Print Email Facebook Twitter Semi-Automated Monitoring of a Mega-Scale Beach Nourishment Using High-Resolution TerraSAR-X Satellite Data Title Semi-Automated Monitoring of a Mega-Scale Beach Nourishment Using High-Resolution TerraSAR-X Satellite Data Author Vandebroek, Elena (Deltares) Lindenbergh, R.C. (TU Delft Optical and Laser Remote Sensing) van Leijen, F.J. (TU Delft Mathematical Geodesy and Positioning) de Schipper, M.A. (TU Delft Coastal Engineering; Shore Monitoring & Research) de Vries, S. (TU Delft Coastal Engineering) Hanssen, R.F. (TU Delft Mathematical Geodesy and Positioning) Date 2017 Abstract This paper presents a semi-automated approach to detecting coastal shoreline change with high spatial- and temporal-resolution using X-band synthetic aperture radar (SAR) data. The method was applied at the Sand Motor, a “mega-scale” beach nourishment project in the Netherlands. Natural processes, like waves, wind, and tides, gradually distribute the highly concentrated sand to adjacent beaches. Currently, various in-situ techniques are used to monitor the Sand Motor on a monthly basis. Meanwhile, the TerraSAR-X satellite collects two high-resolution (3 × 3 m), cloud-penetrating SAR images every 11 days. This study investigates whether shorelines detected in TerraSAR-X imagery are accurate enough to monitor the shoreline dynamics of a project like the Sand Motor. The study proposes and implements a semi-automated workflow to extract shorelines from all 182 available TerraSAR-X images acquired between 2011 and 2014. The shorelines are validated using bi-monthly RTK-GPS topographic surveys and nearby wave and tide measurements. A valid shoreline could be extracted from 54% of the images. The horizontal accuracy of these shorelines is approximately 50 m, which is sufficient to assess the larger scale shoreline dynamics of the Sand Motor. The accuracy is affected strongly by sea state and partly by acquisition geometry. We conclude that using frequent, high-resolution TerraSAR-X imagery is a valid option for assessing coastal dynamics on the order of tens of meters at approximately monthly intervals Subject high-resolution SAR imageryTerraSAR-Xshorelinebeach nourishmentSand Motorcoastal dynamicsOA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:58f55d2f-22fb-47e1-817b-3167c5a06de6 DOI https://doi.org/10.3390/rs9070653 ISSN 2072-4292 Source Remote Sensing, 9 (7) Part of collection Institutional Repository Document type journal article Rights © 2017 Elena Vandebroek, R.C. Lindenbergh, F.J. van Leijen, M.A. de Schipper, S. de Vries, R.F. Hanssen Files PDF remotesensing_09_00653_v2.pdf 1.75 MB Close viewer /islandora/object/uuid:58f55d2f-22fb-47e1-817b-3167c5a06de6/datastream/OBJ/view