN | : 1107022576 |
Download Biogeochemical Dynamics at Major River-Coastal Interfaces Book in PDF, ePub and Kindle
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.
Author | : G. Seminara |
Publisher | : Springer Science & Business Media |
Total Pages | : 234 |
Release | : 2013-06-29 |
Genre | : Science |
ISBN | : 3662045710 |
Download River, Coastal and Estuarine Morphodynamics Book in PDF, ePub and Kindle
Author | : Johan C Winterwerp |
Publisher | : World Scientific |
Total Pages | : 644 |
Release | : 2021-11-08 |
Genre | : Technology & Engineering |
ISBN | : 9811243646 |
Download Fine Sediment In Open Water: From Fundamentals To Modeling Book in PDF, ePub and Kindle
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)
Author | : Jie Zheng |
Publisher | : |
Total Pages | : 234 |
Release | : 1996 |
Genre | : Beach erosion |
ISBN | : |
Download Improved Cross-shore Sediment Transport Relationships and Models Book in PDF, ePub and Kindle
Author | : Robert George Dean |
Publisher | : |
Total Pages | : 40 |
Release | : 1994 |
Genre | : Beach erosion |
ISBN | : |
Download Cross-shore Sediment Transport Relationships Book in PDF, ePub and Kindle