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You searched for subject:(SWAN Mud). Showing records 1 – 2 of 2 total matches.

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Delft University of Technology

1. Borsje, Ruben (author). Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia.

Degree: 2019, Delft University of Technology

Demak is a regency within the province of Central Java, Indonesia, with a mud-mangrove coast bordering the Java Sea. The region is facing a rapid retreat of the coastline, threatening the livelihood of a large part of the population. The main cause of the erosion is the deforestation of the green belt of mangroves. This has disturbed the delicate sediment balance in the area drastically. This MSc thesis was carried out within BioManCO. This is a project of Delft University of Technology and Universitas Diponegoro and aims to develop a bio-morphodynamic model for mangrove-mud coasts. This will eventually be used to identify the conditions under which autonomous reforestation of a sustainable mangrove green belt will take place, restoring the natural coastal protection. Semi-permeable dams are already being implemented to restore the sediment balance in the area. In this approach, however, the existence of a fluid mud layer is neglected. The observation of relatively steep slopes of the interface between mud and water indicates potential mud transport within the mud layer. Such a transport would contribute to the shoreward flux of sediment and thus to the restoration of the coastal profile. If a hybrid dam is implemented, it will block the flow of sediment and might therefore defy its own purpose; attenuating flow and waves in order to capture sediment and restore the eroded coastal profile. The objective of this thesis is to assess wave damping as a driving mechanism for set-up of the fluid mud layer at the coast of Demak and to identify under what conditions such a set-up can exist. Significant attenuation of waves can be achieved by viscous dissipation of wave energy in the mud layer. The set-up of the fluid mud interface is hypothesised to be balancing the wave force resulting from the reduction of wave energy in shoreward direction. To gain insight in the damping of waves and, more generally, in the dynamics of the coastal system of Demak, a field campaign has been carried out. Based on these measurements a SWAN-Mud model has been set up and has been coupled to an idealised model that calculates the equilibrium slope based on modelled wave-damping. The field observations show that the interface level is indeed sloping upwards towards the coast. This slope, however, does not seem to change significantly during the field campaign, indicating that the occurring waves are not able to move the layer. A strong daily variation in wave height and period, dependent on the prevailing wind system, is observed. SWAN-Mud is able to reproduce these measurements convincingly, even with the simple schematisation used in this thesis. The damping of the waves is influenced by the water depth and the wave period, and to a lesser extent by the wave height. It is also strongly dependent on the thickness and viscosity of the mud layer. The use of a fluid mud module to model the dissipation of waves at the coast of Demak is proven to be necessary. The developed conceptual model assumes a balance between the wave force in the mud layer… Advisors/Committee Members: Reniers, Ad (mentor), van Maren, Bas (mentor), Winterwerp, Han (graduation committee), de Schipper, Matthieu (graduation committee), Tas, Silke (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: fluid mud; Building with Nature; mud coast; erosion; sediment transport; Wave Attenuation; wave damping; radiation stress; fieldwork; SWAN; SWAN-Mud; viscous damping; indonesia; Demak; mud; conceptual model; hybrid dam

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

APA (6th Edition):

Borsje, R. (. (2019). Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d51e770e-37ad-4c02-8cbf-c5abceaccc39

Chicago Manual of Style (16th Edition):

Borsje, Ruben (author). “Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia.” 2019. Masters Thesis, Delft University of Technology. Accessed October 20, 2020. http://resolver.tudelft.nl/uuid:d51e770e-37ad-4c02-8cbf-c5abceaccc39.

MLA Handbook (7th Edition):

Borsje, Ruben (author). “Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia.” 2019. Web. 20 Oct 2020.

Vancouver:

Borsje R(. Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2020 Oct 20]. Available from: http://resolver.tudelft.nl/uuid:d51e770e-37ad-4c02-8cbf-c5abceaccc39.

Council of Science Editors:

Borsje R(. Wave-Driven Set-Up of Fluid Mud: Demak, Indonesia. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:d51e770e-37ad-4c02-8cbf-c5abceaccc39


Delft University of Technology

2. Kranenburg, W.M. (author). Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN.

Degree: Civil Engineering and Geosciences, Hydraulic Engineering, 2008, Delft University of Technology

On numerous locations in the world mud occurs in front of the coast close to river mouths. This mud can be transported to these places in fluid state or can become fluid under certain wave conditions. Fluid mud may have a strong damping effect on surface waves. Dissipation of up to 90% of the wave energy within a few kilometers has been measured. In this study, the wave model SWAN is modified to make it possible to model the dissipation of energy during the propagation of a wave field over fluid mud. A two-layer model is used to describe the water-mud-system. The upper layer represents the water and is non-hydrostatic and non-viscous. The lower layer represents the fluid mud and is quasi-hydrostatic and viscous. Based on this schematization a complex dispersion equation is derived and compared with other dispersion equations from literature. A numerical solving procedure is formulated to solve this implicit complex dispersion equation for the wave number. When the wave number is known, information on the damping is given by the imaginary part, while the real part is associated with the wave length and the propagation velocity of energy. To compute wave damping for situations in practice, the influence of mud is incorporated in the wave model SWAN. First, the energy dissipation term consistent with the dispersion equation is derived and added as a sink term to the energy balance in SWAN. By making the mud-adjusted wave number available through the whole code, also influence of fluid mud on energy propagation is included in the model. The performance of the model for both energy dissipation and energy propagation is validated and compared to analytical solutions for some simple cases. Result The final result of this study is a modified version of SWAN which allows to model the decrease of energy during the propagation of a wave field over fluid mud. The model is ready for use in engineering applications by specialists.

Civil Engineering and Geosciences

Advisors/Committee Members: Stelling, G.S. (mentor), Winterwerp, J.C. (mentor), De Boer, G.J. (mentor), Zijlema, M. (mentor), Metrikine, A. (mentor), Cornelisse, J.M. (mentor), WL Delft Hydraulics (contributor).

Subjects/Keywords: waves; damping; SWAN; fluid mud; two-layer models

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

APA (6th Edition):

Kranenburg, W. M. (. (2008). Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7644eb5b-0ec9-4190-9f72-ccd7b50cfc47

Chicago Manual of Style (16th Edition):

Kranenburg, W M (author). “Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN.” 2008. Masters Thesis, Delft University of Technology. Accessed October 20, 2020. http://resolver.tudelft.nl/uuid:7644eb5b-0ec9-4190-9f72-ccd7b50cfc47.

MLA Handbook (7th Edition):

Kranenburg, W M (author). “Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN.” 2008. Web. 20 Oct 2020.

Vancouver:

Kranenburg WM(. Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN. [Internet] [Masters thesis]. Delft University of Technology; 2008. [cited 2020 Oct 20]. Available from: http://resolver.tudelft.nl/uuid:7644eb5b-0ec9-4190-9f72-ccd7b50cfc47.

Council of Science Editors:

Kranenburg WM(. Modelling wave damping by fluid mud: Derivation of a dispersion equation and an energy dissipation term and implementation into SWAN. [Masters Thesis]. Delft University of Technology; 2008. Available from: http://resolver.tudelft.nl/uuid:7644eb5b-0ec9-4190-9f72-ccd7b50cfc47

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