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Articles by A. Bavi
Total Records ( 5 ) for A. Bavi
  M. Behzad , M. Albaji , P. Papan , S. Boroomand Nasab , A.A. Naseri and A. Bavi
  Here a land suitability evaluation study for key productions of the region, including wheat, alfalfa, maize and barley, covering an area of 15831 ha was carried out in the region. Using the findings of the semi-detailed soil studies for this area, 2 soil families and 8 soil series in 2 physiographic units was identified. Physiologic requirements of each crop were also determined and rated based upon the proposed methods (Parametric methods and Simple limitation method). Qualitative evaluation was carried out by means of simple limitation and parametric methods (Storie and Root Square Method) and comparing land and climate characteristics with crop needs. The index obtained for barley, wheat and alfalfa was higher in comparison to that developed for maize. Limiting factors in different crop yield in the region along with climatic variables included soil physical properties, especially its carbonate contents, soil salinity and drainage. From the two methods used i.e., simple limitation and parametric methods (Storie and Square root methods), the latter (Square root methods) produced more realistic results in respect to the existing conditions of the region.
  A. Bavi , H. A. Kashkuli , S. Boroomand , A. Naseri and M. Albaji
  The sustainability of irrigated agriculture depends upon consistently achieving high irrigation application efficiency. In semi-arid areas, the portion of water that might be lost due to wind and evaporation would be significant. Thus a proper understanding of factors affecting spray losses (Ls) in sprinkler irrigation is important for developing water conservation strategies. The objectives of this study include: characterize Ls under different weather conditions and operating pressures for semi-portable hand move sprinkler system in western south of Iran (Khuzestan Province); propose adequate predictive equations by using multiple regression and Suggest several recommendations for helping about design and management for sprinkler irrigation system in semi-arid areas. The results showed that wind velocity and vapor pressure deficit were the most significant factors affecting the evaporation losses. Exponential relationships between the evaporation losses and both wind velocity and vapor pressure deficit have been found. For the operating pressures used in this study the least effect on evaporation was found. Combined losses from a sprinkler system for a given set of operation conditions have been estimated by using the results obtained from the experiments. Combined losses ranged from 4.4 to 8.9% of the applied water.
  D. Khodadadi-Dehkord , H.A. Kashkuli and A. Bavi
  Based on the shortage of water resources in Iran country and the high evapotranspiration rate in Khuzestan region (2044 mm year-1), an irrigation system on Estamaran (Sayer) palm trees in the experimental farm of Shahid Rajaee of Omidiyeh plain was conducted. This study had two purposes, namely irrigation frequency period and suitable depth of irrigation application of the Estamaran palm trees in Omidiyeh region. Irrigation frequency was the primary treatment and the evapotranspiration estimating methods were the secondary treatments. Three irrigation levels i.e., one day long (A1), two day long (A2) and three day long (A3), were used as irrigation frequency period. Also the evapotranspiration estimating methods used were, Penman Monteith 100% (B1), Penman Monteith 70% (B2), Class A Pan 100% (B3) and Class A Pan 70% (B4). Since, this study had three replications, 36 palm trees were selected for this experiment. Irrigation scheduling was done according to SCS recommendations. Experimental design was according to split plot method in a randomized complete block design. Finally by measuring different growth indices of palm trees (number of leafs, number of thorn and leaflet length) at about two years (2006-2008), the results showed that the A1B2 treatment (Penman Monteith 70% and daily irrigation), at index of number of leaves, had a significant difference at 5% level. So, it recommended as the best treatment in this plan. In comparison with the uncontrolled bubbler irrigation by local farmers, using A1B2 treatment from Aug. to Nov. (2008) (the peak months for evapotranspiration data), would have 7344 m3 water saving per hectare per month.
  H. Moazed , A. Bavi , S. Boroomand-Nasab , A. Naseri and M. Albaji
  In order to study the effects of different wind conditions, operating pressures, various sprinklers layouts and spacing on water distribution uniformity in sprinkler irrigation system a research project was conducted under 3 different wind velocities (0-5, 5-7 and > 7 m sec-1), using 3 operating pressure (35, 40 and 45 m), three spacing on the lateral pipeline (15, 18 and 21 m) and 3 different layouts (square, rectangular and triangular). Simulation experiments were conducted to estimate water distribution uniformity. The results indicated that the distribution coefficient uniformity decreased with the increase of the wind velocity. With the increase of wind velocity up to 7 m sec-1, the decrease of coefficient uniformity was not significant (the coefficient was reduced by 20% in the range of wind velocity applied). The highest water distribution coefficient uniformity was occurred on 15x5 m spacing while the lowest value was achieved for spacing of 21x21 m and sprinkler spacing to spray diameter of 0.5x0.5 with the increase of sprinklers spacing to the spray diameter, coefficient uniformity is reduced, especially at higher wind velocities. Therefore at higher wind velocities, it is recommended to reduce sprinklers spacing to spray diameter ratio and use square arrangement in order to achieve acceptable uniformity.
  S. Boroomand Nasab , A. Bavi , S. Karami and M. Albaji
  The primary objective of the present study was to evaluate the polluting sources and inflow of the Shoteit River and offer several practical solutions to reduce such contaminations. Therefore, it is essential to determine the polluting load of the inflowing wastes to the River. The polluting sources of Shoteit River can be divided into three sectors including agricultural, industrial and urban. Contaminants were identified and the polluting load was calculated accordingly. The total annual pollution load flowing into Shoteit River from the cities of Shushtar and Gotvand includes 1539 t of BOD5, 4493 t of COD and 8071 t of TDS. The result of present study, as expected, showed that most pollution of Shoteit River environment is caused by agricultural wastes having a higher discharge compared to the wastes produced by the two other sectors. Industrial polluting sources have the second largest polluting load to the Shoteit River. The urban polluting sources are in the third position. It should also be noted that solid wastes affect the pollution state of this River. After analyzing the data, several practical solutions are proposed to alleviate the problems caused by polluting inflow to the River. Alternatively, constructed wetlands can be used for primary treatment, where the wetland is the only type of treatment used and in this case, toxic effects on the aquatic plants due to the high organic loading of the influents have been reported.
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