The Study of rainfallimpact onMaharlouLakewatersurfacechange usingremote sensingdata

The occurrence of successive droughts, several dams on rivers, lakes and wetlands input, increasing utilization of water in the lakes surrounding areas with major problems of climate change that threatens the country's lakes and wetlandsare the major threatening factors for lakes and wetlands in Iran. The purpose of present research isstudy ofchangses in the size of Maharlou Lake through the data of temporal TM sensor Landsat Satellite on 20 March 1999 and 18 March 2009. Then the areas of lakes computed through satellite images using change and detection method by applying the supervised classification algorithm and Maximum Likelihoodon water level. The results showed that the lake area decreased to 107 square kilometers compared to 2009, which can attributed to 200 mm drop in rainfall in the given period. These conditions show that lake affected by rainfall inrecent years,which represent lakedryness in May (when rainfall was below the average(300mm)). Conversely, during the periods that rainfall was more than 400 mm, water condition filled with water throughout the lake.