نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانش آموخته کارشناسی ارشد، گروه مهندسی آب
2 دانشیار، دانشگاه تهران، دانشکده فناوری کشاورزی ابوریحان، گروه مهندسی آب
3 دانشیار، دانشگاه تهران،دانشکده فناوری کشاورزی ابوریحان، گروه مهندسی آب
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In many regions, snow cover in mountainous areas are the main source of surface and ground water supply. Thus, its very important to estimate the snow melt runoff in these areas. To achieve this objective, its necessary to estimate the basin snow cover area and its variations for a complete water year. Considering that measuring of ground snow can’t be done daily, Satellite images give a suitable information. In this study, the snow cover area as the most important hydrological variable can be extracted using TERRA- MODIS satellite images with a spatial resolution of 500 meters on daily basis. Thus, to calculate watershed snow melt runoff, the Snowmelt Runoff Model (SRM) was used. This model produces snow melt runoff using the data pertaining to meteorological parameters, hydrology and watershed characteristics. In this study, the necessary data for model application were extracted on daily basis for the years 2002-2003 and 2003-2004. Snowmelt runoff model has been calibrated using the data during 2002-2003 year. The results show that the square of correlation coefficient (R2) between the simulated and observed daily runoff is 0.93 and the difference between the simulated and observed annual runoff volume is 4.74 percent. the SRM has been performed using the 2003-2004 data. The results show that the difference between the simulated and observed annual runoff volume is 2.15 percent and the square of correlation coefficient (R2) between the simulated and observed daily runoff is 0.84. The above values show accuracy of used images in the estimation of snow melt runoff which is the sign of ability and quality of this model and MODIS images to use for other watershed regions.
کلیدواژهها [English]
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