Alireza soleimani; Sedigheh Karimi; Samira Shotorbani
Abstract
Urbanization is one of the basic challenges that the world society is facing in the 21st century. Nowadays, the irregular growth pattern of cities and irregular urban development have destructive effects on cities and their surrounding environment. In the meantime, the city of Bonab is not an exception ...
Read More
Urbanization is one of the basic challenges that the world society is facing in the 21st century. Nowadays, the irregular growth pattern of cities and irregular urban development have destructive effects on cities and their surrounding environment. In the meantime, the city of Bonab is not an exception to this rule. In this descriptive-analytical research with applied purpose, using the fuzzy method and remote sensing, the physical expansion and growth of Bonab city has been evaluated. In order to analyze the effective factors in the pattern of development and physical growth of the studied area, first, 10 related and main criteria including: slope, direction of slope, height, type of vegetation, distance from faults, distance from waterways, distance from communication network, distance from rivers, distance from rural settlements and distance from susceptible lands were referenced using the geographic information system were placed in the numerical range of zero to one. Then, the specified layers were fuzzy and membered by different functions, and lastly, the final map was prepared using fuzzy criteria and fuzzy gamma. In relation to the modified fuzzy gamma model, values of 0.7, 0.8 and 0.9 have been used to identify potential areas for the physical expansion of Bonab city. The analysis and evaluation of the accuracy of the model was done based on gamma layers and a number of raster layers, as a result the gamma 0.9 was introduced as the final layer of land suitability for the future expansion. Based on the final map obtained, it can be said that the favorable areas for the future expansion of Bonab city are mostly located in the north and northwest areas.
Mohammad Karimi Firozjaei; Majid Kiavarz; Mohsen Kalantari
Abstract
Nowadays, interlinking of structural, social, environmental and economic aspects of cities is a major problem which results from unplanned horizontal expansion of cities and their land-use changes. The purpose of the present study is to investigate the land use changes and physical expansion of Babol ...
Read More
Nowadays, interlinking of structural, social, environmental and economic aspects of cities is a major problem which results from unplanned horizontal expansion of cities and their land-use changes. The purpose of the present study is to investigate the land use changes and physical expansion of Babol city during the last 30 years and to predict the land use change’s trend for the future. To do so, Landsat multi-temporal images of 1985, 1992, 2000, and 2015 were used. The maximum likelihood algorithm was applied for classification of land use and cross tab model was used for investigation of land use changes. The scattered expansion of the city was examined through Shannon’s entropy index. Moreover, the CA-Markov model was applied to predict the land use change’s trend as well as the physical expansion of Babol city. Results of the present study confirmed the extreme physical expansion of Babol city during the last three decades. Such an expansion was the main reason for degradation of agricultural lands and green spaces around the suburbs. The growth rate of the built-up areas was 92%. The more distance from the built-up areas the less changes occurred in land uses. Also, the Shannon entropy index was increased from 0.73 in 1985 to 0.8 in 2015 which is an indication of the scattered expansion of the city. It can be predicted that besides decreasing 704 hectares of agricultural areas, a 33% growth will be occurred in built up areas from 2015 to 2040. It consequently requires the specific attention of urban managers and planners.
