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Satellite-based radar measurements for validation of high-resolution sea state forecast models in German Bight

Pleskachevsky, Andrey and Lehner, Susanne and Hoffmann, Peter and Kieser, Jens and Bruns, Thomas and Lindenthal, Anja and Janssen, Frank and Behrens, Arno (2015) Satellite-based radar measurements for validation of high-resolution sea state forecast models in German Bight. In: Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-7 (W3), pp. 983-990. Copernicus Publications. 36th International Symposium on Remote Sensing of Environment (ISRSE), 11.-15. Mai 2015, Berlin, Germany. DOI: 10.5194/isprsarchives-XL-7-W3-983-2015

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Official URL: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/983/2015/isprsarchives-XL-7-W3-983-2015.pdf

Abstract

The estimation of marine and meteorological parameters is an important task for operational oceanographic services. Remote sensing Synthetic Aperture Radar (SAR) data from TerraSAR-X/Tandem-X satellites have been used for validation and verification of new developed coastal forecast models. In comparison to in-situ buoy measurements at a single location allows remote sensing to cover large areas and to estimate the spatial distribution of investigated characteristics. Methods to derive wind speed and sea state using simple empirical models from high-resolution SAR data have been developed by DLR especially for coastal applications: a new nonlinear wind algorithm XMOD-2 and new empirical model function XWAVE-2 for obtaining significant wave height from X-band data. Both algorithms are capable of taking into account finescale effects in coastal areas. In order to improve forecast accuracy in coastal area a new high-resolution Coastal Wave Model (CWAM) for the German Bight and the western Baltic Sea has been developed by the German Meteorological Service (DWD) and the German Maritime and Hydrographic Agency (BSH) with resolution of ~900m and more accurate mapping of coastlines (1) and coupled to a irculation model (2). Uncertainties are present when dealing in coastal areas: wind input implying well-timed atmospheric front propagation and physical interaction-processes in shallow water caused by interplay between waves, currents and bottom become important. Due to currents and bottom influence the waves refract, dump, become steeper and break. The lost wave energy dissipates and transfers into turbulence and acceleration of flow currents (radiation stress). Sea state estimated from series of TerraSAR-X images cover strips with length of ~200km and width of 30km over German Bight from East-Frisian Islands to Danish coast. The acquired data with more than 50 images were used for model validations. The comparisons show a number of local variations due to variety in bathymetry and wind fronts.

Item URL in elib:https://elib.dlr.de/95411/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Link: Abstract & Conference Paper (PDF, 2236 KB)
Title:Satellite-based radar measurements for validation of high-resolution sea state forecast models in German Bight
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pleskachevsky, AndreyAndrey.Pleskachevsky (at) dlr.deUNSPECIFIED
Lehner, SusanneSusanne.Lehner (at) dlr.deUNSPECIFIED
Hoffmann, PeterPeter.Hoffmann (at) dwd.deUNSPECIFIED
Kieser, JensJens.Kieser (at) dwd.deUNSPECIFIED
Bruns, ThomasThomas.Bruns (at) dwd.deUNSPECIFIED
Lindenthal, AnjaAnja.Lindenthal (at) bsh.deUNSPECIFIED
Janssen, FrankFrank.Janssen (at) bsh.deUNSPECIFIED
Behrens, ArnoArno.Behrens (at) hzg.deUNSPECIFIED
Date:2015
Journal or Publication Title:Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:XL-7
DOI :10.5194/isprsarchives-XL-7-W3-983-2015
Page Range:pp. 983-990
Publisher:Copernicus Publications
Status:Published
Keywords:Ocean waves, coastal processes, modeling, high resolution, remote sensing, radar satellites
Event Title:36th International Symposium on Remote Sensing of Environment (ISRSE)
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:11.-15. Mai 2015
Organizer:International Society for Photogrammetry and Remote Sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Bremen , Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Kaps, Ruth
Deposited On:26 Feb 2015 11:08
Last Modified:30 Nov 2015 17:58

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