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Publié par | christian-albrechts-universitat_zu_kiel |
Publié le | 01 janvier 2011 |
Nombre de lectures | 13 |
Langue | English |
Poids de l'ouvrage | 12 Mo |
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Numerical modelling of the coastal processes in
Dithmarschen Bight incorporating field data
Dissertation
Zur Erlangung des Doktorgrades
der Mathematisch‐Naturwissenschaftlichen Fakultät
der Christian‐Albrechts‐Universität zu Kiel
vorgelegt von
Maryam Rahbani
Kiel
May 2011
Numerical modelling of the coastal processes in Dithmarschen Bight incorporating field data
ii
Referent: Prof. Dr. Roberto Mayerle
Korreferent: Prof. Dr. Athanasios Vafeidis
Tag der mündlichen Prüfung: 04.05.2011
Zum Druck genehmigt: 04.05.2011
iii Numerical modelling of the coastal processes in Dithmarschen Bight incorporating field data
iv
To my mother
Simin
v Numerical modelling of the coastal processes in Dithmarschen Bight incorporating field data
vi Acknowledgements
Acknowledgements
Had it not been for the support I have received in the last six years, I doubt that this thesis
would be where it is today. Over the years I have been lucky to receive the guidance and
encouragement from people who more than generous with their time and knowledge.
Firstly, I would like to thank my supervisor Prof. Dr. Roberto Mayerle, whose patience and
full attention have been a blessing. Not only was he there to answer my queries, he also
challenged me to produce my best work. I would also like to mention Prof. Dr. Athanasios
Vafeidis for being the Korreferent and reviewer of my dissertation.
My time in Germany would never have been possible without the financial support I was
given by the General Bureau of Scholarship and Overseas Affairs. More specifically a special
gratitude to the University of Hormozgan for granting me the opportunity to study abroad.
I am eternally grateful to Dr. Rangaswami Narayanan, Dr. Hossein Keshavarz and Dr. Peter
Weppen for their time, patience and influence in steering me in the right direction. Between
them they devoted a lot of time in not only reading and editing my work but also in
providing moral support. I also appreciate the support and guidance from my colleagues at
the Coastal Research Laboratory. In particular, I am grateful to Dr. Wiwin Windupranata,
Dr. Poerbandono, Dr. Karl‐Heinz Runte, Dr. Talal Etri, Simon A. van der Wulp, Joaquim
Pereira Bento Netto Jr., Katharina Róisín Niederndorfer, Jose Manuel Fernandez Jaramillo,
Jana Block, and Robert Osinski.
A special thanks to my friend, Parvaneh Karimi Massoule who did more than enough to fill
the void left from being so far from my family. She ended up being the sister that I never
had.
And finally, I would like to thank my family. First and foremost my mother Simin, who
deserves the biggest acknowledgement. If it was not for her endless encouragement and
support throughout whole my life, I doubt I would have been at this level. I cannot forget
my father, Rahim as well as my brothers, Mazyar and Sam, who never stopped believing in
me.
Maryam Rahbani
Kiel 10.05.2011
vii Numerical modelling of the coastal processes in Dithmarschen Bight incorporating field data
Abstract
The main concern of this investigation is to evaluate the use of numerical models in the
study of the sediment transport in the Dithmarschen Bight located in the German North Sea
coast. The area consists of tidal channels and tidal flats with prevailing semi‐diurnal tides
with a mean tidal range of about 3.2m. Five independently collected sets of data at different
stages of the neap‐spring tides were used for the evaluation of numerical models. The
employed models were those from the Delft3D package (Delft Hydraulics, The Netherlands)
in two and three dimensions. The investigation stages consisted of i) evaluation of the two
dimensional model results (2DH) in comparison with the field data, and ii) assessment and
comparison of the three dimensional model results (3D) with the field data and with the two model results.
Following the comparison of the 2DH model results with the field data, it was found that the
boundary conditions of the model required adjustment. The adjusted model was used to
study the effect of wind induced waves on the performance of the in providing
information on the hydrodynamics and sediment dynamics of the area. It is shown that the
effect of waves under moderate winds having velocities less than 11m/s is not significant for
this area. It is also shown that the performance of the model in providing the hydrodynamic
values in comparison with field data was good, as the mean absolute errors between these
values and the data were less than 0.2 m/s. This was not the case in regard to sediment
transport values provided by the model.
In the assessment of the performance of the 3D model, the results of the executed model
were compared with the field data and the 2DH model results. Over the depth of flow, the
uniform distribution of the current velocity and