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Articles by Ali Mohammadi Torkashvand
Total Records ( 3 ) for Ali Mohammadi Torkashvand
  Ali Mohammadi Torkashvand
  The aim of this study was to investigate the effect of cane molasses and office paper (carbohydrate and cellulose sources, respectively) on total nitrogen and C/N ratio of municipal wastes compost. Each of treatments with 20 kg fresh organic wastes (decomposable municipal) in three replicates as a completely randomized design was done. Treatments including different amounts of molasses and office paper with municipal decomposable wastes that were added to organic wastes in 2 and 4 weeks after composting start (first and second stages). Treatments in free space weekly twice to turn upside down for aeration, while exercising some treatments and adding water for adjusting moisture of organic wastes were also done. After 50 days, a 100 g sample of every treatment was taken to measure total nitrogen, organic carbon, C/N ratio, EC and pH in 1:6 dry organic matter/water. Results indicated that the molasses is a suitable amendment for reclamation of compost quality properties. It held nitrogen in compost caused to reduce C/N ratio. The best time for the use of molasses was 4 weeks after composting process (first stage) that is accompanied with increase in microorganisms’ activity and temperature. In this stage, using 8% molasses had a more effect in increasing total nitrogen; on the contrary, the most effect of 4% office paper was at the first stage. Application of 4% paper at the second stage because of the increase in C/N ration than control amounted 2.64 times is not proposed.
  Ali Mohammadi Torkashvand
 

The aim of this study is to investigate the accuracy, error and precision of some models for providing erosion types map in Jajrood sub-basin, north-east Tehran, Iran. Seven models were applied for providing working units maps that four models were prepared by the integration of different data layers. Other models were photomorphic units map derived from processing satellite images, land units map and rocks erodibility map. Gully erosion intensity in 314 spots was investigated to provide the ground truth map. This map was crossed by the different working units` maps. Results indicated that the integration of land use, rocks erodibility and land units layers is a better model than other models of data layers integration from an economic and executive regards. Accuracy for this model and photomorphic units map was 89.8 and 89.0%, respectively. The least coefficient of variation (14.1%), consequently, the highest precision was related to photomorphic units` map. Land units and rocks erodibility models, because of their low accuracy and precision, are not suitable for providing gully erosion map. That is why the best model is photomorphic units map.

  Ali Mohammadi Torkashvand
  This study in Jajrood sub-basin, North East Tehran, was conducted to investigate some methods for water-soil erosion types mapping by GIS. Four models were used for providing working units` maps by integration of data layers including A. plant cover, geology and slope B. land use, geology and slope C. land use, rocks erodibility and slope and D. land use, rocks erodibility and land units. The surface, rill and gully erosion intensity in the 314 spot were controlled to provide ground truth map from each of these erosion features. Soil erosion type`s map obtained from the integration of these truth maps and then this map was crossed by the maps A to D. Results indicated that the integration of land use, rocks erodibility and land units layers is a better model for providing erosion types map than other models from an economic and executive regards. The cross of the map D with the ground truth maps of surface, rill and gully erosions showed the greatest and least accuracy are related to providing gully erosion and erosion features maps, respectively. The greatest precision of model was related to providing gully erosion map (with coefficient of variation 17.8%) and the least precision (with 40.5% coefficient of variations) was related to providing erosion features map. In conclusion, model D is suitable for preparation of gully erosion map no erosion features map. It is recommended that the same study is done in another basin with the different climate and geology.
 
 
 
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