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Oosterlo, P. (author), McCall, R.T. (author), Vuik, V. (author), Hofland, Bas (author), van der Meer, J.W. (author), Jonkman, Sebastiaan N. (author)Shallow foreshores in front of coastal dikes can reduce the probability of dike failure due to wave overtopping. A probabilistic model framework is presented, which is capable of including complex hydrodynamics like infragravity waves, and morphological changes of a sandy foreshore during severe storms in the calculations of the probability of...journal article 2018
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Zhu, Zhenchang (author), Vuik, V. (author), Visser, P.J. (author), Soens, Tim (author), van Wesenbeeck, B (author), van de Koppel, Johan (author), Jonkman, Sebastiaan N. (author), Temmerman, Stijn (author), Bouma, T.J. (author)Global change amplifies coastal flood risks and motivates a paradigm shift towards nature-based coastal defence, where engineered structures are supplemented with coastal wetlands such as saltmarshes. Although experiments and models indicate that such natural defences can attenuate storm waves, there is still limited field evidence on how...journal article 2020
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Hu, Zhan (author), Willemsen, Pim W.J.M. (author), Borsje, Bas W. (author), Wang, Chen (author), Wang, Heng (author), Van Der Wal, Daphne (author), Zhu, Zhenchang (author), Vuik, V. (author), Bouma, Tjeerd J. (author)Tidal flats provide valuable ecosystem services such as flood protection and carbon sequestration. Erosion and accretion processes govern the ecogeomorphic evolution of intertidal ecosystems (marshes and bare flats) and, hence, substantially affect their valuable ecosystem services. To understand the intertidal ecosystem development, high...journal article 2021
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Hiemstra, K.S. (author), van Vuren, S. (author), Vinke, Frederik R.S. (author), Jorissen, Richard E. (author), Kok, M. (author)Worldwide, rivers provide important socio-economic and environmental functions and are essential to human well-being. The growing demand of user-functions and the change in river conditions due to large-scale morphology and climate change, increase the pressure on lowland river systems (e.g. Rhine, Meuse, Danube and Mississippi). To ensure a...journal article 2020
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Ton, A.M. (author), Vuik, V. (author), Aarninkhof, S.G.J. (author)The morphodynamic behaviour of low-energy beaches is poorly understood, compared to that of exposed coasts. This study analyses the morphological development of sandy, low-energy beaches and the steering hydrodynamic processes. Four densely-monitored study sites in the non-tidal lake Markermeer in the Netherlands offered a unique opportunity...journal article 2021
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Pol, J.C. (author), Kanning, W. (author), Jonkman, Sebastiaan N. (author)This paper presents a large-scale backward erosion piping experiment aimed at studying the erosion rate. This temporal aspect of piping complements previous research that focused on the critical head. To study the progression rate in realistic conditions, an experiment was carried out on a 1.8 m high levee with a cohesive blanket on a sandy...journal article 2021
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Geotechnical aspects of offshore wind turbine dynamics from 3D non-linear soil-structure simulationsKementzetzidis, E. (author), Corciulo, Simone (author), Versteijlen, Willem G. (author), Pisano, F. (author)The development of the offshore wind industry is motivating substantial research efforts worldwide, where offshore wind turbines (OWTs) of increasing size are being installed in deeper water depths. Foundation design is a major factor affecting the structural performance of OWTs, with most installations founded to date on large-diameter...journal article 2019
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Sensitivity of the seismic response of monopile-supported offshore wind turbines to soil variabilityPanagoulias, S. (author), de Winter, C. (author), Navalkar, S.T. (author), Nernheim, A. (author)The expansion of the offshore wind industry in areas with high seismicity has led to engineering challenges related to the design of the offshore wind turbines (OWTs). Monopiles, i.e., tubular steel piles of large outer diameter, low aspect ratio (penetration depth over outer diameter), and relatively thin pile wall, are traditionally the...journal article 2023
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van Denderen, R. Pepijn (author), Kater, Emiel (author), Jans, Luc H. (author), Schielen, R.M.J. (author)The river bed level in low-land rivers like the Rhine branches in The Netherlands changes continuously on various spatial and temporal scales. Large-scale degradation occurs in many rivers due to river-wide engineering interventions, such as channelization, in the last decades and centuries. Local river interventions, such as the construction...journal article 2022
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van Til, J. (author), Alijani, F. (author), Voormeeren, S. N. (author), Lacarbonara, W. (author)Nonsmooth dynamics of a Tuned Mass Damper system with lateral stops are studied using an alternating frequency/time harmonic balancing (AFT-HB) method. To this end, an extremely stiff end stop nonlinearity is considered. The application range of AFT-HB is investigated by including up to 250 harmonics in the external force, as well as in the...journal article 2019
