Showing 10 results for Asadi
Abolghasem Amir-Ahmadi , Majid Ebrahimi , Mahmood Habibolahian , Mohammad Ali Zangeneh Asadi,
Volume 29, Issue 4 (3-2015)
Abstract
Landslide like phenomena such as earthquake, flood, and volcano eruption are considered as the important natural events which happen every year in the mountainous and the elevated regions of the country and incur substantial damages and losses. Today, in the countries involved with the issue of earthquake sliding, there is an increasing tendency in evaluating and zoning of the danger and damages resulting from this phenomenon. Various factors such as topography, petrology, climatology, etc. are effective in the instability of the ranges and in various ways causes then instability of the ranges. In this study, in order to realize the rate of instability in various parts of the region based on Anbalagan. Firstly, the total area under study are divided into 26 work units and then the factors affecting the sliding are evaluated separately and the numerical value of each one was obtained and eventually the total scores were gathered. Based on the scores obtained, the plan of sliding ground was drawn for the total region. Studying the map suggests the fact that this region is divided into four areas in terms of landslide; the zone has been allocated with a high degree of danger of 31.13 sq. km. from the total area of the region or 18.52 % of the lands located near the villages and the roads. The region with high degree of danger 37.30% in the area of study, the one with medium danger of 23.8 %, and a zone has been allocated with low degree of danger 20.38 % from the region.
Mohammad Rahim Rahnama, Amir Asadi,
Volume 30, Issue 1 (6-2015)
Abstract
Regarding to the importance of residence in the constitution of the low of Islamic republic of Iran، in This article Housing price and Its spatial distribution in Mashhad city in account of help to decision Making have been invisbiyated. The used data's in this studing، which are exceeded of 775 sample، have been gathered from khorasan newspaper (the needs part) since April 2010 to no November 2011 for 8 montns، and their geographic specifications on the Mashhad city have been recorded. In this studing for doing necessary an analyses softwares such as، Arc GIS and GeoDa have been used. Among of used data's 62.8 percent are apartment (487 cases) and 37.2 percent are on – floor building (288 cases) means my studied cases are composed from this tow categories wich this quality and quantity. The average price of every squared meter of apartment in Mashhad is 9000000 Rials and the average prise of every squared meter of floor on is 9350000 Rials and the average price of every squared meter of residence bulding is 9170000 Rials . Never the less the spatial analyse of building price in mashhad indicate in consistent and unequel distribution of prises in different of mashhad result of Moran (index) I. There is direct and positive realationship between apartemant and one-floor building prices and quantity of residents in these areas.
Alireza Entezari, Mehdi Asadi,
Volume 30, Issue 3 (12-2015)
Abstract
The wind as one of the manifestations of renewable energies is very important for tabernacle instead of fossil fuels. The Sistan and Baluchestan province, according to its topography and position is one of the best places to build wind power plant. In this research, for potential evaluating of the wind power plants construction were considered different criteria and subcriteria in the provinces of Sistan and Baluchestan. Criteria fuzzy modeling has been down based on expert opinions and survey researches, the control points and fuzzy function type of each layers based on fuzzy membership ranging from zero to one was applied by Edrisi software. Then, in order to the importance of the information integration, Analytical Hierarchy Process (AHP) for layers weighting was implemented by Expert choice software. So, the Arc GIS software were applied for spatial analysis and overlay the layers, after the data analyzed, Sistan and Baluchestan province divided into four levels: excellent, good, fair and poor, in terms of capability the wind power plants building.Finally, the results indicated that excellent areas for the construction of wind power plants in the study area are located in the north and north Este of the study area at Zabul station with an area exceeding 1519851/64 hectares. In addition, good areas are located around the Chabahar, west and North West Zahedan and parts of southern Zabul with an area exceeding 2983473/12 hectares. It is hoped that renewable energy of wind without any pollution could be utilized by the construction of wind power plants in these places ultimately.
Fariba Hemati, Sharam Bahrami, Mohamad Ali Zangene Asadi ,
Volume 30, Issue 3 (12-2015)
Abstract
The study area, Paykola anticline, is located in the southwestern part of Kermanshah Province. The aim of this research is to evaluate the Geomorphological indexes of active tectonics in Paykola anticline as well as to study the effect of tectonic in the form and direction of geomorphological landforms. To achieve the aim of study, the lithological and tectonic characteristics of study area were obtained based on 1،100000 geololgical map. Geomorphological landforms were identified by means of Quickbird imagery as well as field work. Geomorphological indexes of active tectonics such as mountain front sinuosity, triangular facets, river spacing, drainage density, wine-glass valleys, hypsometric integral and river meander were analyzed. The presence of fairly straight mountain fronts, triangular with long base and steep slope, low drainage density, parallel drainage pattern, wine-glass valley and higher hypsometric integral of northwestern limb show that this part of anticline is tectonically active than southwestern limb.
