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Articles by Ghassem Habibi Bibalani
Total Records ( 5 ) for Ghassem Habibi Bibalani
  Ghassem Habibi Bibalani , Lila Joodi , Naeimeh Shibaei and Zia Bazhrang
  This study investigates the effects of vegetation on the stability of slopes using the finite element method. Parametric studies were performed to assess the sensitivity of the stability of a slope to the variation in the key vegetation and soil parameters. Results show that vegetation plays an important role in stabilizing shallow-seated failure of slopes and significantly affects stability. As Iran has a long history of landslides, this research deals with the effect of scrubs on slope stability, in particular, the economic interest such as tea and Citrus. It is well understood that vegetation influences slope stability mechanical effects. The shear strength of the soil is increased through the mechanical effects of the plant root matrix system. The density of the roots within the soil mass and the root tensile strength contribute to the ability of the soils to resist shear stress. The effects of soil suction and root reinforcement has been quantified as an increase in apparent soil cohesion. The study was carried out in Roudsar Township in Gilan State of Iran. In this area of 20 ha were considered suitable for the purposes of this study. A large part of the area had slopes of steep gradients on which tea-citrus garden was present. Soil samples were taken from an area of approximately 25 ha large for testing in the laboratory. Direct shear tests were carried out on soil samples and the Factor Of Safety (FOS) calculated. Results showed that the FOS was increased in soils with tea and citrus roots present. The global slope FOS was then determined using Bishop’s method. In this case study minimum FOS assumed 1.3, which corresponds to tea-citrus vegetation with 40-60% crown cover, a soil internal friction angle of 16° and a slope angle of 21 degree.
  Ghassem Habibi Bibalani , Zia Bazhrang , Hani Mohsenifar , Naeime Shibaei and Lila Joodi
  A pulling effect by side roots is one way in which roots help to side in-plane strong of a little depth soil mass. In contrast to the effect of vertically-enlarge roots, whereby soil is strengthened by an increase in its shear strength, the pulling effect strengthens the soil by increasing the tensile strength of the rooted soil zone. To verify whether or not a pulling effect exists in the root system of Prunus avium in the Roudsar, North Iran and to study the importance and size of this effect, a direct in situ test was led at a site in the Chaboksar Forests. The results from the site showed that, in the surface soil (0-30 cm), Side roots can provide a pull force of up to 490-712 N (Newtons) over a vertical cross-section area of 20-50 cm2, or an enhance in the pulling stability of the rooted soil by about 48.1%. The test results suggest that, together with the Prunus avium vertical roots, which keep the little depth rooted soil zone to the deep and more stable soil mass, the side roots of the Prunus avium, with their pulling effect, are able to make less against little depth instability in the forest slopes, such as little depth slide, to a certain degree.
  Hamideh Shadkami-Til and Ghassem Habibi Bibalani
  Knowledge of the process of change in vegetal biomass in perennial plant species is indispensable in a sound of range management. Research area is of rangeland of Til village from Shabestar distract with distance is 25 km from it. This area is semi arid area and this land covered with natural range land grasses. Root and shoot in these species were sampled in one stage from late March to late August roots of plants stable soils on slope and provide resistance against the forces that improve slope instability. The aim of this study was to assess which biomass quantitative is associated with differential productivity of P. kurdica species. In the research, Paronychia kurdica biomass was been studied in under-ground plant biomass in soil studying of area with measure dept of roots and height of stems, vegetal sample was collected form studying area with random plot 1x1 m statistical plant during one the vegetative season in this research. Results of this research showed plant average root dept is about 9 cm, average stem height is about 11.45 cm and average under ground of plant biomass is about 0.12 g m-2 and average over ground of plant biomass is about 0.55 g m-2.
  Ghassem Habibi Bibalani and Hamideh Shadkami-Til
  Plants can be used for animal grazing in wind erosion control to reduce water flow rates and to increase evaporation and transpiration. In the NW of Iran (East Azerbaijan province), rangelands previously used to animal grazing were changed to agricultural land use; this vegetation is unsuitable vegetation coverage. Researchers studied Chenopodium album to determine its stem biomass characteristics. Data were collected using an accidental sampling methodology (1x1 m). In total, 6 plots were identify and 30 samples were collected for this research. In the minimum, maximum and mean stem biomass for this plant were found to me 1.4, 3.8 and 2.2 g, respectively.
  Ghassem Habibi Bibalani and Hamideh Shadkami-Til
  Stem of plants can be used as animal grazing, wind erosion control, reduce water flow, increase evaporation and transpiration. In NW of Iran (East Azerbaijan province), rangelands was utilized with animal grazing and changed to agricultural land use; this vegetation is unsuitable vegetation coverage. Researchers studied Carthamus oxyacantha to determine its stem biomass characteristics. Data were collected with accidental sampling method (1x1 m) in this aria. In total of 4 plots were collected and 20 samples were studied in this research. Minimum, maximum and mean stem biomasses of this plant were 6.5, 20.3 and 10 g, respectively.
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