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Articles by Mehdi IRANNAJAD
Total Records ( 2 ) for Mehdi IRANNAJAD
  Mohammad Alsouki , Hossein Hassani , Mehdi Irannajad and M. Ali Riahi
  The aim of this study is to describe tectono-depositional structures resultant of Cretaceous, Tertiary and Miocene tectonic activities in offshore area of Strait of Hormuz (Eastern part of Persian Gulf) using various seismic interpretation and palinspastic restoration techniques. High quality 3D-seismic data from the offshore area of Strait of Hormuz display complex structural imaging of that found at the Northeastern margin of Arabian plate. Seismic profiles show presence of two main unconformity surfaces; the lowermost is at the base of upper Cretaceous that is called Turonian Unconformity or top Bangestan group and the upper one is at base of Miocene and is named Guri Unconformity. The overlying structures of these unconformities seem to have been exposed to compressional and extensional tectonic events; one during late Cretaceous is Oman Orogeny and the other during Oligocene-Miocene epoch is Zagros Orogeny. These events had a significant role in triggering Cambrian Hormuz Salt and formation salt diapirs. Furthermore, the tectonic activities and sea level variations have played an effective role in creation of the turbidities and mass transport complexes intra Mid Miocene Mishan Formation which are considered good places of gathering hydrocarbon due to having reservoir properties.
  Mohammad Reza NEYSHABOURI , Abbas AHMADI , Hassan ROUHIPOUR , Hossein ASADI and Mehdi IRANNAJAD
  Choosing a particular textural fraction as an erodibility predictor is often confusing because various fractions of soil particles have been introduced as erodibility index by many researchers. Recently, advances in fractal theory have introduced a scaling parameter for characterizing soil fragments. The objectives of this study were (i) to test the applicability of fractal dimension of particle size distribution (PSD) for estimation of interrill erodibility and (ii) to study the relationship between interrill erodibility and soil texture components. Samples from 36 soil series with contrasting characters were collected from northwest Iran. The sand fractions were obtained by sieving, while silt and clay fractions were determined by hydrometer. Fractal dimension (DB) of PSD was estimated. A rainfall simulator with drainable tilting flume (1 x 0.5 m2) at a slope of 9% was used and interrill erodibility (Ki) was calculated for 20, 37, and 47 mm h-1 rainfall intensities. The results showed a positive correlation between Ki and clay content. The degree of dependence of Ki to soil texture fractions (sand, silt, and clay contents) was greatly affected by the rainfall intensity level. Using either texture fractions (sand, silt, very fine sand and sand) or DB did not affect the accuracy of the Ki- predicting models. As use of fractal dimension could follow the principles of uniqueness, fractal dimension of PSD may be applied as an alternative of texture fractions for prediction of interrill erodibility.
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