Searched for: subject:"sediments"
(1 - 20 of 474)

Pages

document
Amiri Simkooei, A. (author), Koop, L. (author), van der Reijden, K. J. (author), Snellen, M. (author), Simons, D.G. (author)
Seafloor characterization using multibeam echosounder (MBES) backscatter data is an active field of research. The observed backscatter curve (OBC) is used in an inversion algorithm with available physics-based models to determine the seafloor geoacoustic parameters. A complication is that the OBC cannot directly be coupled to the modeled...
journal article 2019
document
Oueslati, Walid (author), Van De Velde, Sebastiaan (author), Helali, M. Amine (author), Added, Ayed (author), Aleya, Lotfi (author), Meysman, F.J.R. (author)
Coastal lagoon sediments are important for the biogeochemical carbon cycle at the land-ocean transition, as they form hotspots for organic carbon burial, as well as potential sites for authigenic carbonate formation. Here, we employ an early diagenetic model to quantify the coupled redox cycling of carbon, iron and sulphur in the sediments...
journal article 2019
document
Huisman, B.J.A. (author)
Increasingly large sand nourishments are used for the maintenance of sandy coasts around the world. There is, however, still very limited understanding of their behaviour (i.e. redistribution) and effects on the marine environment. This PhD thesis explores the morphological reshaping of shoreface nourishments (i.e. long bunds of sand placed at...
doctoral thesis 2019
document
Koop, L. (author), Amiri Simkooei, A. (author), van der Reijden, K. J. (author), O’Flynn, Sarah (author), Snellen, M. (author), Simons, D.G. (author)
High resolution maps of sandy seafloors are valuable to understand seafloor dynamics, plan engineering projects, and create detailed benthic habitat maps. This paper presents multibeam echosounder backscatter classification results of the Brown Bank area of the North Sea. We apply the Bayesian classification method in a megaripple and sand...
journal article 2019
document
Hoonhout, B.M. (author), de Vries, S. (author)
Mega nourishments are a novel approach to stimulating coastal safety and resilience. Mega nourishments are intended to spread along the coast on a decadal time scale by natural sediment transport processes with a minimum of intrusion into the natural coastal system. The supratidal morphodynamic behaviour of mega nourishments is not well...
journal article 2019
document
Baptist, Martin J. (author), Gerkema, T (author), van Prooijen, Bram (author), van Maren, D.S. (author), Colosimo, I. (author), Elschot, K. (author), de Groot, A. V. (author), Cleveringa, J. (author), van Eekelen, E. M.M. (author), More Authors (author)
We test an innovative approach to beneficially re-use dredged sediment to enhance salt marsh development. A Mud Motor is a dredged sediment disposal in the form of a semi-continuous source of mud in a shallow tidal channel allowing natural processes to disperse the sediment to nearby mudflats and salt marshes. We describe the various steps in...
journal article 2019
document
Maan, D.C. (author), van Prooijen, Bram (author), Wang, Zhengbing (author)
We use the results of a one-dimensional morphodynamic model and the basis of the “Lagrangian equilibrium state” (Maan et al., 2015, https://doi.org/10.1002/2014JF003311) to derive a quantitative relationship between the progradation speed of tidal flats and the suspended sediment concentration in their adjacent waters and show that the speed...
journal article 2019
document
Meirelles, Saulo (author)
This thesis examines the effects of the stratified tidal flow on the morphodynamics of the Dutch inner shelf. The south portion of the Dutch inner shelf is strongly influenced by the Rhine River ROFI (Region Of Freshwater Influence), which is generated by the discharge from the Rhine River through the Rotterdam waterways. Under stratified...
doctoral thesis 2019
document
de Boer, W.P. (author), Mao, Yongjing (author), Hagenaars, Gerben (author), de Vries, S. (author), Slinger, J (author), Vellinga, T. (author)
In Africa, several new seaport developments are being considered. In sedimentary environments, such port developments can have adverse impacts on the evolution of adjacent coastlines. To learn from past port engineering practice, we created a unique database containing the coastline evolution and characteristics of 130 existing African seaports....
journal article 2019
document
Dijkstra, Y.M. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author)
Many estuaries are strongly deepened to improve navigation, with sometimes large and poorly understood consequences to suspended sediment dynamics. To improve understanding of such large changes, we study the Ems River Estuary, where a regime shift from low to high sediment concentrations was observed after deepening. The aim of this study is...
journal article 2019
document
Vanlede, J.D.S.M. (author), Dujardin, Arvid (author), Fettweis, Michael (author), van Hoestenberghe, Thomas (author), Martens, Chantal (author)
