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Monitoring spatiotemporal trends in intertidal bedforms of the German Wadden Sea in 2009–2015 with TerraSAR-X, including links with sediments and benthic macrofauna

Adolph, Winny and Schückel, Ulrike and Son, Chang Soo and Jung, Richard and Bartholomä, Alexander and Ehlers, Manfred and Kröncke, Ingrid and Lehner, Susanne and Farke, Hubert (2017) Monitoring spatiotemporal trends in intertidal bedforms of the German Wadden Sea in 2009–2015 with TerraSAR-X, including links with sediments and benthic macrofauna. Geo-Marine Letters, 37 (2), pp. 79-91. Springer. DOI: 10.1007/s00367-016-0478-y ISSN 0276-0460

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Official URL: http://www.readcube.com/articles/10.1007/s00367-016-0478-y?author_access_token=AZL5-VjeQ8DlWgHeI1SID_e4RwlQNchNByi7wbcMAY4Jcv3pRVgodEuIOpJXVsur_6VYJfPGb3MNe4HCGp4X5DoB69peU0ZvNojpvvFnujM6bJ1UKKBhiutvuI8JK37M5xIGIC18DU_SXnbUrxV4NQ%3D%3D

Abstract

Satellite synthetic aperture radar (SAR) holds a high potential for remote sensing in intertidal areas. Geomorphic structures of the sediment surface generating patterns of water cover contrasting with exposed sediment surfaces can clearly be detected. This study explores intertidal bedforms on the upper flats bordering the island of Norderney in the German Wadden Sea using TerraSAR-X imagery from 2009 to 2015. Such bedforms are common in the Wadden Sea, forming crests alternating with water-covered troughs oriented in a north-easterly direction. In the western Norderney area, the crest-to-crest distance ranges from 50–130 m, and bedform length can reach 500 m. Maximum height differences between crests and troughs are 20 cm. A simple method is developed to extract the water-covered troughs from TerraSAR-X images for spatiotemporal analysis of bedform positions in a GIS. It is earmarked by unsupervised ISODATA classification of textural parameters, contrasting with various algorithm-based methods pursued in earlier studies of waterline detection. The high-frequency TerraSAR-X data reveal novel evidence of a bedform shift in an easterly direction during the study period. Height profiles measured with RTK-DGPS along defined transects support the findings from TerraSAR-X data. First investigations to characterise sediments and macrofauna show that benthic macrofauna community structure differs significantly between crests and troughs, comprising mainly fine sands. Evidently, bedform formation has implications for benthic faunal diversity in back-barrier settings of the Wadden Sea. SAR remote sensing provides pivotal data on bedform dynamics.

Item URL in elib:https://elib.dlr.de/106668/
Document Type:Article
Additional Information:corresponding author Winny Adolph: mail@winny-adolph.de, open access article, published online --> PDF available
Title:Monitoring spatiotemporal trends in intertidal bedforms of the German Wadden Sea in 2009–2015 with TerraSAR-X, including links with sediments and benthic macrofauna
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Adolph, WinnyDLR-IMF, Wadden Sea National Park Authority of Lower Saxony / Institute for Geoinformatics and Remote Sensing (IGF)https://orcid.org/0000-0003-1541-8269
Schückel, UlrikeSchleswig-Holstein Agency for Coastal Defence, National Park and Marine Conservation, National Park Authority, Schlossgarten 1, 25832 Tönning, Germany / Senckenberg am Meer, Marine Research Department, Südstrand 40, 26382 Wilhelmshaven, GermanyUNSPECIFIED
Son, Chang SooFaculty of Earth System & Environmental Sciences, Chonnam National University, Republic of KoreaUNSPECIFIED
Jung, RichardInstitute for Geoinformatics and Remote Sensing (IGF), University of Osnabrück, Wachsbleiche 27, 49090 Osnabrück, GermanyUNSPECIFIED
Bartholomä, AlexanderSenckenberg am Meer, Marine Research Department, Südstrand 40, 26382 Wilhelmshaven, GermanyUNSPECIFIED
Ehlers, ManfredInstitute for Geoinformatics and Remote Sensing (IGF), University of Osnabrück, Wachsbleiche 27, 49090 Osnabrück, GermanyUNSPECIFIED
Kröncke, IngridSenckenberg am Meer, Marine Research Department, Südstrand 40, 26382 Wilhelmshaven, GermanyUNSPECIFIED
Lehner, SusanneSusanne.Lehner (at) dlr.deUNSPECIFIED
Farke, HubertWadden Sea National Park Authority of Lower Saxony (NLPV), Virchowstr. 1, 26382 Wilhelmshaven, GermanyUNSPECIFIED
Date:2017
Journal or Publication Title:Geo-Marine Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:37
DOI :10.1007/s00367-016-0478-y
Page Range:pp. 79-91
Publisher:Springer
Series Name:WIMO—Scientific monitoring concepts for the German Bight
ISSN:0276-0460
Status:Published
Keywords:SAR, German Wadden Sea, Norderney, TerraSAR-X, intertidal bedforms, sediment, remote sensing, environmental monitoring
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 - SAR-Methodology
Location: Bremen , Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By: Kaps, Ruth
Deposited On:23 Nov 2016 13:44
Last Modified:10 Jan 2018 12:16

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