نوع مقاله : مقاله پژوهشی
1 دانشجوی دکتری /علوم و مهندسی آبخیزداری- دانشگاه مازندران، ساری، ایران.
2 استادیار/ دانشکده منابع طبیعی- دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران.
3 دانشیار /دانشکده منابع طبیعی- دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران.
عنوان مقاله [English]
Snowfall is one important form of precipitation in hydrology cycle in mountainous basin which plays reliable role on agricultural and domestic water supply in low and high flow seasons as well as on energy production. The main objective of hydrological modeling in watersheds is the better understanding of the hydrology cycle including governing processes in water cycle. Snow covered area is a basic parameter in global hydrology cycle and climatology. In this research snow melt runoff was simulated in Karadj dam watershed, using SRM model in water year 2001-2002 and validated for water year 2002-2003. SRM, a degree-day model which simulates snow melt runoff, needs 14 parameters and variables. These include rain, temperature, discharge, daily surface of snow, recession curve, snow and rain runoff coefficients, and degree-day factor. Model also needs physical parameters such as elevation boundary. Temperature and rain were distributed using gradient equation in elevation boundaries. Also physical parameters of the watershed were added to the model using geographic information system. The R2 and the deviation of the runoff volume in 2001-2002 were calculated as 0.4678, 0.1292%, respectively. These values for 2002-2003 are 0.935, 6.7736%, respectively. SRM model can effectively be used to modeling of snow melt runoff.