Determining the mechanisms causing the hydraulic damping during ship berthing: Comprehending the water cushion effect

When a large ship enters a port the vessel is navigated by the pilots instead of the captain due to safety reasons. The final part of the berthing manoeuver is the most critical and consists of the vessel moving laterally towards the quay wall. At this point the vessel does not use its own propulsion force anymore but is pushed by the tugboats....

Experimental research of pore water pressure fluctuation on the stability of submarine slopes: A case study of the Eastern Scheldt storm surge barrier

In this report, an experimental investigation of the influence of currents on submarine slope stability is presented for the Eastern Scheldt storm surge barrier case. Slope instabilities, including liquefaction failures, have been observed in the scour hole slopes near this barrier. The currents above the sloping bed are expected to initiate the...

Schematisation of discharge time series in morphodynamic river models

River discharge is an essential parameter in morphodynamic modelling. It proves to be highly variable in both time and space. In this thesis the impact of the schematisation of time-dependent discharge series on morphodynamic change is studied. The impact is governed by several factors such as the long-term discharge statistics, and both short-...

Flow over and around submerged groynes: Numerical modelling and analysis of a groyne flume experiment

In submerged conditions groynes add resistance to a river, thereby increasing the water levels for a particular discharge. Groynes are modelled in two ways, either they are included in the bed topography when the grid resolution is sufficiently high or with a sub-grid parametrisation when the grid cell-size is larger than the geometry of the...

Interaction between Liquefying Submerged Slope and Submerging Water Mass

The thesis presents a numerical study on dredging induced undrained instability and subsequent static liquefaction of submarine landslides. For the study, a pre-existing hydro-dynamic uncoupled submarine slope numerical model, developed by Molenkamp (1999), has been modified to incorporate a fully hydro-dynamic coupled interaction between...

Evaluating the applicability of 2DH models for the prediction of mega nourishments: A case study of the Hondsbossche Dunes

In 2003 certain areas of the Dutch coast were found not to meet contemporary safety standards, as a result of erosion that occurred over the last century. One of these 'weak links' stretches from Camperduin to Petten and is known as the Hondsebossche Pettemer Zeewering; a former 'hard' sea dyke with a stone revetment. To fortify this 12...

A new modelling method for representing the effect of spiral flow on the bed shear stress

This thesis presents a new methodology for representing the effect of spiral flow on the bed shear stress magnitude and direction, using a low-vertical-resolution three-dimensional model. Furthermore, it discusses the performance of the new methodology in comparison with conventional high-vertical-resolution three-dimensional and depth-averaged...

Analyzing the influence of compound events on flooding in the downstream reach of the Houston Ship Channel

Flooding is one of the most frequent and terrible natural disasters. For the coastal areas connecting inland with the open sea, the occurrence of flooding could be caused by high flows from inland rivers or high-water levels at open sea (e.g., from tsunamis or storm surge). There is also one extreme case that high sea level and high inland flow...

Improving the filling jet schematisation through a lock door by taking into account the presence of a ship

This study treats the calculation of longitudinal forces on a ship in a lock chamber due to the levelling procedure. The focus will be on the force resulting from the filling jet through the levelling door in the lock, with the main point of interest being the interaction between the ship and the flow resulting from the jet. To understand more...

Development and implementation of moving boundary conditions in the Material Point Method

A new technique is developed in this thesis, which applies boundary conditions to moving boundaries in the Material Point Method (MPM). While MPM has been proven to be useful in slope stability, foundation and seabed ploughing modelling, the application of boundary conditions is still a challenge,<br/>because the location of the boundary is...

Sand closures: A study towards the morphology under mixing layers using laboratory experiments and a numerical model

Dams are an essential part of the Dutch flood defence works to protect the hinterland from flooding by the sea. Sand closures are the construction of closure dams with sand as the main building material. The rising and falling tide generates a current through the closure gap, which increases in strength as the gap becomes smaller. This current...