Abolghasem Amir Ahmadi, Majid Ebrahimi, Mahmoud Habibolahian, Mohammad Ali Zangeneh Asadi, Ali-Akbar Shayan Yeganeh,
Volume 30, Issue 4 (3-2016)
Abstract
There is a harmonious relationship between the topographic forms of the surface of the earth and hydrologic systems in the geologically active regions. A quantitative estimation between neo-tectonic activities and surface processes is made to formulate and model the evolution of the land perspective. In this study, the alluvial fans of five catchment areas in Sabzevar, Davarzan, Jovein, Safi Abad and Esfarayen in Kavir Markazi (Central Desert) drainage totally amounting to 140 alluvial fans are studied. The parameters of the radius of the alluvial fan(r) and height(h) were calculated using ARCGIS and angle of alluvial fan sweep(s) was obtained using electronic protractor. Then, the volume of each alluvial fan using Church and Giles methods was obtained and linear relationship and the correlation coefficient between the volumes of the alluvial fans(V) and basins feeding them(BA) were set up. In the next step, using geomorphologic indexes, the tectonic activities of the region(Lat) were assessed. The results of this study show that although there is a significant relationship between the volume of the alluvial fan(V) and the area of the upper basin(BA), in the area under study, there is no significant relationship except in Davarzan which has a high correlation coefficient (0.742). There is no relationship between the volume of the alluvial fans(V) and the area of the upper drainage(BA) between two mentioned factors in other areas. Therefore, tectonic plays a basic role in increasing or decreasing the volume of the alluvial fans and the area of the upper basin of the alluvial fans(BA) as a subsidiary element in a way that the alluvial fans of Jovein, Safi abad and Esfarayen are classified of high geologic activities and the alluvial fans of Sabzevar are of medium geologic activities and Davarzan catchment alluvial fans are placed in the class of low geologic activities.
Liela Montaseri, Mohammad Ali Zangeneh Asadi, Abolghasem Amir Ahmadi,
Volume 30, Issue 4 (3-2016)
Abstract
Lack of water have been always one of the most obstacles in process of agricultural development in arid and low rainfall climates. During time, farmers have devised and developed numerous methods in the form of their indigenous knowledge to deal with lack of water and outcomes resulting from that. Nowadays, in the management of water resources of rural, to cope effectively with lack of water, it is necessary to seriously be considered indigenous knowledge. Conflation of indigenous knowledge of each region with new knowledge can be considered as the best option in operation of water and soil resources. In this research, we introduce and review one of the Indigenous methods maintaining water and soil in east country called "river mudding" and direct application of geomorphological effects marly hills in the kalateh-Sadat village of Davarzan city from Razavi Khorasan province. In this study, using library studies, preparation of area digital models by Arc GIS, field work and water and sediment sampling, interview with local farmers, the physicochemical experiments and statistical analysis in SPSS, is examined the positive or negative effects this method and the role of geomorphological effects in maintaining of water and soil. Results of this study show that this method is the best economic-indigenous method for maintaining moisture and restoration of soil texture lands agricultural and is water transfer agent of the permeable lands alluvial fan to agricultural lands downstream. Considering the statistical reasons and reviewing of other research in this regard, river mudding not only do not be cause incidence of significant changes in water quality of river and weakening the quality of agricultural region water, but also caused be change of texture and soil compositions, fertility of agricultural lands and As well as reduce losses due to evaporation and infiltration into the aquifer low quality.
Mehdi Asadi, Mokhtar Karami,
Volume 32, Issue 1 (6-2017)
Abstract
In order to identify the changes of spatial autocorrelation between heat clusters in Fars province, the minimum and maximum temperatures have been recorded to form a network database in Fars province. Then a 33 year period was selected for this research from the afore-mentioned database, the selected daily period was from 1/01/1980 to 12/31/2012, and an area with the dimensions of 18×18 km was added to the region under study. In order to achieve the temperature changes of these heat clusters, the newest spatial statistical methods such as spatial autocorrelation (Global Moran’s I), Anselin Local Moran’s and hot spots by environment GIS were used. The results of this study showed that the pattern of spatial and temporal variations of heat clusters of Fars Province is high-cluster. However, based on local Moran and hot spots, heat clusters in the South, South West and South East have positive spatial autocorrelation pattern (heat clusters) and parts of North and North East have a negative spatial autocorrelation (cold clusters). In the study period, a large part of the province, in most cases, almost half of the total area had no pattern of spatial autocorrelation, significant or non-significant.
