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Earthquake is one of the major natural hazards which specifically makes cities of developing countries more vulnerable to probable earthquakes in comparison to developed countries. Tehran as the biggest and most populated city of Iran due to the active faults in the vicinity of it and its high population and constructional density has great vulnerability to probable earthquakes. The territory of Accessibility Network has a significant role in earthquake vulnerability reduction, so if the Accessibility Network can be ordered according to standard principal of urban planning, the vulnerability can be decreased. To obtain this purpose the environmental assessment is the basis element and there are lots of different methods and techniques. Present paper with emphasis to the studies in the observed field(Located in the 6th district of Tehran Municipality) and the presented conceptual framework, which is a composition of Analytical Hierarchy Process, Fuzzy logic, Network Analyst and Probability Function; analyses the probable vulnerability due to relevant factors to Accessibility Network in the case of earthquake.  The proposed model represents an explicit and intelligible frame based on the available information for the earthquake vulnerability assessment due to access base criteria. Using this model provides a proper and scientific basis for the accurate perception of access to these vital centers during and after probable earthquakes. The outgoing in the mode of map, chart and graph illustrate the resultant condition of parcels in the studied area. The produced vulnerability map can be used in site selections of these centers and vulnerability reduction programs by relevant organs such as Crisis Management Center, Emergency centers, Fire stations, Municipalities and etc.

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Different people have different perceptions of physical space where movement and rest occur. In this regard, perception of three-dimensional space from the point of view of stationary and moving observers can be analyzed from different perspectives including the observer's favorable or unfavorable perception, persistency and recall capability of the perceived space, the influence of different design variables on the perception, etc. But one of the most important issues which has not attracted due attention in this area and will form the subject of the present study is that of deliberate distortions in the "perception of subjective depth and distance" of a path or space. Indeed, by using the perception of depth and distance and the deliberate distortions in the field of urban design, designers will be able to change this perception experience via informed arrangement of spatial qualities as appropriate in line with the overall design objectives. This way, they can represent a route as shorter or longer than its actual conditions in the minds of observers and users of space. In this paper, among various theoretical approaches about the human visual system function in relation to the perception of depth and distance, cue approach is discussed due to greater emphasis given to it in scientific literature published in recent years as well as its comprehensive theoretical perspective. Based on this approach, in the first part of this article, an attempt has been made to review and analyze the most significant components affecting the perception of depth and distance using a scientific approach via urban design perspective. These components can be integrated or reduced in order to directly control the relative amount of depth and distance perception in the physical space. In the second part, deliberate distortions and their application in design of physical-spatial structures of urban environment in a practical approach are discussed. Upon on the purpose of the study it is based on applied research. Due to complexity of depth and distance perception, we used the combination of exploratory and descriptive-analytical research as the methodology. Keywords: Urban Design, Perceptual Depth and Distance, Cue Approach, Deliberate Distortions, Practical Optical Illusions

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Aims: Cities and their surrounding areas provide the ground for creating opportunities. Moreover, these places reveal systematic socio-economic fault lines, gaps, inequalities, and structural poverty. Cities are centers where ecosystems cross their functional thresholds and reinforce inequalities and vulnerabilities with increasing demands and pressures on limited natural resources. Therefore, it is time to move quickly from the extraction-based model in the last century to a renewable, flexible, and nature-based model which accepts the limitations of our world. 

Methods: Therefore, this study aims to identify the concept of productive city as a novel concept in the theoretical field of urban planning using the systematic review method based on a four-stage model via formulating the search strategy of papers and search process considering terms of productive city, productive urban planning, urban productivity and nature city in the top citation databases. In total, 214 papers were identified from 2013 to 2022 in the initial search, 68 of which were selected as eligible for deeper investigation and response to the research questions. 
Findings: This research indicate since adapting to the effects of climate change and resilience against environmental hazards requires a long-term perspective based on understanding nature. 
Conclusion: applying the concept of the productive city as a nature-based approach, guaranteeing social regeneration, economic and ecological sustainability, and functional-spatial continuity of cities in facing the upcoming challenges and environmental hazards, and reduce the pressures on natural resources. Furthermore, this seems necessary in contemporary urban development plans.

