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You searched for +publisher:"Delft University of Technology" +contributor:("Reedijk, B."). Showing records 1 – 3 of 3 total matches.

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Delft University of Technology

1. Schoolderman, J.E. Generating electricity from waves at a breakwater in a moderate wave climate:.

Degree: 2009, Delft University of Technology

The purpose of this thesis was to develop a preliminary concept design of a wave energy converter. The type of device designed was limited by several starting points which stipulated, among other criteria, a robust structure which can be constructed within a breakwater and can generate electricity from a fairly mild (in the order of Hs=0.5-1.5m) and regularly occurring wave climate. Integration with a caisson breakwater was selected to ensure survivability. Three concepts using the theories of wave overtopping, wave run-up, and wave pressure were evaluated. A multi-criteria analysis was performed on the three concepts. Concepts were scored based on power output, functionality in wide range of conditions, ease of construction, and theory reliability. Theory reliability was scored based on the three aforementioned criteria. The concept analysis concluded the most promising device to further investigate was the concept based on the theory of wave pressure. This device excelled in (theoretical) output having the highest peak power and wider power curves. In the concept, wave pressure is exerted on an underwater opening. This opening leads water into a pipe with a gradual constriction. This constriction increases the pressure allowing the water to be brought to an optimal level above MWL. Through a turbine the water is returned to MWL. A model was built with three different opening ratios and three separate basins open to the wave flume at the bottom. A series of tests were performed of varying wave climates and crest freeboards. During the tests the head difference was measured between the internal basins and the water elevation at the rear of the model. The holes in the bottom of the basins allowed for constant flow of water out of the basins and a calculation of flow rate based on the hydraulic head was required. This allowed for the calculation of the theoretical power generated during the tests. Additionally, the input wave power was known so the device efficiency could be calculated for each test allowing for the identification of the optimal geometry and the generation of a full-scale efficiency curve. The device was evaluated at two design locations in Panama and Japan. The wave climate, tidal influence, system headloss, and sea level rise were calculated in order to discover the power generation at each location. Revenue associated with the generation of electricity was calculated to give an indication of the device’s cost effectiveness. It was found that sea level rise has a negligible impact on efficiency if sea level rise is appropriately accounted for. The impact is in the order of 1.5% over 50 years if the rise is assumed to be 80cm over 100 years. Including sea level rise, the device has been calculated to generate an average of 16,413 and 5,766 kWh/m/yr at Panama and Japan, respectively. The report concludes that the proposed design can be constructed using existing techniques for caisson construction. However, the design must be further optimised and tested in order to become a fully feasible wave… Advisors/Committee Members: Molenaar, W.F., Zijlema, M., Reedijk, B., ten Oever, E., Vrijling, J.K..

Subjects/Keywords: wave; energy; converter; caisson; breakwater; pressure; wave energy converter; wave pressure; renewable energy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Schoolderman, J. E. (2009). Generating electricity from waves at a breakwater in a moderate wave climate:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c329464e-0911-4b30-9a87-94470f298f9c

Chicago Manual of Style (16th Edition):

Schoolderman, J E. “Generating electricity from waves at a breakwater in a moderate wave climate:.” 2009. Masters Thesis, Delft University of Technology. Accessed August 24, 2019. http://resolver.tudelft.nl/uuid:c329464e-0911-4b30-9a87-94470f298f9c.

MLA Handbook (7th Edition):

Schoolderman, J E. “Generating electricity from waves at a breakwater in a moderate wave climate:.” 2009. Web. 24 Aug 2019.

Vancouver:

Schoolderman JE. Generating electricity from waves at a breakwater in a moderate wave climate:. [Internet] [Masters thesis]. Delft University of Technology; 2009. [cited 2019 Aug 24]. Available from: http://resolver.tudelft.nl/uuid:c329464e-0911-4b30-9a87-94470f298f9c.

Council of Science Editors:

Schoolderman JE. Generating electricity from waves at a breakwater in a moderate wave climate:. [Masters Thesis]. Delft University of Technology; 2009. Available from: http://resolver.tudelft.nl/uuid:c329464e-0911-4b30-9a87-94470f298f9c

2. Lavies, H.G. Damping of wind waves in the IJmuiden breakwaters:.

Degree: 2014, Delft University of Technology

The breakwaters of IJmuiden are of a unique design; a riprap core is covered with a thick impermeable asphalt slab. During construction and after completion, slope instability caused extensive damage. Placement of a concrete cube armour layer prevented further damage to the asphalt, but proved to be unstable and required a significant amount of maintenance. Rijkswaterstaat (RWS), which is responsible for the maintenance, contracted a number of companies to investigate the strength and loading of the breakwaters. Lifting of the asphalt slab as a result of overpressure in the breakwater core was found to be the decisive failure mechanism. To determine the amount of overpressure, measurements were performed in both breakwater heads. A bigger favourable damping of wind waves was measured in the southern breakwater. Based on these measurements and other research outcomes RWS decided to change the maintenance strategy; armour units above the NPA – 2 m line will not be maintained in the future. The new strategy is based on the reasoning that the damping of wind waves reduces lifting forces and makes the weight of the armour layer redundant to prevent lifting. The mechanism(s) causing the larger damping in the southern breakwater are however unknown, this makes it hard to predict the amount of damping and therefore the magnitude of the loading of the asphalt during storm conditions. Aim of this thesis is to get insight in the stability of the asphalt slab during design storm conditions, and the necessity of an armour layer. Therefore the damping mechanism and the amount of damping during storm conditions need to be determined. Numerical modelling is performed to describe wave transmission through the breakwater and to evaluate the influence of different damping mechanisms. Most important mechanism causing additional damping is siltation of the toe structure of the southern breakwater. Along the Dutch coast the net longshore sediment transport is directed northwards. Therefore sediment passes the southern breakwater, part of the sand might settle in the toe and core of the breakwater. A sand layer with a height of 3.3 m reduces the flow of water enough to cause the measured damping. The stability of the sand during storm conditions is checked using open filter sediment transport formula. Erosion of the sand layer is expected, however the erosion is expected to be in the order of centimetres which is insignificant. The damping mechanism causing the measured damping in the southern breakwater is determined; hence loading of the asphalt slab during design storm conditions can be determined. The thickness and quality of the asphalt slab is uncertain and might vary significantly over the length of the breakwaters. In order to get insight in the quality of the asphalt two cores were drilled in 2004. One showed high quality cohesive asphalt, the other showed low quality with low cohesion. Lifting of the asphalt cannot be ruled out. The dead weight of the designed asphalt slab in combination with a partial armour layer is… Advisors/Committee Members: Uijttewaal, W.S.J., Verhagen, H.J., Van den Bos, J., Reedijk, B..

