تحليل فازي استقرار بهينه مكاني فضاي سبز شهري در شهر ماهشهر

Fuzzy assessment of optimal location to urban green space in the Mahshahr City

اساس ظهور رويكردهاي جديد نظريه‌ اي در ساخت، طراحي و برنامه‌ ريزي شهري مانند شهرهاي سبز، شهرهاي سالم و شهرهاي اكولوژيك توجه به محيط زيست شهري و توجه بيش از پيش به برنامه‌ ريزي كاربري فضاهاي سبز در ساخت و طراحي شهرهاي پرتراكم از لحاظ كالبدي و جمعيتي مي‌ باشد. بنابراين وجود چنين كاربري در شهرهاي امروزي حياتي و ضروري است. از اين رو در مطالعه حاضر با روش شناسي «توصيفي – تحليلي» هدف پژوهش ارزيابي و تحليل مكان‌ هاي بهينه براي استقرار فضاهاي سبز شهري در شهر ماهشهر مي‌ باشد. در اين راستا با توجه به داده‌ هاي در دسترس شاخص‌ هاي تعيين كننده در دستيابي به هدف موضوع پژوهش، 11 كاربري عمده شهري در شهر ماهشهر تحت عنوان كاربري‌ هاي تجاري، فرهنگي، درماني، آموزشي، فضاي سبز، صنعتي، مذهبي، اداري، راه‌ هاي ارتباطي، ورزشي و مكان‌ هاي توريستي- تاريخي مي‌ باشند كه براي تحليل استقرار بهينه مكاني فضاي سبز از آنها استفاده شده است. براي تحليل داده‌ ها ابتدا با استفاده از توابع فازي در محيط نرم افزار Arc GIS 10 شاخص‌ هاي پژوهش (كاربري‌ هاي 11 گانه طبقه بندي شده) به عضويت فازي در آمده و سپس با استفاده از عملگر گاماي فازي (Fuzzy Gama) مورد تحليل قرار گرفته اند. نتايج پژوهش نشان مي‌ دهد آزمايش حد آستانه‌ هاي 0/7، 0/8 و 0/9 در عملگر گاماي فازي با توجه به شرايط موجود كاربري‌ ها، گاماي فازي با حد آستانه 0/9 بهتر از بقيه حد آستانه‌ هاي مورد آزمايش با لحاظ اهميت و تعادل در گرايش‌ هاي كاهشي و افزايشي كاربري‌ ها به تحليل استقرار مكاني فضاي سبز شهري در شهر ماهشهر پرداخته است. همچنين مطابق با نتايج اين عملگر قسمت‌ هاي مركزي شهر در دو بخش غربي و شرقي آن مناسب‌ ترين مكان‌ ها براي استقرار و مكان گزيني براي كاربري فضاي سبز شهري مي‌ باشد.

Introduction It is said that world population in cities will receive until 70 percent in 2030 year. Increasing of air pollution, creating very noisy environment and to damage of citizen healthy can be why is attending to green space in cities environment. However green space land use is one of the vital land uses in cities environment to creating enjoyable and healthful places for all people who live in cities. Also with increasing population and expanding urbanization, humans gradually away from nature and population density and excessive interference in the natural environment and man-made environments, environmental needs, physical and spiritual man is further shown. To address this human need to create urban gardens and green spaces within cities is artificially which will form part of the face of the city. Many theories have been put forward for sustainable urban planning and urban design issues green spaces in the main base of these ideas. Therefore, given the need for urban green spaces in today's cities has been tried using fuzzy logic capabilities of GIS and spatial analysis for the optimal deployment of urban green spaces in the city should be Mahshahr. Materials & Methods This study was a descriptive - analytical methodology in order to evaluation of the optimal spatial fuzzy of green space in the city has been made Mahshahr. Access to research data from land-use map of 1:25000 and field studies has been used. To analyze the data of the first 11 index layers land use as a commercial, cultural, medical, educational, green, industrial, clerical, administrative, communication path, sporting and tourist places - historical Arc GIS software environment using fuzzy functions by fuzzy modeling and then using the fuzzy gamma operator data analysis study subject has been dealt with. Results & Discussion In this stage we use fuzzy functions that were fuzzy linear, fuzzy small and fuzzy large functions, to converting of all layers from raster form to fuzzy form. Then we examined some threshold to find better threshold for showing of the best places to locate green spaces in Mahshar city. So after the fuzzy data using the fuzzy analytic functions, the final analysis of the data was done using fuzzy gamma operator. According to the results obtained from the test threshold Gamma function with a threshold 9/0 would be better to create a flexible compatibility between a rising or falling trend indicators have been used in the analysis to establish the optimal place to create green space in the city Mahshahr. . This is because the role of the military land use, ways of communication and land use of educational and tourist places in Threshold 7/0 and the gamma function with a threshold of 8/0 and military users of open green spaces combined with its historic sites and tourist trend has been an increase in the maximum. Conclusion This study aimed to establish the optimal spatial analysis of urban green space in the city was Mahshahr. For it was used ability of GIS and fuzzy logic. For Data analyzing was performed using after the phased implementation of the fuzzy gamma operator. In this study, we used data from 11 land uses. After the fuzzy- making data was action the final analysis with fuzzy gamma operator. The final results showed that the fuzzy gamma operator with a threshold 9/0 is better able to establish the optimal spatial analysis of urban green spaces should Mahshahr. This analysis shows that the central part of both eastern and western sections of the city is suitable for localization of green space.