A changedetection application on the evolution of

Authors: Mohammad Hossein Rezaei Moghaddam Mahdi Saghafi

Publish Date: 2006/06/09

Volume: 51, Issue: 4, Pages: 565-579

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Abstract

Kahak salt playa in South Khorasan province of Iran have special geomorphological characteristics by the presence of ephemeral saline lakes wetlands salt crusts surface accumulations of salt and zones of patterned ground Salt crusts in the soil surface are unique in the region and have laminated horizons in the playa soil Soilsurface salt accumulations are dominated by NaCl and gypsum It has been found that distribution of chemical soluble is not uniform across the playa landscape and this result influences on the variety form of patterned ground In this study the percent changes in some of the chemical elements such as NaCl gypsum and also brine extent have been calculated in the playa Indicating changes in Kahak salt playa is the main aim of this study by using remote sensing and GIS techniques In this paper techniques such as spectral unmixing maximum likelihood classification band rationing fuzzy classification and correlation relationships are discussed This contribution presents modeling of temporal and spatial changes of salinity and playa developing using combined approaches that incorporate different datafusion and dataintegration techniques for two periods of date Furthermore percent changes in the surfacepatterned ground of the playa have been calculated using texture and pattern analysis of the PCA1 Results have revealed that in the playa developing chemical materials such as sodium NaCl gypsum and also brine extent are positively correlated with each other and the most increased changes are related to gypsum and the most decreased changes are related to the NaCl Also changes in the amount of agricultural area in the playalakes margin show low effects in the desertification processWe thank Birjand Agricultural Organization for their assistance in obtaining the materials Supported to this study by the Graduate office of Tabriz University Iranian Space Agency allowing us to use the Landsat TM scene is gratefully acknowledged for Our sincere thanks are due to Professor Dr M Moazzen Department of Geology Tabriz University of Iran for his valuable suggestions during the preparation of revised manuscript Thanks are also due to the anonymous reviewers for their critical and valuable suggestions which helped to improve the text in the present form

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