Stream Flow with Snowmelt Runoff Modeling Using RS and GIS (Case Study: Pelasjan sub Basin)

In this paper snow-cover variation of a sub basin of Zayand-e-Rood watershed (Pelasjan) have been extracted and monitored using NOAA-AVHRR satellite images of 1371-72 and 1370-71. Snowmelt Runoff Model (SRM) was calibrated using the meteorological data and snow cover variation during year 1371-72. Results show that the difference between the simulated and observed annual volume runoff is 0.25% and the square of correlation coefficient (R2) between the simulated and observed daily runoff is 0.95. The calibrated SRM was verified using meteorological data and snow cover area variation of 1370-71. Results show that the difference between the simulated and observed annual volume runoff is 0.78%, and the square of correlation coefficient (R2) between the simulated and observed daily runoff is 0.92. The results of this research show that the SRM with RS and GIS can be an appropriate tools for stream flow simulation and forecasting, especially, in the watersheds which most important factor in runoff is snow melting.