Majid Ebrahim, Abolghasem Amir Ahmadi , Mohammad Ali Zangeneh Asadi,
Volume 32, Issue 4 (3-2018)
Abstract
Gully erosion is the most advanced type of water erosion in watersheds that produces large volumes of sediment that and cause a lot of damage. Thus mapping susceptibility to gully erosion and identification of factors can help managers and decision-makers to reduce the risk of erosion. The objective of the present study is to assess the capability of weights-of-evidence (WofE) and frequency ratio (FR) models for spatial prediction of gully erosion susceptibility and characterizing susceptibility conditions at Sanganeh Kalat Basin. At first, a gully erosion inventory map is prepared through extensive field study, then raster maps of the variables affecting the Gully Erosion (lithology, land use, distance from river, slope degree, slope direction, plan curvature, topographic wetness index, drainage density and altitude) in a database and Geographic Information System (GIS) was created. In total, of the 46 gullies which have been identified, 32 (70 %) cases are random algorithm selected to build gully susceptibility models, while the remaining 14 (30 %) cases are used to validate the models. The effectiveness of gully erosion susceptibility assessment via GIS-based models depends on appropriate selection of the conditioning factors, which play an important role in gully erosion. Learning vector quantization (LVQ), one of the supervised neural network methods, is employed in order to estimate variable importance. Finally, validation of the gully dataset which has not been utilized during the spatial modeling process is applied to validate the gully susceptibility maps. The receiver operating characteristic curves for each gully susceptibility map are drawn, and the areas under the curves (AUC) are calculated. The results show that the gully erosion susceptibility map produced by the frequency ratio model (AUC = 86.32 %) functions well in prediction compared to the wofe model (AUC = 73.49 %). Furthermore, LVQ results reveal that drainage density, slope degree, distance from river and topographic wetness index are the most effective factors
Saadi Mohammadi , Marizeh Talaati, Sivan Asadi , Soran Manoochehri,
Volume 33, Issue 1 (Spring 2018)
Abstract
Regarding the close relationship between poverty and vulnerability, villages that are impoverished have vulnerabilities and critical situations in terms of access to and maintenance of various types of capital. Several decades of activity based on different approaches, such as the Green Revolution, Industrialization of villages and integrated rural development, failed to solve the rural poverty issue and many of the problems caused by rural poverty remained unresolved. Therefore, a new approach that emphasized on the poor and vulnerable rural populations was needed in the field of rural development theory in order to re-establish vitality in the villages. Today, there is a huge emphasis on the elimination of poverty as one of the main obstacles to the realization of rural system sustainability. This is despite the fact that the sustainable livelihoods approach, the main emphasis to sustainable rural livelihoods and poverty alleviation is diversifying the rural economy with an emphasis on non-agricultural activities. In this regard, today, due to the widespread acceptance and potential of rural tourism development in rural areas has been proposed as a way to make and supplements to sustainable rural livelihoods. The present study was to evaluate the role of tourism in sustainable rural livelihoods of Uraman tourism target villages before the tourism development has been done due to geographical isolation and lack of infrastructure development and low level of quality of life. The research method is analytical, based on quantitative-qualitative approach. Documentary resources and field data collection, based on interviews and questionnaires distributed among 250 random households of Uraman villages which by Cochran formula of 1110 households were set volume. The results of the data analysis by descriptive statistics (mean) and inferential statistics (t single sample, t test, Wilcoxon, chi-square, Friedman) shows the positive impact of tourism as an important strategy in improving the livelihoods and security sustainable livelihoods of Uraman villages.
© 2018 Geographical Researches
Malihe Mohamadnia, Abolghasem Amirahmadi, Mohamadali Zanganeasadi,
Volume 34, Issue 4 (autumn 2019)
Abstract
Aims & Backgrounds: Considering the fact that a large part of our country is in arid and semi-arid regions and every year wind erosion and dust storms cause significant damages to the country's bio-economic resources, it is necessary to study this phenomenon. This study investigated the erosion rate of geomorphological facies of Gonabad city in relation to wind erosion.
Methodology: The wind erosion intensity was determined using wind tunnel and experimental model of IRIFR1. In the region, 17 facies were identified and mountainous and non-covered areas and areas that were not potentially dusty were excluded from the study. Sampling operations were performed on the remaining 14 facies. The samples were weighed and placed in a wind tunnel at 10 m / s for 10 minutes and then weighed again.The weight difference indicates the amount of wind erosion from a given level.Also in the IRIFR1 model 14 facies were weighted according to expert opinion.
Findings: According to the results of wind tunnel, wind erosion in the study area was highest in sand dune facies and in low and high plains and relatively high water erosion was lowest and according to IRIFR1 model in sand dunes was highest and in low and high plains and low water erosion and high pebbles were the least. Wind erosion sensitivity map was prepared in the study area and divided into five classes of rock mass and non-erosion, very low sensitivity, low, medium and high sensitivity.
Conclusion: Given that according to the analysis of samples in the wind tunnel, more than 28% of the area is in the medium to high sensitivity class, applying soil protection techniques against wind erosive power such as windbreakers, seeding and grazing reduction in these areas (especially the area Northwest) seems necessary.
