Searched for: subject:"field%5C+measurements"
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Tukker, Jim (author)
During berthing operations vessels use their bow thruster(s) to improve their manoeuvrability, making them less dependent on the assistance of tugboats. The jet from a bow thruster reflects on the quay wall. It is directed towards the bottom where it reflects, causing high flow velocities over the bed. This may scour the nearby bed when it is...
master thesis 2021
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de Vet, P.L.M. (author)
Intertidal flats — regions of estuaries that emerge every tide from the water — form unique ecosystems. Benthic communities living in the bed are a valuable food source for wading birds. Salt marshes present on these flats further enhance the biodiversity. Through the damping of waves, intertidal flats also contribute to the safety of the...
doctoral thesis 2020
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Cantoni, Irene (author)
During mooring operations, ships tend to make an extensive use of bowthruster in order to minimize the need for tug assistance. Jet caused by transverse thrusters directly impinges quay walls, and can cause scour on the bed, therefore threatening structural stability of quay walls. Presence of vertical quay walls induces reflection of...
master thesis 2020
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Shi, Can (author), Zhao, Chunfa (author), Yang, Yang (author), Guo, Y. (author), Zhang, Xu (author), Feng, Yang (author)
To probe into the mechanical behaviour of railway transition zone from the macro-meso aspects, a numerical model of transition zone is built that hybrids the Discrete Element Method (DEM) and Finite Difference Method (FDM). The DEM is utilised to simulate the ballast bed and sleeper, because it can consider the realistic ballast shapes and...
journal article 2020
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Spoelstra, A.M.C.M.G. (author), Mahalingesh, N. (author), Sciacchitano, A. (author)
An on-site Ring of Fire (RoF) experiment is performed at the Tom Dumoulin bike park in Sittard-Geleen, the Netherlands. The current work investigates the aerodynamic drag of a cyclist following a lead cyclist at different lateral and longitudinal separations; additionally, the athletes’ skills to maintain their position and distance with respect...
journal article 2020
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de Wit, F.P. (author), Tissier, M.F.S. (author), Reniers, A.J.H.M. (author)
The nonlinear wave shape, expressed by skewness and asymmetry, can be calculated from surface elevation or pressure time series using bispectral analysis. Here, it is shown that the same analysis technique can be used to calculate the bound superharmonic wave height. Using measured near-bed pressures from three different field experiments, it...
journal article 2020
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Oosterlo, P. (author), Hofland, B. (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author)
Oosterlo et al. (2019) developed a system using two terrestrial laser scanners, which can measure run-up heights, depths and velocities of waves on a dike in field situations. The system has now been placed next to two overtopping tanks on a dike in the Eems-Dollard estuary in the Netherlands to measure during actual severe winter storms. The...
abstract 2020
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Tas, S.A.J. (author), van Maren, D.S. (author), Reniers, A.J.H.M. (author)
Cheniers are important for stabilising mud-dominated coastlines. A chenier is a body of wave-reworked, coarse-grained sediment consisting of sand and shells overlying a muddy substrate. In this paper we present and analyse a week of field observations of the dynamics of a single chenier along the coast of Demak, Indonesia. Despite relatively...
journal article 2020
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Grossmann, Florian (author)
Velocities derived from X-band radar were compared to depth averaged ADCP measurements in a complex tidal inlet system at Ameland, the Netherlands. Inclusion of depth assimilation and ensemble averaging in radar calculations led to smaller differences between ADCP and radar. The observed differences were clustered and related to water level...
master thesis 2019
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Oosterlo, P. (author), Hofland, B. (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author), Nieuwenhuis, Jan-Willem (author), van Vledder, G.P. (author), Steetzel, Henk (author), Reneerkens, Michiel (author)
Wave overtopping is commonly measured using overtopping tanks. In this paper, an alternative system is developed by using two laser scanners. It measures wave run-up, as well as layer thicknesses and front velocities, both during normally and obliquely incident waves on a dike in the field. The paper considers the first field validation tests...
conference paper 2019
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Oosterlo, P. (author), Hofland, B. (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author), Nieuwenhuis, Jan-Willem (author), van Vledder, G.P. (author), Steetzel, Henk (author), Reneerkens, Michiel (author)
abstract 2019
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Wikkerink, D.P. (author), Mor, A. R. (author), Polinder, H. (author), Ross, Robert (author)
In order to avoid detection by sea mines, the magnetic signature of merchant and naval vessels can be reduced by running a current through a set of on-board copper coils. This process is called degaussing. Studies have shown that the volume, weight and energy losses of a degaussing system can be reduced by replacing the copper coils with high...
conference paper 2019
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de Wit, F.P. (author), Tissier, M.F.S. (author), Reniers, A.J.H.M. (author)
Field measurements of waves and currents were obtained at ten locations on an ebb-tidal shoal seaward of Ameland Inlet for a six-week period. These measurements were used to investigate the evolution of the near-bed velocity skewness and asymmetry, as these are important drivers for wave-induced sediment tranport. Wave shape parameters were...
journal article 2019
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Spoelstra, A.M.C.M.G. (author), Terra, W. (author), Sciacchitano, A. (author)
A novel measurement system, the Ring of Fire, is deployed which enables the aerodynamic drag estimation of transiting cyclists. The system relies upon the use of large-scale stereoscopic PIV and the conservation of momentum within a control volume in a frame of reference moving with the athlete. The rider cycles at a velocity of approximately 8...
conference paper 2018
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Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, B. (author), van Vledder, G.P. (author)
abstract 2018
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Spoelstra, Alexander (author)
A novel measurement system, the Ring of Fire, is deployed which enables the aerodynamic drag estimation of transiting cyclists. The system relies upon the use of large-scale stereoscopic PIV and the conservation of momentum within a control volume in a frame of reference moving with the athlete. The rider cycles at a velocity of approximately 8...
master thesis 2017
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Hoonhout, B.M. (author)
This thesis explores the nature of aeolian sediment availability and its influence on aeolian sediment transport. The aim is to improve large scale and long term aeolian sediment transport estimates in (nourished) coastal environments. The generally poor performance of aeolian sediment transport models with respect to measurements in coastal...
doctoral thesis 2017
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Hoonhout, B.M. (author), de Vries, S. (author)
Spatial variations in aeolian sediment transport were measured at the Sand Motor mega nourishment in The Netherlands during a six week field campaign in the fall of 2014. A consistent significant increase in sediment transport in downwind direction (positive gradient) was measured over the intertidal beach area, indicating that the intertidal...
journal article 2017
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de Vet, P.L.M. (author), van Prooijen, B.C. (author), Schrijvershof, R. (author), van der Werf, JJ (author), Schrijver, MC (author), Wang, Z.B. (author)
The flow velocities in tidal channels are already rather complex by the presence of various tidal components, wind driven flow and estuarine circulations. An extra level of complexity is introduced when the flow on top of an intertidal<br/>flat is considered (Le Hir, 2000). This research aims at understanding the complex flow patterns on top of...
abstract 2016
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Liu, X. (author), Markine, V.L. (author), Shevtsov, I. (author), Dollevoet, R.P.B.J. (author)
The continuous increasing demand of public transportation capacity requires the railway network operating in tight schedule. The high transporting volumes not only aggravate the degradation of railway infrastructure but also shorten the time for maintenance. Well-arranged infrastructure maintenance contributes to the budget reduction and...
conference paper 2015
Searched for: subject:"field%5C+measurements"
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