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Different people have different perceptions of physical space where movement and rest occur. In this regard, perception of three-dimensional space from the point of view of stationary and moving observers can be analyzed from different perspectives including the observer›s favorable or unfavorable perception, persistency and recall capability of the perceived space, the influence of different design variables on the perception, etc. But one of the most important issues which has not attracted due attention in this area and will form the subject of the present study is that of deliberate distortions in the «perception of subjective depth and distance» of a path or space. Indeed, by using the perception of depth and distance and the deliberate distortions in the field of urban design, designers will be able to change this perception experience via informed arrangement of spatial qualities as appropriate in line with the overall design objectives. This way, they can represent a route as shorter as or longer than its actual conditions in the minds of observers and users of space. In this paper, among various theoretical approaches about the human visual system function in relation to the perception of depth and distance, cue approach is discussed due to greater emphasis given to it in scientific literature published in recent years as well as its comprehensive theoretical perspective. Based on this approach, in the first part of this article, an attempt has been made to review and analyze the most significant components affecting the perception of depth and distance using a scientific approach via urban design perspective. These components can be integrated or reduced in order to directly control the relative amount of depth and distance perception in the physical space. For example, the first part of the present article addressed the influence of light, color, perspective etc. On depth perception. Obviously, if we can exaggerate the natural conditions of these signs via representation and re-design, we will be able to bring about a deliberate change in depth and distance. Indeed, measures such as taking advantage of oval forms in flooring instead of circular ones, making informed changes in the perspective view of a pathway or set of buildings, using purposeful color palettes and planned lighting and the like can leave a significant impact on depth and distance perception. In the second part, deliberate distortions and their application in design of physical-spatial structures of urban environment in a practical approach are discussed. In sum, based on discussions presented in this paper, it can be said that the relative contribution of each of structural features of a space, semantic features of visual scene and other factors in the formation of distance and depth perception errors is not known. Moreover, we still cannot consider a desired visual scene and determine whether there are spatial perception errors in memory. Such predictions will not be possible until we have richer and more objective words at hand to describe many possible spatial relationships between the observer and the elements in front of him, as well as the three-dimensional spatial structures.Such terms can form the basis for testing and describing the effects of different variables on perception issues. As mentioned in the article, practical application of depth and distance design and deliberate distortions in urban design can enable designers to change this perceptual experience. This will be possible via informed arrangements of spatial-physical qualities in a direct manner and proportional to the overall design purposes so that a pathway is perceived by observers and users shorter or longer than it is. On the other hand, whether a space appears deep or shallow is in direct association with its perceived length and in turn, its perceived time. This has not received due attention in practical urban design studies. It is obvious that there is a relationship between the environment and the length of perceived time, but what should be pursued in future urban design studies is how people›s physical - behavioral actions are influenced by this relationship. Such findings can be used to meet many non-physical goals in a project. Thus, knowing aboutthe effects of physical-spatial dimensions on depth and distance perception, and thus on the pedestrians› perceived time, a designer will be able to make a short - but the important in commercial, touristic, and cultural terms- path appear longer than it is to observers. The influence can lead to a greater emphasis on the path importance and the likelihood of unconscious pauses therein, and can enhance the formation of longer-lasting mental images and memories in pedestrians› minds. On the other hand, when an urban designer has to decide on the layout and design of a long corridor, he/she can take advantage of distorting the observers› perception and perceived time to make their perceived path shorter. This, in turn, will decrease their mental fatigue, desire to change path, and inattention to activities, functions and structures towards the end of the path. On the other hand, based on what was mentioned in the present article, when we move through a space, scales and level of details of objects are variable in our experience proportional to our distance from them. Thus, our perception of an object in space varies by our distance from it, our speed and the amount of time we allocate to see a particular scene. In this regard, urban design can impose dramatic changes on the observers› perception of depth in a space through deliberate distortions in their views and perspectives. In fact, when the observer›s perception of depth changes, the arrangement and layout of various components in space can appear compressed or expanded to him/her. This compression and expansion can be deliberately applied to strengthen or weaken spatial definition in a specific physical structure. When an observer moves through a space, he/she can experience a variation and fluctuation, not only among the various levels of vision, but also among perceived deep and shallow spaces. Such fluctuation can add to the richness of movement experience in urban spaces. Upon on the purpose of the study it is based on applied research. Due to complexity of depth and distance perception, we used the combination of exploratory and descriptive-analytical research as the methodology. contrasts with usual expectations, which thinks that the telecommunications and virtual spaces can reduce the demand for spatial mobility and it’s infrastructures- but also means that the simultaneous increase in inter-regional functional relations (both electronic and physical communications) between Tokyo, Osaka and Nagoya metropolitan areas. Following this, with developing the functional integration between these areas, the distinction of previous boundaries has been faced with many difficulties. Therefore, this situation can cause to the rise of Japanese Mega city-region, named as “TOKAIDO” the greatest spatial unit in the hurt of japan. This fact may signify the rising of new possible changes in the future of urban and regional spatial structure and provide a situation in which, the current urban planning and management methods -based on industrial age spatial principals- face with many challenges. So, the restructuring of urban policy and planning in the information age may be inevitable

