NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Monitoring sediment transfer processes on the desert marginLANDSAT Thematic Mapper and Multispectral Scanner data have been used to construct change detection images for three playas in south-central Tunisia. Change detection images have been used to analyze changes in surface reflectance and absorption between wet and dry season (intra-annual change) and between different years (inter-annual change). Change detection imagery has been used to examine geomorphological changes on the playas. Changes in geomorphological phenomena are interpreted from changes in soil and foliar moisture levels, differences in reflectances between different salt and sediments and the spatial expression of geomorphological features. Intra-annual change phenomena that can be detected from multidate imagery are changes in surface moisture, texture and chemical composition, vegetation cover and the extent of aeolian activity. Inter-annual change phenomena are divisible into those restricted to marginal playa facies (sedimentation from sheetwash and alluvial fans, erosion from surface runoff and cliff retreat) and these are found in central playa facies which are related to the internal redistribution of water, salt and sediment.
Document ID
19870008789
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Millington, Andrew C. (Reading Univ.)
Arwyn, R. Jones (Reading Univ.)
Quarmby, Neil (Reading Univ.)
Townshend, John R. G. (Reading Univ.)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-CR-180181
NAS 1.26:180181
Accession Number
87N18222
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available