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; Schückel, Ulrike; Son, Chang Soo; Jung, Richard; Bartholomä, Alexander; Ehlers, Manfred; Kröncke, Ingrid; Lehner, Susanne; Farke, Hubert

doi:10.1007/s00367-016-0478-y

Cited by 6 publications

(9 citation statements)

References 40 publications

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“…To extract relevant markers from the SAR data, bedform positions were determined by detection of the water-covered troughs according to the method proposed by Ref. [19] which is based on textural analysis combined with an unsupervised classification: For comparison with the complete set of TerraSAR-X data, the images were re-sampled at their highest common resolution, a pixel size of 1.25 m. Speckle reduction was performed by edge-preserving Frost and Median filtering and followed by a textural analysis calculating Gray Level Co-occurrence Matrix (GLCM) statistical parameters (variance, homogeneity, and mean) according to Ref. [29].…”

Section: Digital Image Analysismentioning

confidence: 99%

“…Garmin's GPSmap 62s was used for the GPS measurements, the photos were taken with cameras with GPS functionality. Additionally, the bedforms in the upper flats of Norderney were validated by high-precision height measurements recorded by Real Time Kinematic Differential GPS (RTK-DGPS) with a Leica Differential-GPS SR530 and AT 502 antenna type, see [19,20]. Furthermore, Remote Sens.…”

Section: Ground Truth Monitoring and Environmental Datamentioning

confidence: 99%

“…Environmental background information included water level data from the gauges at Borkum Fischerbalje, Norderney Riffgat, Spiekeroog, Wangerooge West and Wangerooge East (source: Federal Waterways and Shipping Administration WSV, provided by Federal Institute for Hydrology BfG), as well as wind speed and direction data from the weather stations on Borkum, Norderney and Spiekeroog (source: German Weather Service DWD). Differential GPS (RTK-DGPS) with a Leica Differential-GPS SR530 and AT 502 antenna type, see [19,20]. Furthermore, data from the annual mussel monitoring program of the National Park authority in Lower Saxony (NLPV) were used which are obtained by interpretation of aerial photographs.…”

Section: Ground Truth Monitoring and Environmental Datamentioning

confidence: 99%

“…For this purpose, the water-covered bedform troughs were extracted from the TerraSAR-X images using an automated method developed by Ref. [19].…”

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confidence: 99%

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Remote Sensing Intertidal Flats with TerraSAR-X. A SAR Perspective of the Structural Elements of a Tidal Basin for Monitoring the Wadden Sea

et al. 2018

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Spatial distribution and dynamics of intertidal habitats are integral elements of the Wadden Sea ecosystem, essential for the preservation of ecosystem functions and interlocked with geomorphological processes. Protection and monitoring of the Wadden Sea is mandatory and remote sensing is required to survey the extensive, often inaccessible tidal area. Mainly airborne techniques are carried out for decades. High-resolution satellite-borne sensors now enable new possibilities with satellite synthetic aperture radar (SAR) offering high availability of acquisitions during low water time due to independence from daylight and cloud cover. More than 100 TerraSAR-X images from 2009 to 2016 were used to examine the reproduction of intertidal habitats and macrostructures from the flats south of the island of Norderney and comparative areas in the Lower Saxony Wadden Sea. As a non-specific, generic approach to distinguish various and variable surface types continuously influenced by tidal dynamics, visual analysis was chosen which was supported by extensive in situ data. This technically unsophisticated access enabled us to identify mussel beds, fields of shell-detritus, gully structures, mud fields, and bedforms, the latter detected in the upper flats of every East Frisian island. Based on the high frequency of TerraSAR-X recordings for the Norderney area, a bedform shift was observed in a time-series from 2009 to 2015. For the same period, the development of a mud field with an adjoining depression was traced. Beside seasonal variations of the mud field, the formation of a mussel bed settling in the depression was imaged over the years. This study exemplifies the relevance of TerraSAR-X imagery for Wadden Sea remote sensing. Further development of classification methods for current SAR data together with open access availability should contribute to large-scale surveys of intertidal surface structures of geomorphic or biogenic origin and improve monitoring and long-term ecological research in the Wadden Sea and related tidal areas.

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Section: Digital Image Analysismentioning

confidence: 99%

Section: Ground Truth Monitoring and Environmental Datamentioning

confidence: 99%

Section: Ground Truth Monitoring and Environmental Datamentioning

confidence: 99%

“…For this purpose, the water-covered bedform troughs were extracted from the TerraSAR-X images using an automated method developed by Ref. [19].…”

mentioning

confidence: 99%

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Remote Sensing Intertidal Flats with TerraSAR-X. A SAR Perspective of the Structural Elements of a Tidal Basin for Monitoring the Wadden Sea

et al. 2018

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“…Adolph et al (2016b) show how bedform structures on tidal flats can be detected. Further investigations of these structures reveal the local distribution of benthic macrofauna communities.…”

Section: Assessment Of Temporal Variabilitymentioning

confidence: 99%

Monitoring concepts for an evaluation of marine environmental states in the German Bight

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2017

Geo-Mar Lett

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Integration of TerraSAR-X, RapidEye and airborne lidar for remote sensing of intertidal bedforms on the upper flats of Norderney (German Wadden Sea)

et al. 2016

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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

Cited by 6 publications

References 40 publications

Remote Sensing Intertidal Flats with TerraSAR-X. A SAR Perspective of the Structural Elements of a Tidal Basin for Monitoring the Wadden Sea

Remote Sensing Intertidal Flats with TerraSAR-X. A SAR Perspective of the Structural Elements of a Tidal Basin for Monitoring the Wadden Sea

Monitoring concepts for an evaluation of marine environmental states in the German Bight

Integration of TerraSAR-X, RapidEye and airborne lidar for remote sensing of intertidal bedforms on the upper flats of Norderney (German Wadden Sea)

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