position of neighborhood in city sustainable development (Case study: neighborhoods of region NO 10 of Tehran)

One of the objectives of urban planners is to create the urban and neighborhood sustainable development. It is in such a way that stability can be reached in the higher levels of hierarchy of city's framing divisions and, at the end, total of cities by establishment of sustainability in the neighborhoods. Purpose of this article is to study rate of stability of the neighborhoods of region No. 10 of Tehran municipality using the Fuzzy combinational method and geographical information system. Research methodology is exploratory-analytical and, from view point of type, is applied one. For this purpose, 86 various indexes in seven dimensions of the stability, including framing, social-cultural, economical, servicing, bio-environmental, hygienic-therapeutic and urban ruling stabilities have been used, at first, in geographical information system, Fuzzy-making operations were carried out using the membership function proportional to situation of each index. After that, quantity of gamma being equal to sustainability was obtained in each dimension by combination of indexes of each dimension. Quantities of the obtained gamma are a number between zero and one. In this researches, limit from 0 to 0.1 for quantities of gamma has been defined to represent very weak sustainability rate, limit from 0.1 to 0.4 to represent weak sustainability rate, limit from 0.4 to 0.5 represent average stability rate to be inclined to weak, limit from 0.5 to 0.6 to represent average stability rate and limit from 0.6 to 1 represent powerful sustainability rate. In the continuation amount of gamma being equal to total stability of neighborhoods was determined which the limit of total sustainability has been defined in from of sustainability in the dimensions. Findings show that the sustainability situation of the mentioned neighborhoods is to be placed in the levels from average to weak (between 0.3 to 0.5). One of the regions of Tehran is region No. 10 which, with area of 817 hectares, is regarded as the smallest region of Tehran municipality after region No. 17 and possesses three neighborhoods and ten neighborhoods. With regard to the performed studies equivalent of 57% of the region level consists of residential usage. Therefore, we observe the dominance of the residential usage over the other urban functions in this region. Also, severe shortage of the usages of the green space and educational, sporting, hygienic and therapeutic space and high population density are the features of this region (Tehran region No. 10 municipality, 2011: 18). Thus, goal of this study is to survey the position of neighborhood in the urban sustainable development in which the sustainability levels of neighborhoods of the Tehran is region No. 10 have been assessed using the fuzzy method. Also, in addition to identify the capacities, possibilities and available difficulties and failures in the desired neighborhoods, the following objectives have been taken into consideration: 1. Specification of the stability level of the neighborhoods 2. Determination of the most sustainable neighborhoods 3. Determination of optimum strategies for promotion of position of neighborhoods of region No. 10 in the development of city In this research, dimensions fuzzy analysis has been in such a form that, for each index, a membership function in the fuzzy environment determined in the GIS software which have suggested the rate of benefiting of each neighborhood from that index. Quantities of these functions of fuzzy membership are between zero and one and the neighborhood whose quantity being closer to one is considered to be the superior neighborhood for that index. Then, combination of these layers was dealt with in each dimension by use of gamma operator so that the neighborhoods are compared together and sequence of their sustainability specified. Since aim of this research has been determination of total sustainability of these neighborhoods compared together, it is necessary in this step of the research that the stability layers of the raised seven dimensions are combined with gamma operator as well. And the total sustainability of the neighborhoods compared to each other has been specified. With regard to combination of results of sustain ability in the mentioned seven dimensions, this conclusion can be reached that situation of stability of the neighborhoods of Tehran is region No. 10 is in the conditions ranged from weak to average (from rank of 0.3 to 0.5). Northern Salsabil neighborhood, with amount of 0.53, is determined to be the most sustainable neighborhood among the neighborhoods of region which it is due to superiority of this neighborhood in the servicing, social-cultural, economical and hygienic-therapeutic dimensions. In the discussion of urban governorship, this neighborhood has, also, a rank higher than 0.9 which suggests a high level. After the northern Salsabil, neighborhoods of northern Karoon with rank of 0.47, Beryanak with rank of 0.46, Southern Zanjan with rank of 0.42, Southern Salsabil with rank of 0.388, Haftchenar with rank of 0.387, Solaimani-Taimouri with rank of 0.38, Shobairi-J with rank of 0.35, southern Karoon with rank of 0.32 and Hashemi with rank of 0.3 are located, respectively, whose limit is between 0.3 to 0.47. Neighborhoods of region No. 10 of Tehran were evaluated by the index in seven framing and sustainability rate of each neighborhoods was studied by use of the fuzzy method so that a comparison is to be carried out between neighborhoods in order to evaluate the rate of sustainability. The results which are obtained suggest that situation of sustainability of mentioned neighborhoods in the conditions ranged from weak to average (from rank of 0.3 to 0.5). Of problems, for example, which lead to lowering of stability rate of these neighborhoods, include dominance of residence over other usages, shortage of servicing usages and green space severe attrition of the compacted residential content which we must try to improve them.