Searched for: subject:"scour"
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Li, Q. (author)
Although wind energy capacity has increased significantly in the last few decades, the installed capacity of offshore wind turbine still lags far behind that of onshore wind turbines due to the installation and foundation cost. The aim of this research project has been to clarify the influence of combined vertical and lateral loads, lateral...
doctoral thesis 2020
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Li, Q (author), Prendergast, L. J. (author), Askarinejad, A. (author), Chortis, G. (author), Gavin, Kenneth (author)
The majority of offshore wind turbines are founded on large-diameter, open-ended steel monopiles. Monopiles must resist lateral loads and overturning moments because of environmental (wind and wave) actions, whereas vertical loads tend to be comparatively small. Recent developments in turbine sizes and increases in hub heights have resulted...
journal article 2020
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Chortis, G. (author), Askarinejad, A. (author), Prendergast, L.J. (author), Li, Q. (author), Gavin, Kenneth (author)
The influence of scour on the lateral response of monopile foundations for offshore wind turbines is investigated in this paper. Application of lateral load-displacement (p-y) curves to predict the lateral pile behaviour is subject to uncertainty as many of the presently used design approaches have been derived for long, slender piles. These...
journal article 2020
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Gutiérrez, 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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Prendergast, L.J. (author), Limongelli, Maria P. (author), Ademovic, Naida (author), Anžlin, Andrej (author), Gavin, K.G. (author), Zaninil.j.prendergast@tudelft.nl, Mariano (author)
Bridges can be subjected to damaging environmental actions due to flooding and seismic hazards. Flood actions that result in scour are a leading cause of bridge failure, while seismic actions that induce lateral forces may lead to high ductility demand that exceeds pier capacity. When combined, seismic actions and scour can lead to effects...
journal article 2018
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Broekema, Y.B. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)
Scour in the vicinity of a hydraulic structure may compromise its geotechnical stability or that of nearby structures. Much fundamental research has been dedicated to the understanding and prediction of these processes, in order to enable the efficient design of mitigation measures. While most of these efforts consider laterally uniform flows,...
journal article 2018
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Prendergast, L.J. (author), Reale, C. (author), Gavin, Kenneth (author)
The trend for development in the offshore wind sector is towards larger turbines in deeper water. This results in higher wind and wave loads on these dynamically sensitive structures. Monopiles are the preferred foundation solution for offshore wind structures and have a typical expected design life of 20 years. These foundations have strict...
journal article 2018
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Gavin, Kenneth (author), Prendergast, L.J. (author), Stipanovič, Irina (author), Škarič−palič, Sandra (author)
There have been significant developments in the area of vibration-based bridge scour monitoring in recent years. Traditional scour monitoring using either visual assessment or diving inspections are now recognised to be very unreliable and highly subjective. There has been a concerted effort to move towards reliable systems capable of either...
journal article 2018
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Prendergast, Luke J. (author), Gavin, Kenneth (author), Hester, David (author)
Detecting scour by analysing bridge vibrations is receiving an increasing amount of attention in the literature. Others have considered changes in natural frequency to indicate the presence of scour damage; however, little work has been reported on identifying the location of a scour hole based on vibration measurements. In this paper, a...
journal article 2017
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Straathof, J. (author)
Onderzoek naar de ontgrondingen rond brugpijlers met een focus op de ontrgronding rond de pijlers van de Waalbruggen in Nijmegen. Door het graven van een nevengeul ontstaat een andere hydraulische situatie waardoor de bescherming rond de pijler aangepast moet worden.
report 2015
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Van Geer, P.F.C. (author), Van Thiel de Vries, J.S.M. (author), Boers, M. (author), Den Bieman, J.P. (author), McCall, R.T. (author)
This paper presents adaptations to the XBeach model aimed at including the relevant processes for the generation of scour holes at the toe of a revetment. Dutch assessment rules for the safety of sea defenses need to be adjusted to cope with a combination of sandy dunes and hard elements. To that end, the XBeach model is prepared to be...
conference paper 2014
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Nabi, M. (author), De Vriend, H.J. (author), Mosselman, E. (author), Sloff, C.J. (author), Shimizu, Y. (author)
We present a 3-D physics-based high-resolution modeling approach to the dynamics of underwater ripples and dunes. The flow is modeled by large eddy simulation on a Cartesian grid with local refinements. The sediment transport is modeled by computing pickup, transport over the bed, transport in the water column, and deposition of rigid spherical...
journal article 2013
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Blokland, T. (author), Mooijman, P. (author)
Praktijkmetingen van de ontgrondingen bij een afmeerplaats van binnenvaartschepen aan een kade ten gevolge van boegschroefstralen en hoofdschroefstralen.De proeven zijn uitgevoerd in Rotterdam bij de Parkkade, gelegen langs de Nieuwe Maas ten oosten van de Parkhaven. Op 9 april is een proef uitgevoerd met meerdere afvaarten van binnenvaart...
report 2013
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De Sonneville, B. (author), Van Velzen, G. (author), Verheij, H.J. (author), Dorst, K. (author)
Traditional guidelines on rock protection at circular piers predominantly focus on preventing shear failure (by choosing a sufficiently large rock size), winnowing failure (by designing an appropriate filter) and edge failure (by selecting a sufficient extent). In particular areas (e.g. in an eroding river channel or in an area with large-scale...
conference paper 2012
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Das Neves, L. (author), Lopes, M.L. (author), Veloso-Gomes, F. (author), Taveira-Pinto, F. (author)
Unidirectional irregular waves of varying significant wave-height and peak period but with a constant spectral shape (JONSWAP spectrum, ?=3.3) were generated over a sandy 3:20 sloped plane beach to investigate scour fronting a dune erosion control system constructed from geotextiles, slope inclined at 45º. Both passive (i.e., three dune erosion...
conference paper 2012
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Arneson, L.A. (author), Zevenbergen, L.W. (author), Lagasse, P.F. (author), Clopper, P.E. (author)
This document is the fifth edition of HEC-18. It presents the state of knowledge and practice for the design, evaluation and inspection of bridges for scour. There are two companion documents, HEC-20 entitled "Stream Stability at Highway Structures", and HEC-23 entitled "Bridge Scour and Stream Instability Countermeasures". These three documents...
report 2012
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Hoffmans, G. (author), Verheij, H.J. (author)
This paper discusses scour without bed protection, such as propeller scour, two-dimensional horizontal, three-dimensional horizontal scour generated by free jets downstream of gates and outlets, two-dimensional vertical and three-dimensional vertical scour. The flow velocities in two- and three-dimensional propeller and free jets are briefly...
journal article 2011
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Verheij, H. (Henk.Verheij@deltares.nl) (author)
Conventional ship propulsion systems and hydro jets differ in many ways. However, they are both responsible for sailing and manoeuvring of ships in a forward or reverse direction. The hydrodynamic jet is what they have in common, but the characteristics of the jets differ. For example, the outflow velocity of hydro jets is much higher than the...
conference paper 2010
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Louwersheimer, W.F. (author), Verhagen, H.J. (author), Olthof, J. (author)
During the construction of the first Dutch offshore wind farm prototype measurements were performed. These measurements were aimed to monitor the behaviour of the granular filter layer of the scour protection around the mono-piles upon which the wind turbines are founded. These measurements were compared to scale model test results and...
conference paper 2007
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Gent, M.R.A. van (author), Coeveld, E.M. (author)
report 2007
Searched for: subject:"scour"
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