In this thesis, the identification and generation of meteotsunamis on the Southern North Sea are investigated. Although meteotsunamis are well known in other areas, hardly any research has been done on them near the Dutch Coast. Here, nine years of sea level elevation data are evaluated using the classic approach and a subsequent wavelet analysis to identify a list of potential meteotsunamis. Six of those events have been selected, for which the atmospheric conditions were simulated by WRF. To definitively classify them as meteotsunamis, a pressure jump and atmospheric front responsible for the generation are identified. The six events are characterized by computation of their angle of incidence, wave period, and wave height, and are checked for the probability of Proudman resonance. The six selected events were all linked to a pressure jump and an atmospheric front, and thus classified as meteotsunamis. Two events propagated from the North-West and the other four from the South through the English Channel. The wave periods varied between 10 and 25 minutes, and the wave heights varied around 0.20 meters, with a maximum wave height of 0.63 meters. Three events were linked to a front propagating overseas, all of which had a high probability that Proudman resonance contributed to their amplification. These results form a foundation for future research on meteotsunamis on the Southern North Sea.

Van Sickle Island, located in the Suisun Marsh in the San Francisco Bay Area, has experienced multiple levee breaches in the past. Due to the large social and economic implications of flooding, questions have arisen about whether the current management of the island is still feasible. This project, therefore, aimed to find the most financially favorable management plan for the upcoming 50 years. First, an understanding of the system was obtained through a site investigation, a multivariate analysis, and a hydrodynamic model. It was concluded that discharge, tide, air pressure, and wind setup all contribute to the water level. These variables were then used as input for a 1-dimensional hydrodynamical model, which quantifies their effect on the water level. Subsequently, four management plans were considered: status quo, raising the levees, conversion into an estuarine wetland, and abandoning the island. To allow for comparison between these management plans, a cost-benefit analysis and a net present value calculation were performed for every plan. One of the major contributors to the costs is risk. Risk is defined as the product of the probability of failure and the consequence of that failure. The failure mechanism assessed is overflow, as this is the most relevant one. To quantify this failure probability, a statistical model was developed. This model includes an extreme value analysis and an event tree. Due to large uncertainties in the behavior of both the levee and the water level over time, the original 50-year lifetime of the management plan was deemed too ambitious. Therefore the lifetime was reduced to 10 years. The conclusion of the cost-benefit analysis and the net present value was to convert Van Sickle Island into an estuarine wetland. This is because it was the only management plan that was profitable after 10 years. The net present value was found to be equal to $14,924,048.