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Validation of Coastal Wind and Wave Fields by High Resolution Satellite Data

Lehner, Susanne und Pleskachevsky, Andrey und Bruck, Miguel und Li, Xiao-Ming und Brusch, Stephan (2011) Validation of Coastal Wind and Wave Fields by High Resolution Satellite Data. In: Proceedings of 12th international workshop on wave hindcasting and forecasting. 12th International Workshop on Wave Hindcasting and Forecasting, 30. Okt. - 4. Nov. 2011, Kohala Coast,Big Island, Hawaii .

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Kurzfassung

Methods to derive wind speed and the sea state from Synthetic Aperture Radar (SAR) satellite data are presented and applied for use in high resolution numerical modelling for coastal application. The new radar satellite TerraSAR-X (TS-X) images the sea surface with a high resolution up to 1m. So not only the wind field and integrated sea state parameters but also individual ocean waves with wavelengths down to 30m are detectable. Two-dimensional information of the ocean surface retrieved using TS-X data is validated for different oceanographic applications: derivation of fine resolved wind fields (XMOD algorithm) and integrated sea state parameters (XWAVE algorithm). The algorithms are capable to take into account fine-scale effects in coastal areas. he wind and sea state information retrieved from SAR data are applied as an input for a wave numerical spectral model (wind forcing and boundary condition of sea state) running at fine spatial horizontal resolution of 100m. The results are compared to collocated buoy measurements. The sea state simulated by increased and decreased wind speed and comparison against waves simulated using original TS-X derived wind shows sensitivity of waves on local wind variation and thus the importance of local wind effects on wave behaviour in coastal areas. Examples for the German Bight, North Sea are shown. The TS-X satellite scenes render well developed ocean wave patterns of well developed swell at the sea surface. Refraction of individual long swell waves at a water depth shallower than about 70m is caused by the influence of underwater topography in coastal areas which is imaged on the radar scenes. A technique was developed for tracking of wave rays depending on changing of swell wavelength and direction. We estimate the wave energy flux along the wave tracks from deep water to the coastal line based on SAR information: wave height and wavelength are derived from TS-X data.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Validation of Coastal Wind and Wave Fields by High Resolution Satellite Data
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Lehner, SusanneNICHT SPEZIFIZIERT
Pleskachevsky, AndreyNICHT SPEZIFIZIERT
Bruck, MiguelNICHT SPEZIFIZIERT
Li, Xiao-MingNICHT SPEZIFIZIERT
Brusch, StephanNICHT SPEZIFIZIERT
Datum:31 Oktober 2011
Erschienen in:Proceedings of 12th international workshop on wave hindcasting and forecasting
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
NICHT SPEZIFIZIERTUniversity Hawaii
Status:veröffentlicht
Stichwörter:remote sensing, SAR, TerraSAR-X, wind, waves, modeling
Veranstaltungstitel:12th International Workshop on Wave Hindcasting and Forecasting
Veranstaltungsort:Kohala Coast,Big Island, Hawaii
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:30. Okt. - 4. Nov. 2011
Veranstalter :University of Hawaii
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Gewässerfernerkundung
Hinterlegt von: Bärbel Bolowski
Hinterlegt am:06 Dez 2011 07:13
Letzte Änderung:06 Dez 2011 07:13

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