Journal of Wetland Ecobiology
Islamic Azad University of Shushtar
Abstract: (9 Views)
Despite the advancement of technology and the expansion of drip and sprinkler irrigation methods, about 90% of the world's irrigated lands are irrigated by surface irrigation. According to the report of the Iranian Agricultural Engineering and Technical Research Institute, the average efficiency of irrigation water use in the whole country, in surface systems including basin, border and furrow, is 55.3, 52.9 and 52.5 percent, respectively. Research has shown that the low irrigation efficiency in most surface irrigation methods is not related to the type of method, but rather to weaknesses in design, implementation and management. Therefore, in line with this goal, the simulation of the performance of border surface irrigation using the WinSRFR model was considered in the present study. For this purpose, studies were conducted in two parts: field and computer. The results of field measurements are related to three borders in three irrigation times. To compare the speed of advance, regression and infiltration along the border in border irrigation, the Elliott and Walker method was used. The performance evaluation indices of the border irrigation system including depth of applied water (Dapp), depth of infiltrated water (Dinf), depth penetration (Ddp), depth of Runoff (Dro), distribution uniformity lower quartile (DUlq), distribution uniformity minimum (DUmin), application efficiency (AE), requirement efficiency (RE), runoff ratio (RO), and depth penetration ratio (DP) were calculated and extracted using the WinSRFR model. The results of the WinSRFR model showed that the highest depth infiltration losses were in the second border, and its values decreased in the second irrigation due to the wet bed surface in the borders, reduced infiltration, and consequently increased advance speed compared to the first irrigation. The highest application efficiency values in all three irrigation times were for the first border in the first irrigation (B11) and the lowest in the second border in the first irrigation (B21) because in the first irrigation time, the second border had the highest depth infiltration. The uniformity of distribution in the lower quartile was also greater in the second and third irrigation times, and among the borders, border one had the most uniform distribution. Based on the results of the Win-SRFR software model, it was determined that the optimal flow rate for border one in the first irrigation was 1.28 liters per second. With this optimal flow rate, the application efficiency index can be increased from 54 percent to 100. With this flow rate, the water requirement efficiency (RE) was obtained to be 76 percent. In general, it can be said that the performance of the WinSRFR model was suitable for simulating border irrigation in the region.
Article number: 5
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