پايش حركت تپه هاي شني منطقه حسن آباد-جرقويه با استفاده از تصاوير ماهواره اي

چكيده انگليسي :

Monitoring sand dune movement of Hassanabad Jarghouyeh region using satellite imagery Atefeh Jebali Email address a jebali@na iut ac ir Date of Submission Mar10 2010 Department of natural resource Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Reza Jafari Email address reza jafari@cc iut ac ir Sayed jamaledin Khajedin Email address Khajedin@ cc iut ac ir Abstract Sand dunes are one of the wind erosion s facies in sedimentary stage of this process which cover considerable extent of desert regions Mobility is the most important characteristic sand dunes and an important indicators of desertification processes that causes serious threats to agricultural lands residentials and roads Therefore determining the development and movement of sand dunes are important goals in wind erosion studies in sedimentary areas Nowadays remote sensing technology is used to detect changes in the featurs of earth s surface which has improved the accuracy of change detection processes has provided better understanding of relationships and interactions between human and natural phenomena for an appropriate resource management The aim of this study was to monitor changes in sand dunes in the region of Hassanabad Jarghouyeh in Isfahan province during 32 years The range of longitudes is 520 35 54 and 520 55 57 east and latitudes is 310 58 33 and 320 26 59 north In this study in order to determine the morphology of sand dunes the potential of IRS panchoromatic band was studied Moreover the use of different satellite images was studied for land cover mapping in the area In this study MSS TM ETM and LISSIII satellite images of 1976 1990 1999 and 2008 were used respectively the morphology of sand dunes was determined using panchoromatic bands of ETM and IRS P6 images and also 1 20000 aerial photos In the preprocessing step all of the satellite images and aerial photos were georefrenced and all the RMSE of the images was less of one pixel Then the morphology of the sand dunes in the mosaic of air photo and panchoramatic bands of ETM and IRS P6 was determined in vector format In this study five facies of sand dunes were detected including transvers dunes star dunes silk seif and Akle and then the areas of the facies was calculated and compared The results showed that the area of the facies of aerial photos was similar to IRS P6 satellite image Hence the IRS image can be used as a suitable replacement for aerial photos in extensive and outback areas land cover mapping of the study area was done using different image analysis techniques Vegetation cover of the area was mapped using NDVI index the DEM map was used to extract Kouh Siyah mountain Monitoring of sand dunes was achived by appling rationing image differencing techniques on TM ETM also LISSIII image respectively other land covers were extracted using supervised classification of False Color Composite FCC and images of Principle Component Analysis PCA with maximum likelihood algoritm Finally using overlay function land cover maps were extracted with 10 classes in all images which included bare ground salt land range land sand dunes vegetation cover agriculture lands residential areas margins of wetland wetland and Kouh Siyah Error matrix used for accuracy assessment of all maps the Kappa coefficients of produced land cover maps from MSS TM ETM and LISSIII images was 0 68 0 82 0 84 and 0 90 respectively In order to monitor changes in sand dunes post classification method was used the results of monitoring showed that the area of sand dunes has changed from 14475 ha to 19561 ha in 32 years According to this amount of changes 5086 ha was as a result of internal movement in the sand dunes no dyniamic movement was detected Also The results showed that the expansion of area in the middle towards south and especially in the south of sand dunes has occured Overall it

جبالي، عاطفه

پايش حركت تپه هاي شني منطقه حسن آباد-جرقويه با استفاده از تصاوير ماهواره اي

آشكارسازي تغييرات , تپه هاي ماسه اي , پوشش اراضي , مرفولوژي