چکیده:
Hydrological processes and their spatial distribution directly are relevant to climate, topography, geology, and land use in the watershed. Therefore, use of a model whit integrity and high performance for simulating the process in deferent watersheds is very important. In this study was assessment performance of semi-distributed SWAT model in simulating hydrology processes in three watersheds with different climate: Jazmurian basin with 1258 (km2) in an arid climate, Khorramabad watershed white 2467 (km2) in a semi-arid climate and Talar watershed white 2057 (km2) climate in semi-humid climate. To this purpose, maps land use, soil, digital elevation model, and meteorological data in daily step collected from many stations for each region. After running the SWAT model, the
calibration and validation model did whit SUFI2 algorithm. Performance models were assessed with statistical coefficients NS, R2 and bR2. The results showed that the values of these coefficients in Jazmurian basin is 0.56, 0.54 and 0.20, in Khorramabad watershed is 0.68, 0.72 and 0.32 respectively and in Talar watershed is 0.64 0.66 and 0.31 respectively. Overall, the results showed that the SWAT model performance in Talar watershed is higher than the other watersheds.
خلاصه ماشینی:
In this study was assessment performance of semi-distributed SWAT model in simulating hydrology processes in three watersheds with different climate: Jazmurian basin with 1258 (km2) in an arid climate, Khorramabad watershed white 2467 (km2) in a semi-arid climate and Talar watershed white 2057 (km2) climate in semi-humid climate.
Simulated the river flow discharge of Haraz catchment using the SWAT model at Karesang hydrometer station (located at the outlet of the catchment), the R2 and NS coefficients were 0.
Estimating runoff generated in a catchment as well as predicting numerous hydrological processes associated with certain complexity in some areas, is one the key issues in hydrological studies, which the required basis information for most of the water resources projects, watershed projects as well as many related projects is established by obtaining these data (Razavi and Coulibaly, 2013).
According to this study could provide a better understanding of the impact of catchment on the water balance characteristics of the area and its influence on the performance of the model in simulating flow discharge of these areas.
Annual average of area hydrologic After running, the model on the watershed, average runoff, soil water, and evapotranspiration obtained in study areas (Table 3).
As in the model validation period in Khorramabad catchment, the average observational and simulated discharges were 5.
4. Conclusion In the current study, the distributed model of SWAT in ArcGIS, as well as uncertainty analysis algorithms of SUFI2 in SWAT-CUP program successfully used to simulate runoff and water resources components in semi-arid and semi- humid catchments.