جستجوی مقالات مرتبط با کلیدواژه "پراکندگی شهری" در نشریات گروه "جغرافیا"

Urban expansion is one of the patterns of urban growth that causes the expansion of the central core of the city towards the peri-urban areas and the destruction of agricultural lands, gardens and natural resources and the negative effects of the environment. The purpose of this research was to investigate the pattern of physical-spatial expansion of Shiraz city and to analyze and identify factors affecting its expansion. Therefore, it is considered as one of the applied researches that used the descriptive-analytical research method. The required data and information have been collected through documents and library as well as field research, and to measure the physical growth of the city, two quantitative models, Heldren and Shannon entropy, have been used. The results show that the metropolis of Shiraz has had an inappropriate and large growth, which can be imagined as a scattered growth pattern. According to Holdren's model, about 59% of the physical growth of the city was related to population growth and 41% was related to the horizontal and spiral growth of the city. Also, the entropy index for the years 1365 and 1395 is 2.3 and 2.95, respectively, which shows its horizontal growth. This horizontal growth has taken place on agricultural lands and gardens, and as a result, it has caused the reduction of productive activities and the destruction of agricultural lands and productive gardens in peri-urban areas. Therefore, it is necessary to find a solution to preserve natural spaces and remaining resources.

The expansion of urban areas is an issue that has preoccupied planners and researchers for many years and the interest on these issues is expected to continue in the future. Such that Nowadays spatial distribution analysis, modeling and prediction of temporal variation and characteristics structure of cities - a place which has become an important research topics. Urban sprawl, a kind of urban poor is one of the major concerns of urban planners and managers. In recent decades, urban growth analysis from different perspectives to an operation essentially has become essential for many reasons.present research approach with" analysis to evaluation and ranking services the amount of thirteen districts in the triple city Noorabadi Mamasani the dependencies of Fars province. First quarters to enjoyment of these services with the use of the coefficient of Models changes and statistics examined and then using the model decision making several criteria to assess topsis and enjoying this urban slums of urban services has been dealt with. The results indicate that the discrepancies in the amount of enjoyment of the quarters of the city facilities is seen to be. So that the city central neighborhood hence of one and two neighborhood of Area two are High level. In the event that Eskan Ashaier and Dorahie neighborhoods Separated of the city center especially four and five neighborhood one area that has been scattered throughout the city Nurabad In the category of features and utilities are excluded. And Higher level includes dense and central areas the city.

In recent decades, Iran's cities, such as other cities of the third world countries have encountered significant transformations and in a short-term period, they have reached the manifold of their primary widths. Zahedan, during its 100 year life, has developed in an unbalanced way and has faced a quick development. The 32.5 time development of its population and 34 time development of its width indicate this issue compared to the first census in such a way that the development of this city has been in the horizontal direction and the continuous development of urban constructions have caused the ugly development of the city. Accordingly, in the present study, the correlation between the population and the amount of development and urban sprawl is investigated in Zahedan city using Shannon's and Holden's Entropy Models and Floor Area Ratio (FAR). The findings of the research indicate that according to Holden's model, Zahedan has been suffering the ugly urban development (sprawl) during the period of conducting the study. The entropy coefficient scores indicate the sprawl of Zahedan. Regarding the development of the value gap due to horizontal development and urban sprawl, theSmart and Compact City model is considered as a desired one for future expansion of Zahedan.