33
3
Storm Impact on the
Coastal Geomorphology
and Current Field
by Wave Field
Image Sequences
Stylianos Flampouris, Joerg Seemann,
Christian Senet, and Friedwart Ziemer
CONTENTS
3.1 Introduction ....................................................................................................34
3.1.1 Area of Investigation .......................................................................... 35
3.1.2 Experimental Setup ............................................................................ 36
3.1.2.1 Radar Data ........................................................................... 37
3.1.2.2 Meteorological and Oceanographic Measurements............. 37
3.1.2.3 Multibeam Echosounder Data ............................................. 37
3.2 Literature Review ........................................................................................... 38
3.2.1 Imaging the Seabed Topography by Roughness Modulation ............. 38
3.2.2 Averaged Radar Image Sequence ....................................................... 39
3.2.3 Inversion of the Wave Field Propagation ............................................ 39
3.3 Dispersive Surface Classificator ..................................................................... 41
3.3.1 Signal Processing Algorithm .............................................................. 43
3.3.1.1 Polar to Cartesian ................................................................. 43
3.3.1.2 Directional-Frequency Decomposition ................................ 43
3.3.1.3 Wave Number and Dispersion Regression ........................... 43
3.3.2 Applicable Sea Wave Models ............................................................. 43
3.4 Postprocessing Procedures .............................................................................44
3.5 Bathymetric and Current Field Monitoring during a Storm: The Sylt
Island Case Study ........................................................................................... 47
3.5.1 Meteorological and Oceanographic Conditions ................................. 47
3.5.2 Storm Impact on the Bathymetry ....................................................... 49
3.5.3 Current Field Monitoring during the Storm ....................................... 51
3
Storm Impact on the
Coastal Geomorphology
and Current Field
by Wave Field
Image Sequences
Stylianos Flampouris, Joerg Seemann,
Christian Senet, and Friedwart Ziemer
CONTENTS
3.1 Introduction ....................................................................................................34
3.1.1 Area of Investigation .......................................................................... 35
3.1.2 Experimental Setup ............................................................................ 36
3.1.2.1 Radar Data ........................................................................... 37
3.1.2.2 Meteorological and Oceanographic Measurements............. 37
3.1.2.3 Multibeam Echosounder Data ............................................. 37
3.2 Literature Review ........................................................................................... 38
3.2.1 Imaging the Seabed Topography by Roughness Modulation ............. 38
3.2.2 Averaged Radar Image Sequence ....................................................... 39
3.2.3 Inversion of the Wave Field Propagation ............................................ 39
3.3 Dispersive Surface Classificator ..................................................................... 41
3.3.1 Signal Processing Algorithm .............................................................. 43
3.3.1.1 Polar to Cartesian ................................................................. 43
3.3.1.2 Directional-Frequency Decomposition ................................ 43
3.3.1.3 Wave Number and Dispersion Regression ........................... 43
3.3.2 Applicable Sea Wave Models ............................................................. 43
3.4 Postprocessing Procedures .............................................................................44
3.5 Bathymetric and Current Field Monitoring during a Storm: The Sylt
Island Case Study ........................................................................................... 47
3.5.1 Meteorological and Oceanographic Conditions ................................. 47
3.5.2 Storm Impact on the Bathymetry ....................................................... 49
3.5.3 Current Field Monitoring during the Storm ....................................... 51