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This study tries to investigate relationship between rainfall parameters and USLE R factor. To gain R-factor, at first, shower kinetic energy was calculated and then its erosivity computed by using maximum 30 minutes rainfall intensity. Therefore 3 meteorological stations in Khuzestan province and one station per Kohgiloyeh & BoyerAhmad and Boushehr provinces were selected and their recorded hyetographs of 13 years were analyzed. For any hyetographs, rainfall erosivity was computed in any one month, season, or year and corresponding rainfall parameters were extracted too. Temporal and spatial variation of rainfall erosivity was studied and relationships between R factor and rainfall characteristics were investigated by using regression analysis. It was resulted that February to March and winter season has the most erosivity risk. Spatial analysis of rainfall erosivity in selected area showed that Dezful and Ramhormuz have the maximum erosivity factor. Mean annual erosivity factor of Khuzestan province was computed 28.07 ton.m/ha.h. Regression analysis showed strong relationships between rainfall amount (mm) and maximum 30 minutes rainfall intensity (cm/h) with R factor. A model that computes R-factor by means of rainfall amount was suggested.

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Accelerated soil erosion is an undesirable process that adversely affects water and soil resources. Rainfall erosivity is an important factor in water erosion models. Accordingly, the present study was conducted to estimate the rainfall erosivity throughout Iran based on the latest available detailed rainfall data while considering its temporal and spatial variations. To accomplish this, the data from 18 synoptic stations of the Iranian Meteorological Organization, known to have reliable data and hyetographs with a 23 year common period, were accordingly analyzed. The kinetic energy of rain for each storm event was calculated based on Wischmeier and Smith’s original model, i.e. the USLE, and many of its modifications. Later, the rainfall erosivity factor was calculated on a monthly, seasonal, and annual basis using the calculated kinetic energy. The results revealed that the greatest risk of erosivity occurred in March, December, and November, as indicated by R factors of 0.228, 0.201, and 0.147 MJ mm ha-1 h-1, respectively, while June and August had the lowest erosivity factors, as indicated by R factors of 0.017 and 0.027 MJ mm ha-1 h-1, respectively. Furthermore, analysis of the spatial variations in R verified that the Anzali and Babolsar Stations, located in northern Iran, had the maximum erosivity values, with R factors of 11.518 and 4.260 MJ mm ha-1 h-1, respectively. Conversely, the Bam and Semnan Stations, located in the central and eastern Iran, had the minimum erosivity values, as indicated by R values of 0.201 and 0.212 MJ mm ha-1 h-1, respectively. The long term mean annual rainfall erosivity factor of Iran was ultimately found to be 1.226 MJ mm ha-1 h-1.

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Aims The complexity of today`s urban issues are such that researchers and urban designers can not manage to to focus on all topics simultaneously and explain the consequences of their decisions and their designs in urban spaces. Space syntax logic, which is one of the mechanisms that can help in overcoming these types of problems, uses software that has high accuracy in mathematical calculations and presentation of graphic maps. The purpose of this research is to investigate the qualities of the spatial dimension and the experience of pedestrians in Resalat Square, Tehran.

Methodes in this study, while using DepthMap software due to observations and interviews with residents, retailers and pedestrians and observing the problems of citizens' access to different parts of the square, the technical weaknesses of software related to space syntax logic were identified and the strengths and weaknesses were achieved through SWOT technique.

Findings After reviewing the preliminary results and observing the methodological contradictions, the field survey was renewed inorder to reveal the additional requirements. The results can be considered in two aspects. Firstly, raising additional awareness to refine space syntax logic, mathematical cognition, and DepthMap software, and secondly, achieving comprehensive cognition of Resalat Square in spatial structure.

Conclusion The human experience of the city can be different from the quantitative results obtained. The final results indicate that the south and southwest areas of Resalat Square have the best state of integration and connection with other urban spaces and consequently have the greatest potential for development.
 

