Master of Science thesis “Bypass - Itajaí-Açu”

The city of Itajaí is located in the province of Santa Catharina in Brazil. The people of Itajaí have been coping with flood risk for the past decades. During normal conditions the Itajaí-Açu River is a rather calm river that is used for navigation and the harbour area. Recovering from the past two floods in 2008 and 2011 have cost more than...

Improving the predictive equation for dispersion in estuaries

Dispersion is often hard to incorporate in analytical salt intrusion models. The analytical models of Savenije (1986) and Kuijper & Van Rijn (2011) are quite similar and use a predictive equation for the dispersion in the estuary mouth. The biggest difference between the two models is the Van der Burgh K for which Kuijper and Van Rijn stated...

Adaptation of the Hollandsche IJssel storm surge barrier

The storm surge barrier and levees located in the Hollandsche IJssel do not fulfill the current safety standards according to the third nationwide safety assessment. The non-closure probability of the storm surge barrier is too high and the inner slope stability of the levees is too low. Besides the problems regarding the flooding safety also...

Mixing of salinity by ship traffic in canals

Salt intrusion poses a threat to the fresh water supply function of inland waterways. How far inland salt intrusion reaches is dependent on a balance of buoyancy forcing, water depth, discharge of the canal and the amount of mixing. Wind, bottom roughness, and sailing ships contribute to mixing. Currently, little is known about the contribution...

Salt intrusion in the river Maputo, Mozambique; field survey and one-dimensional modelling

The aim of the study was to give an indication of the accuracy and applicability of one-dimensional salt intrusion models in estuaries in Mozambique. Attention is mainly centered on tidally averaged modeis, although some preliminary testing of a real- time model is included as weIl. Testing of the models is done with data, obtained from a field...

Dispersion and dynamically one-dimensional modeling of salt transport in estuaries

An estuary forms the transition between the ocean/sea and a river. Within its boundaries salt and fresh water mix. Fresh water intake points may be located within the reach of salt intrusion. In order to justify political and managerial decisions it is thus necessary to understand and be able to predict the process of salt intrusion in estuaries...

On the effect of tidal variations of turbulent mixing on flow and salt transport in estuaries

The intrusion of sea water into estuaries creates a complex flow that results from the density difference between fresh river run-off and salty sea water. In combination with other processes, such as tides, these complex flows are of interest because they affect the transport of e.g. salt, sediments and nutrients in water, which determine the...