فصلنامه تحقیقات جغرافیایی
سال بیست و پنجم شماره 2 (پیاپی 97، تابستان 1389)

Chele basin is located in Zagros Mountains and the border between Kermanshah and Ilam. Seems young geomorphological landforms in the region, are as a result of Quaternary neotectonic activities. The purpose of this study is assessment of young morphotectonic movements influence on landform evolution in the Chele basin، and comparing the result with the tentative indices and geomorphic evidences (young scarps، triangular facet، lack of hill slopes، impact hills and borders، braided alluvial fans and the Chele river asymmetry)، and also Ilam province station’s GPS data for 2006، 2007 and 2008. In this research, have been used GPS data, field observations, geomorphic indices (SL، AF، Fmf، Smf) topographic and geologic maps، aerial photographs and ArcGIS software to analysis morphotectonic of region. The results approved the neotectonic movements and right ward uplift in northwest Zagros. The used Tentative indices used and also evidences of transfigurated young landforms, indicated active neotectonic movements and right ward uplifts and strikes.

The purpose of this study is investigation of relationship between population dispersion and distribution of services in urban area of yazd city. Descriptive-analytic methodology was used in this study according to physical devising Housing and urbanization organization. Yazd city is comprised of 11urban areas, with areas of 13415 (ha) and 447259 population Spatial distribution of population in urban areas of yazd city is almost normal. The highest density is in the centre of the city and around and the lowest density is in the suburban and surrounding of the city. According of investigated data based on TOPSIS method using 15 indices of Urban Public Service, shahedieh area which has the lowest density of Population enjoys high rate of service distribution and area from region 3 is the most imbalanced area in terms of population dispersion and distribution of services Relationship. between population dispersion and services distribution Spearman method (0/073) was weak based on. In some areas there are clear differences between population and services which shows in Compatibility between these two variables. Thus establishing logical and coordinate relationship between population dispersion and services distribution in urban areas of Yazd city is necessary for reaching sustainable development.

In this research, temporal and spatial behavior of subtropical high pressure was studied at the level of 600 hPa. This study has been done using daily data of geopotential height at 12 GMT in NCEP/NCAR database with spatial resolution of 2.5×2.5 degree in a 55 years period including 20089 days from January, 1st, 1951(Dey, 11th, 1329) to December, 31st,2005(Dey, 10th,1384). At First, the mean geopotential height at 12 GMT was extracted for all days of solar calendar to determine spatial behavior of subtropical high pressure and its relation to the contiguous patterns. Then, an agglomerative hierarchical cluster analysis on the basis of ward linkage method has been done in Matlab soft¬ware. According to this analysis four circulation patterns in the north hemisphere were recognized. To identify temporal behavior of subtropical high pressure by selection of a suitable framework, mean of geopotential height at 600 hPa level was calculated and standardized for each day of solar calendar from 1330 to 1384. Thus, a matrix of size 19724×1 was obtained that shows positive and negative anomalies (strengthening and weakening of subtropical high pressure) in each day. Comparison between frequency of positive phase occurrence days and negative phase event days in the studied level showed that during recent 50 years the aggravation days of subtropical high pressure were definitely more than weakening days of this dynamic system. Applying contingency table method and calculating χ 2 statistic during statistical period (1330-1383) showed that occurrence of precipitation in about 3.3% of studied stations(35 out of 1066) is independent of influence of subtropical high pressure. These stations are mainly encompass South coast of Caspian sea and north west of Iran. According to this analysis, the occurrence of precipitation in 96.7% of studied stations (1031 out of 1066) aren’t independent of influence of subtropical high pressure and are under the control of subtropical high pressure at the time of predominance of this system over Iran, intensively.

Today, domicile is not only considered as the shelter but also is the security and capital resource among the inhabitants of a city. This problem which has an important role in cites formation caused many problems in view point of social indices. For example, the substructure area becomes smaller, room shortage in a residential building, per capita shortage of a person area in a house or residential building (less than 8 meters) bad habitation, homeless and etc. healthful domicile has an important role in different dimensions on spiritual and mental ease of inhabitants. So, understanding healthful domicile index and try in preparing suitable place of residence is an important matter in healthful city discussion and civic permanent development. This research is a kind of practical and developmental research and its methodology is descriptive and analytical. How is the current situation of domicile in babol in comparison with all cities of the country and suitable situation of healthful city? In answering to this question and with the aim of achieving to practical regulation of healthful city in establishment of the place of residence, have been surveyed the quantitative and qualitative situations of domicile in studied city and other cities of the country during 1365 to 1385. Comparative results of babol with other cities shows the important role of these indices. The situation of this index in babol was better than other cities. And also, in comparison with suitable situations of a healthful city shows that although, in our country, civic domicile situations are more than other countries but in many dimensions, hasn’t nearly suitable situation in comparison with suitable situation of healthful city.

Many of environmental conditions are explainable, either directly or indirectly with regard to topographical changes in pressure levels of high atmosphere. Thus, studying this subject is great importance. In this article, after determining the threshold of flood in catchment, Altitudinal data of 500 HP level for 44 storms generating floods during (1370_1384) were processed using the factor analysis method. Ultimately, based on correlation matrix (variance-covariance), main focuses of topographical changes of 500 HP level, affecting extensive and catastrophic floods were recognized and analyzed. Research results showed that, during flood occurrence, the following five focuses have the most Anomaly of 500 HP altitudinal level: 1) The area between the Red sea and south west of Iran 2) The area between the centre of Mediterranean sea and the black sea 3) The northern part of Caspian Sea 4) East of Iran 5) Northern part of Europe. Such changes in 500 HP level lead to enforcement and deepening the axis of troughs and ridges, and have produced synoptical patterns that cause floods. In the meantime the changes in 500 HP level in the first and two focuses have the most effect in creating floods of aforesaid catchments.

Tribes settlement focuses is as a development approach for tribes society. in this paper have been considered the main problems of tribes focuses. Three focuses of biggest tribes involving Bakhtiary and ghashghai were selected. The methodology of this paper is complex containing field study and analytical methods. According to the results, the main problems of tribes settlement are: support of productions, stuffiest income, support of educational – hygienic services, Concentrating to the infrastructures services such as, space frame and passage of the centers Necessity of finantialy support to complete residential units at all three centers.

In this study, ability and skill of the nesting version of the RegCM3 Regional Climate Model in simulation of monthly and seasonal amount of precipitation and temperature using four different cumulus parameterization of Grell-AS, Grell-FC, Emanuel and Kuo have been studied over khorasan area including three provinces of North Khorasan, Khorasan Razavi and South Khorasan. In this regards, 40 control runs using NNRP1 reanalysis data have been done for winter seasons of 1991-2000 over the area under study. Errors of the modeled data computed by comparing with CMAP precipitation data, NCEP temperature data and observed data of 15 synoptic weathers stations that located inside the study area. Bias and mean absolute errors were calculated monthly and seasonally. Results show that among four parameterizations methods used in this research, monthly and seasonal bias of the Grell-FC and Grell-AS with amount of +2.1 and -1mm is lower than other parameterizations scheme. Smallest bias of monthly and seasonal temperature have been found in Emanuel parameterization by amount of -0.8˚C and +0.7˚C, respectively. Results of this research can be used in development of regional climate models for issuing seasonal forecast over Northeast of Iran.