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Brinkgreve, R.B.J. (author), Lisi, Diego (author), Lahoz, Miquel (author), Panagoulias, S. (author)The PISA (Pile Soil Analysis) research project has resulted in a new methodology for the design of offshore wind turbine monopile foundations. A new software tool called PLAXIS Monopile Designer (MoDeTo) has been developed that automates the PISA design methodology. It facilitates the calibration of the so-called soil reaction curves by...journal article 2020
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Armstrong, Michael (author), Ravasio, Matteo (author), Versteijlen, W.G. (author), Verschuur, D.J. (author), Metrikine, A. (author), van Dalen, K.N. (author)Determination of soil material damping is known to be difficult and uncertain, especially in the offshore environment. Using an advanced inversion methodology based on multichannel spectral analysis, Scholte and Love wave measurements are used to characterize subsea soil from a North Sea site. After normalization, a determinant-based objective...journal article 2020
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Pol, J.C. (author)The Shields–Darcy (SD) model by Hoffmans and Van Rijn (Citation2018) describes the resistance of hydraulic structures to backward erosion piping, which is a form of internal erosion. In the article being discussed, Hoffmans compares the SD model to the model by Sellmeijer et al. (Citation2011), focusing on field scales. This Discussion presents...journal article 2023
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van Koppen, L.M. (author), Dugulan, A.I. (author), Hensen, Emiel J.M. (author), Bezemer, G. Leendert (author)Cobalt oxidation is a relevant deactivation pathway of titania-supported cobalt catalysts used in Fischer-Tropsch synthesis (FTS). To work towards more stable catalysts, we studied the effect of the surface area of the titania support and noble metal promotion on cobalt oxidation under simulated high conversion conditions. Mössbauer...journal article 2024
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van Koppen, L.M. (author), Dugulan, A.I. (author), Leendert Bezemer, G. (author), Hensen, Emiel J.M. (author)The study of titania-supported cobalt nanoparticles is relevant for industrial Fischer-Tropsch synthesis (FTS). Herein, we report about various deactivation pathways of cobalt supported on P25 titania (cobalt loading 2–8 wt%) under simulated high conversion conditions using in situ Mössbauer spectroscopy. A fraction of metallic cobalt was...journal article 2023
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van Koppen, L.M. (author), Dugulan, A.I. (author), Hensen, Emiel J.M. (author), Bezemer, G. Leendert (author)The commercial application of cobalt-based Fischer-Tropsch synthesis (FTS) suffers from catalyst deactivation. One of the main deactivation mechanisms under industrial conditions is sintering. In this work, we explored the role of manganese oxide as a structural promoter against sintering in a carbon nanofiber supported cobalt model catalyst....journal article 2022
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Gonugunta, P. (author), Dugulan, A.I. (author), Bezemer, G. Leendert (author), Brück, E.H. (author)Operando spectroscopic techniques (Diffusive Reflective Infrared Fourier-Transform and Mössbauer emission spectroscopy) were combined to investigate the role of oxygenates deposition on deactivation of cobalt on titania Fischer-Tropsch catalysts at high pressure. Clear formation of carboxylates was seen for catalysts prepared via both...journal article 2021
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van Koppen, L.M. (author), Dugulan, A.I. (author), Leendert Bezemer, G. (author), Hensen, Emiel J.M. (author)Understanding the deactivation mechanism of cobalt-based Fischer-Tropsch catalysts is of significant practical importance. Herein, we explored the role of manganese as a structural promoter on silica-supported cobalt nanoparticles under simulated high CO conversion conditions, i.e., high relative humidity. The structural changes in cobalt...journal article 2023
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Wu, C.L. (author), Wagterveld, R. M. (author), van Breukelen, B.M. (author)Petroleum products have contaminated groundwater with harmful organic compounds, such as benzene, toluene, ethylbenzene, and xylenes (BTEX). Collecting and analyzing polluted groundwater samples is expensive and undertaken infrequently. However, quick remedial action in case of unexpected events requires continuous monitoring. In-situ water...journal article 2024
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Allison, A. E.F. (author), Lawrence, J. H. (author), Stephens, S. A. (author), Kwakkel, J.H. (author), Singh, S. K. (author), Blackett, P. (author), Stroombergen, A. (author)Infrastructure in low-lying coastal areas faces challenges from climate change, sea level rise, and the impact of compound hazards. Dynamic adaptive pathways planning (DAPP) is increasingly being applied as a way of planning under deep uncertainty. Stress testing for robustness is an integral part of DAPP which provides decision-makers with...journal article 2024