A Comparative Analysis of WinSRFR and SIRMOD Software for Simulating Surge and Alternate Furrow Irrigation Performance in Maize Fields

In order to compare of WinSRFR and SIRMOD software in simulating furrow irrigation performance, a field experiment was carried out in the Jayedar Plain. Five different furrow irrigation methods including conventional furrow irrigation (CFI), surge irrigation with on/off cycle ratios of ۱ and ۰.۵ (SFI۱-۱ and SFI۱-۲, respectively), fixed alternate irrigation (FFI) and variable alternate irrigation (AFI) were investigated. A total of ۱۵ irrigation evaluations were performed at the initial, middle, and end of the growing season by measuring inflow rate, cutoff time, outflow rate, infiltration and advance time. The length and spacing of experimental furrows were ۱۲۰ and ۰.۷۵ m and the inflow and cutoff times at the initial (۳rd irrigation), middle (۶th irrigation), and end (۹th irrigation) were ۰.۲۸ L/s and ۲۴۰ min, ۰.۴۲ L/s and ۳۶۰ min, ۰.۳۵ L/s and ۳۰۰ min, respectively. The WinSRFR ۳.۱ and SIRMOD software were calibrated, assessed, and compared using field measurements based on the zero-inertia model. WinSRFR and SIRMOD softwares demonstrated a strong correlation between the measured and simulated values of runoff, infiltration and advance time (coefficient of determination of (۰.۹۹۸۴, ۰.۹۹۷۶), (۰.۹۹۰۸, ۰.۹۹۳۲ ) and (۰.۹۴۴۹, ۰.۹۳۳۱), respectively. The relative error values of WinSRFR and SIRMOD Software in estimating runoff, infiltration and advance time were (۲.۹۶, ۳.۱۵), (۳.۰۳, ۳.۳۰), (۲.۰۹, ۲.۴۶) respectively. Both software overestimates the runoff (λ=۱.۰۲۹۶ in WinSRFR and λ= ۱.۰۳۱۵ in SIRMOD) and the advance time (λ=۱.۰۲۰۹ in WinSRFR and λ= ۱.۰۲۴۶ in SIRMOD). The WinSRFR software underestimates infiltration (λ=۰.۹۶۹۷) but SIRMOD software overestimates infiltration (λ=۱.۰۳۳۳). The results of this study show that AFI is a more suitable method for maize irrigation in the study area. The WinSRFR software has an advantage over the SIRMOD software in simulating furrow irrigation performance due to its higher ability and the use of a wide range of input parameters.

کلیدواژه ها:

Furrow irrigation ، performance assessment ، Runoff ، Infiltration ، WinSRFR ، SIRMOD