Science Service System

Summary of Proposal GEO0258

TitleMOMO - MOnitoring of El Nino forced MOrphodynamics in the coastal desert of Peru
Investigator Baade, Jussi - Friedrich-Schiller-Universität, Physical Geography
Team Members
Ing. M. Sc. Barrena, Victor - Universidad Nacional Agraria La Molina, Laboratorio de Teledeteccion Aplicada y SIG
M. Sc. Huerta, Patricia - Universidad Nacional Agraria La Molina, Laboratorio de Teledeteccion Aplicada y SIG
Prof. Dr. Schmullius, Christiane - Friedrich-Schiller-Universität, Geoinformatics and Remote Sensing
SummaryThe proposing team is aware of possible TerraSAR-X InSAR restrictions for this call. Since the methodology is however interlinked with backscatter analysis only, this proposal fulfils the call and the authors wish to start as early as possible with the preparations. Funding is ensured through a DFG-project. Objectives: 1) To map the extent of flooding during annual flooding and an El Nino event in the arid coastal regions of Peru and to map the geomorphologic forcing of such a flood event on the alluvial plain. This is of high relevance to understand the environmental impact on archeological Nazca settlements in the river plains in Peru. 2) To topographically map the dune field of Pampas Blancas to establish a base map for research on aeolian morphodynamics. Method: 1) Flood mapping is performed with high geometric resolution as close as possible in time to an El Nino event (between January until April). Mapping is based on the backscatter difference between dry, moist and flooded unvegetated surfaces. Geomorphic forcing on the gravel river bed of the alluvial plain is investigated by repeat-pass interferfometry of InSAR data pairs before and after the El Nino flood during the dry season in September and October. 2) Topographic mapping of the Pampas Blancas dune field based on X-band InSAR data pairs during the months Januar until April, when short moist periods enable the mapping of the dune field. Data Requirements The date of acquisition is crucial, since the information retrieval is based on 1) for the flood extent on annual and an expected El Nino flood event, and 2) for the dune fields on short periods of surface moisture to map topography. Coordination with the local experts is therefore important. The geomorphic forcing can be mapped with InSAR data pairs during the dry September and October months, since the river’s gravel bed will result in sufficiently strong backscatter to calculate the interferogram. 2007, 2008 and 2009 1) Rio Grande de Nazca (covered by 1 Spotlight scene): January until April – 4 scenes 11 days appart to be coordinated with rain event, September/October – one 11-day repeat-pass pair. Sum = 6 scenes x 3 years = 18. 2) Pampas Blancas Dune Field (covered by 1 Spotlight scene): January until April – one 11-day repeat-pass pairs for ascending and descending orbits with low incidence angles to cover all geometries. Sum = 4 scenes x 3 years = 12. All data acquisitions have to be in Spotlight Mode for high geometric accuracy. Co-polarisation if preferred. Deliverables 1)Map of the El Nino flood extent of the Rio Grande de Nazca valley. 2)Topographic difference map of the alluvial river valley explaining the geomorphic forcing of an El Nino event on the landscape. 3)Topographic base map of the Pampas Blancas dune field.

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