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Summary of Proposal HYD2799

TitleDikes under pressure – Technical and ecological Vulnerability and Resilience of dike landscapes
Investigator Marzahn, Philip - LMU Munich, Department of Geography
Team Member
Prof. Ludwig, Ralf - Ludwig-Maximilians Universität München, Department für Geographie
Dr. Martinis, Sandro - Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Deutsches Fernerkundungsdatenzentrum - Georisiken und Zivile Sicherheit
M.Sc. Tsygankaya, Viktoriya - Ludwig-Maximilians Universität München, Department für Geographie
M.Sc. Seidel, Moritz - Ludwig-Maximilians Universität München, Department für Geographie
Prof. Dr. Strunz, Günter - DLR, EOC
SummaryEarth observation provides an increasingly stronger contribution to disaster prevention and crisis management. This helps both decision makers and emergency services in place. By the setup of the sentinel fleet, as well as the extension of national missions, the number of available satellite sensors and the overflight frequency over risk- and disaster areas is increasing. Thus a higher spatial and temporal coverage is given for the derivation of crisis information. It isexpected that in future, user requirements can be better served and that an improved operational use of satellite systems with optimized products or services will be achieved. For this purpose it is essential to explore the possibilities of new sensors as well as the synergistic benefits of different systems in order to fall back in the case of crisis situations on a profound basis for decision making. By „Dikes under pressure“ a profound basis for decision making will be created for the analysis of the data from Sentinel-1/2 and from german national missions (TerraSAR-X, RapidEye), allowing an optimized and synergistic use of these systems to monitor the technical and ecological vulnerability and resilience of dike landscapes. The focus is on the investigation of the stability of dikes and the dike surrounding area in presence of natural processes such as floods and tides, as well as anthropogenic changes using Synthetic Aperture Radar(SAR) interferometry. In the process possible vertical and horizontal movements/changes in the dike body and dike surrounding areas are observed and therefore an efficient method for the monitoring of dikes will be developed. In the project methods based on remote sensing for the detection of possible land use changes as a result of fairwaydeepening in important river basins, along with a potential subsidence of the dike surrounding areas and a possible salt intrusion in the groundwater body will be developed. During prolonged flood events, the horizontal pressure of the water causes an increased risk potential onthe dike body. In this project by the synergistic use of SAR and optical sensors, existing algorithms will be further developed to detect open waterbodies as well as underflooded vegetation/waterbodies and dike percolations. Their size and volume will be used as an indicator for the condition of a dyke and also for the analysis and validation of deformations identified by means of SAR interferometry.

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