Subjects/Keywords: IJmuiden; VOF; wave damping; stability; porous flow; breakwaters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lavies, H. G. (2014). Damping of wind waves in the IJmuiden breakwaters:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e9552a63-df40-49e5-bb80-add4cfa300f7

Chicago Manual of Style (16th Edition):

Lavies, H G. “Damping of wind waves in the IJmuiden breakwaters:.” 2014. Masters Thesis, Delft University of Technology. Accessed August 24, 2019. http://resolver.tudelft.nl/uuid:e9552a63-df40-49e5-bb80-add4cfa300f7.

MLA Handbook (7th Edition):

Lavies, H G. “Damping of wind waves in the IJmuiden breakwaters:.” 2014. Web. 24 Aug 2019.

Vancouver:

Lavies HG. Damping of wind waves in the IJmuiden breakwaters:. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2019 Aug 24]. Available from: http://resolver.tudelft.nl/uuid:e9552a63-df40-49e5-bb80-add4cfa300f7.

Council of Science Editors:

Lavies HG. Damping of wind waves in the IJmuiden breakwaters:. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:e9552a63-df40-49e5-bb80-add4cfa300f7


Delft University of Technology

3. Oortman, N.J. Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:.

Degree: Faculty of Civil Engineering and Geosciences, Hydraulic Engineering, 2006, Delft University of Technology

This Masters Thesis is a pilot research project in order to investigate which parameters, other than the wave energy density spectrum, could play a role in breakwater damage on variable foreshore steepness. The research project is based up on laboratory research, were for equal wave spectra at the toe of a coastal structure significantly more damage (order of 30%) occurs to a steep foreshore in contrast to a mild slope. In order to investigate which parameters, other than the parameters included in the wave energy density spectrum could play a role in the increase in damage for a steep foreshore, an experiment was conducted. In the wave flume of the Fluid Mechanics Laboratory an experimental test set up was constructed. The test setup consisted of a breakwater build on variable foreshore steepnesses (1:30, 1:15 and 1:8). Tests were conducted with regular waves, were the wavelength and the wave steepness at the toe of the breakwater were kept constant per individual test. These tests were conducted for the three different foreshore steepnesses. Wave runs were completed for different wave heights and wave steepnesses. Each experiment was repeated in order to increase the accuracy. At the breakwater the wave velocity and acceleration was measured with zero buoyant particles. The particles were monitored with a video camera. From these video images the velocity and acceleration relative to the breakwater slope were calculated. In order to check the accuracy a reliability study of the experiment was performed. The faults in the experiment were estimated and assumed to be normal distributed. The reliability of the entire experiment was calculated for velocity and acceleration measurements. The velocities and accelerations for up-rush and down-rush were compared for equal wave conditions and different foreshore steepnesses. The experimental data shows that the velocities for up-rush and down-rush are higher for waves travelling over a steep foreshore (order of 10%). Also the obtained accelerations for both up-rush and down-rush are higher for waves travelling over a steep foreshore. When the wave force is calculated with a Morrison equation, the increase in force due to the increase in velocity for waves travelling over a steep foreshore is in the order of 20%. When considering that the acceleration is also larger in this case, this results an even larger total wave force. By linking the wave force to the level of damage, it can be explained that for equal wave spectra at the toe and for variable foreshore steepness the largest damage was measured for waves travelling over a steep foreshore. Advisors/Committee Members: Stive, M.J.F., Verhagen, H.J., Fontijn, H.L., Reedijk, B..

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Oortman, N. J. (2006). Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:5f8ed8f1-cb32-4c71-8dd3-a9ef89ef9267

Chicago Manual of Style (16th Edition):

Oortman, N J. “Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:.” 2006. Masters Thesis, Delft University of Technology. Accessed August 24, 2019. http://resolver.tudelft.nl/uuid:5f8ed8f1-cb32-4c71-8dd3-a9ef89ef9267.

MLA Handbook (7th Edition):

Oortman, N J. “Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:.” 2006. Web. 24 Aug 2019.

Vancouver:

Oortman NJ. Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:. [Internet] [Masters thesis]. Delft University of Technology; 2006. [cited 2019 Aug 24]. Available from: http://resolver.tudelft.nl/uuid:5f8ed8f1-cb32-4c71-8dd3-a9ef89ef9267.

Council of Science Editors:

Oortman NJ. Influence of foreshore steepness on wave velocity and acceleration at the breakwater interface:. [Masters Thesis]. Delft University of Technology; 2006. Available from: http://resolver.tudelft.nl/uuid:5f8ed8f1-cb32-4c71-8dd3-a9ef89ef9267

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