Urban ecology and related environmental concerns
Sh. Hosseini; M.J. Amiri; Y. Moarrab
Abstract
BACKGROUND AND OBJECTIVES: Urban ecosystem services are provided by a multitude of habitats, including green and water spaces. Such services are commonly under the control of heavy demand raised by the large number of beneficiaries. In this context, urban green spaces viz. parks and gardens supply these ...
Read More
BACKGROUND AND OBJECTIVES: Urban ecosystem services are provided by a multitude of habitats, including green and water spaces. Such services are commonly under the control of heavy demand raised by the large number of beneficiaries. In this context, urban green spaces viz. parks and gardens supply these services for city residents. From this perspective, this study is to analyze the spatiotemporal changes in the ecosystem servicevalue of urban green spaces in Districts 1 and 14 (out of 22) of Tehran Municipality, Tehran, Iran. The level of resilience (namely, capacity and adaptability) of these districts, once confronted with climate change and environmental degradation, particularly carbon sequestration, is then investigated. As an innovation, the current study ultimately assesses the ecosystem services value of urban green spaces with higher accuracy to exert more actions to improve these spaces.METHODS: This library-based documentation study utilized spatiotemporal modeling with reference to software packages and field visits. In the first step, remote sensing was applied to create land-use maps using ENVI 5.3 software package and its formulas, algorithms, and extensions. In the second step, the InVEST software and model were used to model carbon sequestration in selected districts. To assess carbon sequestration and its changes over time, land-cover maps were generated for three 10-year periods (2003, 2013, and 2023) with 30 m accuracy via Landsat satellite-based program. The maps were classified in ENVI 5.3, and the net carbon sequestration in land, along with the market size of carbon sequestration, was estimated using the InVEST model, incorporating land-use maps, land-cover types, and carbon sequestration in reservoirs. Organic carbon content was determined based on other carbon reservoirs, previous surveys, and available data. Each carbon reservoir unit was valued in dollars, and discount rates and annual changes in carbon value were calculated based on global and local conditions surveys.RESULTS: The study results obtained from land-cover/use maps produced during 2003, 2013, and 2023 in the selected districts, demonstrated a diminishing trend of green spaces and barren lands, while the area of built land has increased over time. The numerous changes in land use in the company of construction in green spaces and barren lands in District 1 from 2003 to 2013 had further led to 191401608 tons of emission, including 179114669 tons of carbon, valued 49056267 and 4636422 million Dollars, respectively. In District 14, the emission during 2003-2023 was also equal to 18.3644 tons of carbon, and that was 3444.14 tons of carbon for the period of 2013-2023, worth 1873871 and 1749769 thousand Dollars, in that order.CONCLUSION: Indiscriminate construction and development of built-up areas in Tehran have undermined green spaces and barren lands, negating the benefits of green infrastructure efforts. This has resulted in a reduction in urban green spaces, hampering their capacity for carbon absorption and sequestration. Consequently, reduced carbon deposition will contribute to higher temperatures, diminishing the resilience of these urban areas.
Urban architecture, design, development and planning
Kh. Moghani Rahimi; M. Behzadfar; S. jalilisadrabad
Abstract
BACKGROUND AND OBJECTIVES: Making society resilient is considered a critical and challenging issue in mental health planning or stress-relieving urban planning. However; although in recent years, many studies have separately addressed stress and urban resilience, no study has explained the relationship ...
Read More
BACKGROUND AND OBJECTIVES: Making society resilient is considered a critical and challenging issue in mental health planning or stress-relieving urban planning. However; although in recent years, many studies have separately addressed stress and urban resilience, no study has explained the relationship between the two. Therefore, the present study aims to explain the relationship between urban stress and urban resilience in the Region 8 of the District 1 of Tehran Municipality. METHODS: This study is applied descriptive-analytical research. The required data are collected using both quantitative and qualitative methods and analyzed by regression analysis. First, using the library method, the indicators of urban stress and urban resilience were identified, then the study sample was selected using these indicators and the Delphi method. After; that, the information related to the indicators was collected using questionnaire and library methods, and finally, the relationship between urban stress and urban resilience was investigated through multivariate regression.FINDINGS: The research findings indicate a high correlation between the two abovementioned concepts (correlation coefficient= 0.925). Moreover; the adjusted R2 shows that resilience indicators explain 83% of the total variations in urban stress. Also; the most critical indicators affecting the citizens' stress include the status of open space, gender structure of the population, permeability, average building density, education level, resident participation, spatial diversity, citizen's sense of belonging, social diversity, violence, crime, the safeness of the environment, social capital, social solidarity, the strength of buildings, vulnerability to natural hazards, income status, employment status, environmental pollution, access to services, the age structure of the population, and safety, respectively.CONCLUSION: it is possible to significantly reduce urban stress by enhancing urban resilience and paying attention to its effective indicators.
Urban social and cultural welfare
E. Jalalian; E. Nasiri Hendekhaleh; N. Ezadbin
Abstract
BACKGROUND AND OBJECTIVES: Social resilience is one of the ways to reduce social problems and is a factor for the success of social welfare programs, increasing trust and social capital; therefore, in recent years, more attention has been paid to the issue of social resilience. The present study deals ...
Read More
BACKGROUND AND OBJECTIVES: Social resilience is one of the ways to reduce social problems and is a factor for the success of social welfare programs, increasing trust and social capital; therefore, in recent years, more attention has been paid to the issue of social resilience. The present study deals with theoretical and experimental analysis of social resilience. METHODS: The aim of this study was to investigate the level of social resilience in region one of Karaj city by descriptive-analytical method. The statistical population consisted of residents of District one of Karaj city, 384 of whom were randomly selected. The researcher-made questionnaire was confirmed by face validity and Cronbach's alpha of 0.85. FINDING: Data analysis was performed using descriptive and inferential statistics in SPSS software. The results showed that the confidence component was 2.53, 1.73, 2.52, 4.14, 4.01 and 8.86 that all coefficients were higher than 2.59 at the significance level of 0.01. For the social capital component was 1.65, 6.14, 07.03, -1.01, and -0.35, which showed that all coefficients were higher than 2.59 (14, 15) at the significance level of 0.01. For the component of commonalities between residents component was 7.87, 11.74, 7.21, 0.85-1.17, 2.93, showing that all coefficients were higher than 2.59 at the significance level of 0.01. Also, the structural model of social cohesion, the criteria of goodness of fit index and the adjusted fit index were equal to 0.79, which indicates that the model has a moderate fit. CONCLUSION:The purpose of this study was to investigate and measure the criteria of social resilience among the four dimensions of resilience in the settlement. As one of the most important ideas in urban planning is to create resilient cities that are resilient to social crises, therefore, paying attention to the dimensions of social cohesion, including: trust, social capital and commonalities between residents can ensure that a high level of social resilience is created and effectively operates in accordance with sustainability in society.