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Articles by S. Emamgholizadeh
Total Records ( 3 ) for S. Emamgholizadeh
  S. Emamgholizadeh and H. Torabi

In order to investigate the effect of submerged vanes in the exclusion of inflow sediment into the Veis pump station, a distorted Froude scale model is used. The physical model was constructed in the Hydraulic Laboratory at the Water and Science Collage of the University of Shahid Chamran, Ahwaz, Iran. The submerged vanes were used with three different vane arrays. The result of this research indicates that the submerged vane has effectiveness role to limit the inflow bed and suspended load sediments into water intakes. Ultimately the two rows vanes which were located outside of intake entrance were most effective and they can reduce the sedimentation 63% into the water intakes.

  I. Maroufpoor , S. Emamgholizadeh , H. Torabi and M. Behzadinasab
  For investigation of the effect of soil texture on the calibration of Time Domain Reflectometry (TDR), water content was determined gravimetrically for five textures. The experiments were carried out at the laboratory of Agriculture Collage of University of Kurdistan. For carry out of the experiments five textures and for each of them three repetitions were used. The studied textures were loamy sand, sandy loam, sandy clay-loam, clay loam and clay. The provided textures infuse inside the PVC cylinder with 30 cm height and 25 cm diameter. The vases were inside the water bath nearly 24 h. After 24 h of saturation, the soil water content of the samples was measured by oven-dry gravimetric and TDR methods. For each textures at any stage of measurement the determination of moisture and di-electric constant were carried out at three capture windows and with three repetitions. In each day the moisture measurement of each texture was carried out by these two methods until a moisture range was determined. The results of this research show that: (1) For all soil textures (loamy sand, sandy loam, sandy clay-loam, clay loam, clay) the measured moisture at the capture windows of 20 ns was more accuracy rather than other capture windows. (2) For all soil textures the TDR device can not measure the soil water content at capture window of 40 ns. (3) For loamy-sand and sandy-loam textures when the moisture was less than 20% and also for other textures for total range of measurement, the TDR device measured the moisture values less than the gravimetric method. This difference is increased when the soil ranged from light to heavy textures. (4) the comparison of the studied textures indicated that with increasing of clay content, the fitted lines slope is decreasing, but the RMSE values have increasing rate which it indicated the effect of clay content on the accuracy of TDR device. (5) From the statistical view at probably level of 1% there is not difference between the measured value of moisture by TDR device and gravimetric method. (6) For the all textures the fitted regression lines have high regression coefficient.
  A. Arman , M. Fathi-Moghadam , H. Samadi and S. Emamgholizadeh
  In order to characterize the settling properties of natural cohesive sediment adjacent to the Dez Dam wall (as a symbol of a large dam reservoir in arid and semi-arid zones), falling velocity of particles have been measured using a 2.50 m height and 0.30 m diameter column. In contrast to the traditional particle size based methods, an approach relying on time and depth variation of sediment concentration was employed to estimate the mean value of fall velocity at any depth and time. Particles in deeper depth, particularly for the samples with higher rate of sediment concentration accelerated faster and stayed at higher velocities for longer duration as a result of higher rate of flocculation. This confirms the greater effect of particle flocculation than their settling competition. The particles in all depths reached their maximum falling velocity same time around 15 min after the beginning of the tests. The low concentration samples reached higher maximum velocity as a result of lower rate of particle compaction but for a much lower duration in comparison to the higher concentrated samples.
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