Monitoring the changes in surface water areas of salt lake in Fars province using remote sensing indicators
Subject Areas : geoghraghybehroz sadeyn 1 , mohammad ebrahim afifi 2
1 - Department of Geography, Larestan Branch, Islamic Azad University, Larestan, Iran
2 - Member of the Faculty of Geography Department of Islamic Azad University, Larestan Branc
Keywords: Playa, Wetlands, Salt Lake, MNDWI, ,
Abstract :
Water resources are one of the most important components of land life and sustainable development. In the present study, the study of time series changes in the area of water areas of the salt lake playa of Fars province, with the help of surface reflection data of Landsat 8 satellite from 2013 to 2019 was considered and the modified normalized water difference index (MNDWI) to separate water areas. It was applied to the desired images and then the trend of water area changes was estimated. All of these processes and satellite image analysis were performed in the Google Earth Engine software environment, which is a web and open source system for performing spectral and radiometric analyzes on satellite images. ArcGIS 10.5 software was also used to prepare spatial maps. . Findings showed that the water area of the seasonal lake of salt lake in Fars province is estimated at 21426 Km based on MNDWI index and approximately 151512 km2 based on automatic water extraction index (AWEI) and 1610 km2 based on water absorption ratio (WRI) index. . On the other hand, the analysis of surface water production of Landsat images showed that the highest rate of change was related to temporary seasonal and new seasonal water zones, so that changes in temporary seasonal zones occupied an area of about 21245 km2 and new seasonal surface zones of about 352,55 km.
