Tidal phase differences in multi-branch systems and their effect on salt intrusion

The Hollandsche IJssel plays an important role in the freshwater provision of the province Zuid-Holland. Consequently, for Rijkswaterstaat it is key that salt intrusion is minimal in the Hollandsche IJssel. Recent studies noted that salt intrusion in the Hollandsche IJssel is limited due to a phase difference between tidal velocities in the main...

Multi-dimensional Uncertainty Analysis for Proton FLASH Radiotherapy: Including machine-intrinsic uncertainties in pencil beam placement and cyclotron proton beam current

With FLASH proton radiotherapy, healthy tissue is spared more compared to conventional proton therapy. The FLASH effect is present at high fractional doses of more than 8 Gy, at ultra-high mean dose rates of more than 40 Gy per second and at dose delivery times of less than 200 milliseconds. However, particle accelerator intrinsic uncertainties...

An Analytical Model to Determine the Bearing Capacity of Existing Steel-Concrete-Composite Bridges Without Mechanical Connectors

In Amsterdam, more than 30 steel-concrete composite bridges were constructed from 1880-1960 without mechanical connectors and transverse reinforcement. Currently, there are no simplified analytical methods to determine the bearing capacity of these bridges. Thus, the bearing capacity is verified using NLFEM or oversimplified analytical...

An Analysis of the Factors Influencing the Capacity of Constrained Urban Airspace

The traffic density of small aerial vehicles operating within urban environments is expected to increase significantly in the near future. This urban environment is highly constrained due to being limited to the low-altitude airspace directly above the existing road network. To increase understanding of the factors influencing the capacity of...

Towards BIM-based automation of the vertical load calculation

The work processes of structural engineers have been changing over the last decades. Digitalisation and automation play an important role in this change. One of the major developments in this context has been the introduction of Building Information Modelling (BIM). In a BIM model the geometry of the actual building is represented. To this...

Macro-scale performance of a mega-feeder nourishment: Describing and predicting the long-term feeding performance

A mega-feeder nourishment is a concentrated nourishment that disperses over time due to wind, waves, and tide, and as a result ‘feeds’ its adjacent coasts. During the design phase of a nourishment, performance indicators can enable an objective comparison of a mega-feeder nourishment to alternative nourishment strategies, In the case of an...

Effect of removal of the Oosterschelde storm surge barrier

The research objective of this thesis is to determine the new hydrodynamic and morphodynamic situation in case the Oosterschelde storm surge barrier is removed, with emphasis on the development of the intertidal area. To reach the objectives of this study a literature study is performed which describes the impact of the Deltaworks. An analytical...