Porphyrin–Nanodiamond Hybrid Materials—Active, Stable and Reusable Cyclohexene Oxidation Catalysts

The quest for active, yet “green” non-toxic catalysts is a continuous challenge. In this work, covalently linked hybrid porphyrin–nanodiamonds were prepared via ipso nitro substitution reaction and characterized by X-ray photoelectron spectroscopy (XPS), fluorescence spectroscopy, infrared spectroscopy (IR) and thermogravimetry-differential...

A quantitative assessment of human interventions and climate change on the West African sediment budget

The West African coastal barrier is maintained by significant wave-driven longshore sand transport. This sand originates from rivers and large coastal sand deposits. Today, however, much of the fluvial sand is trapped behind river dams and/or interrupted at several locations by port jetties. As a result, the sandy coastal barrier is eroding...

Performance evaluation of wave input reduction techniques for modeling inter-annual sandbar dynamics

In process-based numerical models, reducing the amount of input parameters, known as input reduction (IR), is often required to reduce the computational effort of these models and to enable long-term, ensemble predictions. Currently, a comprehensive performance assessment of IR-methods is lacking, which hampers guidance on selecting suitable...

Storm hindcasts for Wadden Sea: Hindcasts in inlet systems of Ameland and Norderney and Lunenburg Bay

Extreme wave statistics: Methodology and applications to North Sea wave data

Storm hindcasts Norderneyer Seegat and Amelander Zeegat

Maximale significante golfhoogte bij ondiep water en maximale golfsteilheid

Het onderhavige onderzoek is uitgevoerd in het kader van het meerjarige project "Advisering steenbekledingen Zeeland" voor het Projectbureau Zeeweringen (PBZ). Voor het ontwerpen van steenzettingen met Steentoets wordt door PBZ in Zeeland gebruik gemaakt van correcties op de uit 1997 stammende golfcondities, die destijds met SWAN zijn berekend ...

A comparative simulation study of the annual maxima and the peaks-over-threshold methods

In order to assess their relative merits in the context of the determinalion of Hydraulic Boundary Conditions (HBC), the Annual Maxima / Generalized Extreme Value distribution (AM/GEV) and Peaks over Threshold / Generalized Pareto Oislribution (POT/GPO) approaches are compared in terms of Iheir accuracy, as measured by mean square errors, in...

On the determination of the temporal and spatial evolution of extreme events

The current computations of the Hydraulic Boundary Conditions rely mostly on the distribution of the basic variables at the peak of the storms. As a means of improving the quality of the numerical modelling with a view towards the 2017 assessment, it is envisaged that the numerical models (e.g. the wave model) will in the future use time and...

Extreme wave statistics: Confidence intervals

Plan of approach SBW wind modelling

This report presents the joint KNMI and Deltares Plan of Approach for the wind modelling activities for the coming years, with the goal to determine time and spatially varying extreme wind fields. These are required as input for the 2017 safety assessment of the primary water defences. The objectives of the project have been defined as follows:...