Abstract
Wetlands are particularly sensitive environments receiving attention from the natural sciences community due to their wealth of both flora and fauna, and often considered as natural parks. In the Tablas de Daimiel (La Mancha, Central Spain), Digital Airborne Imaging Spectrometer data (DAIS 7915) have been analyzed to map geological processes on areas around the receding wetland which have never been flooded by water in the past. Sediments permanently exposed to the atmosphere dehydrate and oxide, developing different mineralogical associations arranged on planation surfaces. Such planation surfaces are key in the geological knowledge of recent climate change and landscape evolution. Progressive iron oxide/hydroxide rate and decarbonation can be spectrally followed on the Holocene sands framing the current marshy area. Such mineralogical changes are geologically registered on flat surfaces at different heights over the receding shore of the paleolake. Interacting erosion and sedimentation processes are responsible for the development of the flat morphological surfaces with increasing dryness. Maps are built for four different morphological units consisting of planation surfaces following chronologically the receding marsh during the last 2000 years before the present. Interactive spectral responses of mineralogical associations are described on the imagery, field and laboratory spectra.
Highlights
The Las Tablas de Daimiel Natural Park frames a lake at the head of the river Guadiana draining to the Atlantic, settled in the large plain of La Mancha in Central Spain
Such morphological units are planation surfaces which developed during a certain period of time
The four morphological units have been mapped using DAIS images, and their spectral properties described in terms of geological processes resulting in different mineral mixtures
Summary
The Las Tablas de Daimiel Natural Park frames a lake at the head of the river Guadiana draining to the Atlantic, settled in the large plain of La Mancha in Central Spain (fig. 1). Mapping of semi-arid iron bearing red sands around lake marshes using hyperspectral DAIS 7915 data contributing to the spectral response detected by remote sensors has gained attention among the remote sensing geological community (Pontual, 1987; Amos and Greenbaum, 1989; Riaza et al, 1995, 2000, 2001; Lyon, 1997; Younis et al, 1997). Climate-dependent saline soils, carbonate, organic matter and iron oxide surfaces have been mapped along different stages of flooding and emersion in the past 2000 years using hyperspectral data on prior work (Riaza et al, 2002). Nonconsolidated soil samples were collected at different stages of the study of the imagery lead by image processing suggestions on sedimentology and time-dependent geomorphological processes resulting in mineralogical changes. Interaction of all data and multidisciplinary analysis have been used throughout the study at every stage of progress
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