Searched for: subject:"turbidity"
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Gutierrez Marin, Juan Pablo (author), van Halem, D. (author), Uijttewaal, W.S.J. (author), del Risco, Efraín (author), Rietveld, L.C. (author)
As a consequence of the suspended sediments in river water, cake formation on the streambed and clogging of the aquifer may occur, leading to a decline in the production yield of riverbank filtration systems, particularly in highly turbid river waters. However, naturally occurring flow forces may induce sufficient scouring of the streambed,...
journal article 2018
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Kumar, M. (author)
doctoral thesis 2018
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van der Horst, J. (author)
Optical imaging is one of the primary tools in biological and medical research. Over the years many different optical imaging modalities have been developed that have driven the imaging performance in terms of image resolution, contrast, imaging time, and maximum allowed sample size. The goal of this work is to develop techniques for 3D optical...
doctoral thesis 2018
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Wei, X. (author), Kumar, M. (author), Schuttelaars, H.M. (author)
To investigate the dominant sediment transport and trapping mechanisms, a semi-analytical three-dimensional model is developed resolving the dynamic effects of salt intrusion on sediment in well-mixed estuaries in morphodynamic equilibrium. As a study case, a schematized estuary with a converging width and a channel-shoal structure...
journal article 2018
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Wei, X. (author)
Estuaries are important ecosystems accommodating a large variety of living species. Estuaries are also important to people by their demand of freshwater for drinking, irrigation, and industry. Due to natural changes and human activities, the estuarine water quality, influenced by both salinity and turbidity (the cloudiness or haziness of water),...
doctoral thesis 2017
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Guo, Chao (author), He, Qing (author), Guo, Leicheng (author), Winterwerp, J.C. (author)
In order to improve our understandings of temporal and vertical variations of sediment flocculation dynamics within the turbidity maxima (TM) of the highly turbid Yangtze Estuary (YE), we deployed LISST-100C, a laser instrument for in-situ monitor of the sizes and concentrations of flocculated particles in a wet season. Field data in terms of...
journal article 2017
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Winterwerp, J.C. (author), Vroom, J (author), Wang, Zhengbing (author), Krebs, Martin (author), Hendriks, H.C.M. (author), van Maren, D.S. (author), Schrottke, Kerstin (author), Borgsmüller, Christine (author), Schöl, Andreas (author)
In this paper, we analyse the behaviour of fine sediments in the hyper-turbid Lower Ems River, with focus on the river’s upper reaches, a stretch of about 25 km up-estuary of Terborg. Our analysis is based on long records of suspended particulate matter (SPM) from optical backscatter (OBS) measurements close to the bed at seven stations along...
journal article 2017
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Winterwerp, J.C. (author), Vroom, J. (author), Wang, Zhengbing (author), Krebs, Martin (author)
abstract 2016
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Radermacher, M. (author), De Wit, L. (author), Uijttewaal, W.S.J. (author), Winterwerp, J.C. (author)
When dredging in sensitive environments, efforts have to be made to limit the free dispersal of suspended fine sediment from the dredging spill. Especially the use of hanging silt curtains as an environmental mitigation measure is widespread. Despite frequent application, their ability to reduce turbidity levels through vertical diversion of...
journal article 2015
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Yu, Q. (author), Chen, Y. (author), Liu, Z. (author), Van de Giesen, N.C. (author), Zhu, D. (author)
Algal blooms have been frequently found at the upper reaches of the Tanglang River, which is downstream from the eutrophic Dianchi Lake. The eutrophic lake upstream is considered to be a potential source of phytoplankton, which contributes to the development of harmful algal blooms in the river downstream and can cause many serious problems for...
journal article 2015
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De Lucas Pardo, M.A. (author), Sarpe, D. (author), Winterwerp, J.C. (author)
Lake Markermeer, a large shallow lake in The Netherlands, suffers from turbidity and ecology problems. As part of a study aiming to mitigate these problems, we study flocculation processes in the lake; in particular, the possible mutual flocculation between algae and re-suspended bed sediments. We show that sediment re-suspended from the bed of...
journal article 2015
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Van Maren, D.S. (author), Winterwerp, J.C. (author), Vroom, J. (author)
Deepening of estuarine tidal channels often leads to tidal amplification and increasing fine sediment import. Increasing fine sediment import, in turn, may lower the hydraulic drag (due to a smoother muddy bed and/or sediment-induced damping of turbulence), and therefore, further strengthen tidal amplification, setting in motion a process in...
journal article 2015
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Wang, X. (author)
Passive continental margins display a great diversity of seafloor bathymetries induced by gravity driven extensional faulting and compressional folding, as well as diapiric movements of salt or mud. In many diapirically controlled settings, slope bathymetries are complicated and characterized by numerous ridges, trenches and minibasins such as...
doctoral thesis 2015
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De Wit, L. (author)
3D CFD simulations, lab experiments and field measurements are used to get more understanding of the turbulent near field overflow dredging plume mixing. The focus has been on the most often used dredging vessel: a trailing suction hopper dredger (TSHD). Near field overflow dredging plume mixing is important because it determines the far field...
doctoral thesis 2015
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Yu, Q. (author), Wang, Y. (author), Gao, J. (author), Gao, S. (author), Flemming, B. (author)
Traditionally, vertical circulation (induced by gravity circulation and tidal straining), tidal pumping, and resuspension are suggested as the major processes for the formation and maintenance of the estuarine turbidity maximum (ETM). Due to strong mixing, tidal pumping is considered as the dominating process in macrotidal estuaries. To analyze...
journal article 2014
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Antonello, J. (author)
Microscopy is an essential tool for life sciences. Thanks to the development of confocal and multiphoton microscopy, scientists are able to obtain high-resolution 3D views of biological specimens. Nevertheless, spatial variations in the index of refraction within specimens cause aberrations that degrade the quality of the 3D views. One can...
doctoral thesis 2014
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Antonello, J. (author), Van Werkhoven, T. (author), Verhaegen, M. (author), Truong, H.H. (author), Keller, C.U. (author), Gerritsen, H.C. (author)
Optical aberrations have detrimental effects in multiphoton microscopy. These effects can be curtailed by implementing model-based wavefront sensorless adaptive optics, which only requires the addition of a wavefront shaping device, such as a deformable mirror (DM) to an existing microscope. The aberration correction is achieved by maximizing a...
journal article 2014
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Van Werkhoven, T.I.M. (author), Antonello, J. (author), Truong, H.H. (author), Verhaegen, M. (author), Gerritsen, H.C. (author), Keller, C.U. (author)
Deep imaging in turbid media such as biological tissue is challenging due to scattering and optical aberrations. Adaptive optics has the potential to compensate the tissue aberrations. We present a wavefront sensing scheme for multi-photon scanning microscopes using the pulsed, near-infrared light reflected back from the sample utilising...
journal article 2014
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Rombouts, P.M.M. (author), Schilperoort, R. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)
The objective of this paper is to demonstrate the applicability of, and need for, surrogate sensors as robust sensors for water quality based RTC. For this purpose 1.5 years of level, conductivity (EC) and turbidity (TU) measurements at 9 combined sewer overflow (CSO) locations have been performed and analysed to determine the most polluted CSO...
conference paper 2013
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de Wit, L. (author)
conference paper 2013
Searched for: subject:"turbidity"
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