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Introduction
Sustainability of urban and regional life, especially in economy dimension, is one of the most important aspects in the management of cities and societies associated with urban, regional, national and international competitions. In this regard, comprehensive planning focused on identical basis of cities and regions is needed to use vernacular capacities to a sustainable and identified economic future. Attention to identical contexts, especially in the natural, cultural, social and economic aspects, leads to negative consequences such as the degradation of the environment and culture, the instability of the economy of cities and regions in global change, and the reduction of resources and injustice. The problems that many of Iranian cities and regions are involved with them undermining the economic, social, cultural and environmental identity.
One of the important issues of the research is that the Iranian cities and regions have grown regardless of the contexts and, in addition, we have witnessed heterogeneous urban growth. Uncertain loading with the identity and context of the region and cities is one of the main causes of undermining justice in the regions of Iran. Attention to the potential competitiveness on the basis of identity can lead to regional equilibrium and a fair distribution of capital and business acquisition.
On the other hand, neglecting to identities in the last decades have led to an unbalanced growth of cities and regions. In addition to regional unbalances, the issue of planning is of paramount importance to indigenous areas in Iranian different regions, which, instead of identifying the contexts and capacities of the areas of cities and regions, destroying the identity, and the natural, historical, social and cultural backgrounds and economic has intensified. The growth of irregularities in the natural, historical, socio-economic areas of the regions has weakened many areas and eliminated some of the roots of the region's competitive ability. In some areas, excessive industrial, agricultural and demolition loads and heterogeneous populations cause climate destruction, drought, environmental degradation, social harm, and injustice, rural and small-town migration to metropolitan areas, poverty and marginalization.
 Methodology
The aim of this research is to definition the contexts and strategies of identical dimensions in urban competitiveness and how to apply identical contexts in the Iranian cities and regions competitiveness. This research has been done with analytical and documentary research method with context based strategy. In order to promotion city to a competitive and identity-oriented city, the cities and regions comprehensive plan must be developed in the dimensions of identity and competitive advantages with emphasizing on competitive advantages in identical contexts.
Therefore, while addressing the above and important issues, the research questions are: Principles and strategies of urban identical competitiveness are focused on the areas of urban and regional identities. In the present study, the study on the theoretical views on urban identity competitiveness explains the theories, principles and strategies of urban and regional competitiveness, history of urban and regional competitiveness in pre-Islam era and post-Islam era was done. Then definition of urban identity competitiveness with focus on contextual dimensions and then by conclusion and analyzing these results is be done.
Results and discussion
These competitive advantages are defined and categorized in the natural, environmental, historical, spatial, religious, cultural, social, economic, scientific and sport contexts. The creation of a competitive city contains identifying potential competitive advantages, visions and applied strategies related identical contexts. The most important urban identity competitiveness strategies include the recognition of competitive advantages in the dimensions of identity and branding, innovation, facilitating competitive infrastructure, urban tourism, urban branding, location branding and location, commodity originality, and brand-oriented identical contexts.
 
 Conclusion
Competitive advantages in the Iranain cities can be analyzed in terms of homogeneous regions. In general, it can be said that most of Iran's cities are known for their natural, historical and cultural advantages. The natural benefits of rivers, springs, mitigating climates, plants, natural products, spa therapies, mountains, etc. are considered. Historical advantages include events such as the foundations of humanity, works and history, museums, and so on. Cultural advantages include a diverse range of foods, religious and spiritual events, sports and artistic and scientific celebrities, artistic industries, and unique goods. The table below shows ompetitive advantages (potential and real) in the regions of Iran. Urban, regional, national and international competitiveness in the present age faces new causes, dimensions and emergencies. It is dramatically increasing and often affecting all citizens. Competition for attracting more domestic and foreign capital, attracting more tourists, earning higher income, having cities and regions superior to the roots of the desire to compete in the city.
In order to promote the competitiveness of the Iranian cities and regions identity, the practical strategis can be used: branding of genuine local and national products, designing urban brand identity logos, identifying the terminals and airport with Iranian culture and art, establishment of local specialty brands for local cuisine, use of new technologies and tools for promoting adaptation and branding, holding national and international exhibitions and international strategies for urban diplomacy, internet branding, holding of the conference Festivals and festivals of genuine products of world culture Arts and Food and Architecture, Worldwide Specialized Brand Publishing, Global Registration of Historic, Natural and Cultural Sets, Religious and Health Promotion, Textile and Historical Improvement, Architectural Branding and Worldwide Brand Features, Exports of Essential Goods, Solving bureaucratic issues and preventing the overthrow of products and places and cities.