This paper presents the mud dynamics in the harbor basin of Zeebrugge in the Southern North Sea based on an analysis of field data. Mud is typically transported into and within the harbor basin through advection of suspended particulate matter (SPM). Three important timescales have been identified. On the intratidal timescale, sediment import...
journal article 2019
document
Cordier, F. (author), Tassi, Pablo (author), Claude, N (author), Crosato, A. (author), Rodrigues, S (author), Pham Van Bang, D. (author)
Rivers typically present heterogeneous bed material, but the effects of sediment nonuniformity on river bar characteristics are still unclear. This work investigates the impact of sediment size heterogeneity on alternate bars with a morphodynamic numerical model. The model is first used to reproduce a laboratory experiment showing alternate...
journal article 2019
document
Bregoli, F. (author), Crosato, A. (author), Paron, Paolo (author), McClain, M.E. (author)
The Lower Mara River and Wetland, Tanzania, is an important ecosystem and unique water resource for a vast semi-arid area. The river, an affluent of Lake Victoria, and the wetland are experiencing morphological and vegetation changes resulting in channel avulsions and wetland expansion. This study analyses the changes over the last 100 years...
journal article 2019
document
de Vet, P.L.M. (author), Boersema, Matthijs (author), Bouma, T.J. (author), Nolte, A. J. (author), Schrijvershof, R. A. (author), Soissons, L. M. (author), Stronkhorst, J (author), van Zanten, E. (author), Ysebaert, Tom (author)
The Eastern Scheldt, a tidal basin in the southwest of The Netherlands, underwent large physical and ecological changes due to a system-wide human interference. The construction of a storm surge barrier at the seaward side and closure of the upstream branches in the 1980s resulted in intertidal flat erosion. This has far reaching consequences...
journal article 2019
document
Montes, Carlos (author), Kapelan, Z. (author), Saldarriaga, Juan (author)
This paper aims to analyze different sediment self-cleansing criteria and to find out what the corresponding implications are on the optimal design of sewer systems. A methodology based on enumeration is used to find the sewer network design that minimizes the costs of construction while fulfilling a number of design criteria including self...
journal article 2019
document
Guo, Leicheng (author), Wang, Zhengbing (author), Townend, Ian (author), He, Qing (author)
Tidal wave deformation and tidal asymmetry widely occur in tidal estuaries and lagoons. Tidal asymmetry has been intensively studied because of its controlling role on residual sediment transport and large‐scale morphological evolution. There are several methods available to characterize tidal asymmetry prompting the need for an overview of...
journal article 2019
document
Brand, Evelien (author), De Sloover, Lars (author), De Wulf, Alain (author), Montreuil, Anne Lise (author), Vos, S.E. (author), Chen, Margaret (author)
Sediment transport is a key element in intertidal beach morphodynamics, but measurements of sediment transport are often unreliable. The aim of this study is to quantify and investigate cross-shore sediment transport and the resulting topographic changes for a tide-dominated, sandy beach. Two fortnight-long field experiments were carried out...
journal article 2019
document
Dijkstra, Y.M. (author), Schuttelaars, H.M. (author), Schramkowski, G.P. (author), Brouwer, R.L. (author)
Many estuaries are strongly modified by human interventions, including substantive channel deepening. In the Ems River Estuary (Germany and Netherlands), channel deepening between the 1960s and early 2000s coincided with an increase in the maximum near-bed suspended sediment concentration from moderate (∼1 kg/m <sup>3</sup> ) to high (&gt;10...
journal article 2019
document
Wengrove, M. E. (author), Foster, D. L. (author), Lippmann, T. C. (author), de Schipper, M.A. (author), Calantoni, J. (author)
Bedload transport is an important mechanism for sediment flux in the nearshore. Yet few studies examine the relationship between bedform evolution and net sediment transport. Our work contributes concurrent observations of bedform mobility and bedload transport in response to wave dominant, current dominant, and combined wave-current flows in...
journal article 2019
document
Cozzoli, Francesco (author), Gjoni, Vojsava (author), Del Pasqua, Michela (author), Hu, Zhan (author), Ysebaert, Tom (author), Herman, P.M.J. (author), Bouma, T. (author)
Macrozoobenthos may affect sediment stability and erodibility via their bioturbating activities, thereby impacting both the short- and long-term development of coastal morphology. Process-based models accounting for the effect of bioturbation are needed for the modelling of erosion dynamics. With this work, we explore whether the fundamental...
journal article 2019
Searched for: subject:"sediments"
(1 - 20 of 474)

Pages