Affiner votre recherche
Résultats 201-210 de 296
The Analysis of Structural Landscape Changes in Tabriz City Using Landscape Ecology Principles with an Emphasis on the Connectivity Concept Texte intégral
2019
Mahmoudzadeh, Hassan | Masoudi, Hassan
Urban societies are complex landscapes that face unbalanced and exogenous growth and are rapidly changing as a result of population growth and urbanization. That is to say, non-urban, large swaths of land are consumed by cities and urban settlements, and over time they are fragmented into smaller pieces. Therefore, the present study was designed to detect and evaluate changes in the landscape structure of Tabriz metropolitan area and to evaluate the performance of landscape metrics in analyzing changes. To this end, first the land use maps for 1984, 2000 and 2018 were prepared using Landsat satellite imagery. Then, in order to analyze the changes, a combination of Landscape metrics including NP, CA, PLAND, LPI, ED, MPS, LSI, and COHESION was computed at two levels of land class and landscape using Fragstats4.2 software. The results showed that the lands used for urban settlement during this period have had the most changes and growth, in contrast to agricultural farms, gardens and green-space which have had a downward trend and have been converted to other uses. Also, the number and density of patches have increased over time, leading to the fragmentation of the landscape. On the other hand, the average size of patches belonging to constructed lands and agricultural and horticultural lands respectively increased and decreased, and caused more distortion and complexity of Tabriz city landscape through an increase in the landscape shape index. In general, the analysis of land use maps and landscape metrics clearly reveals the effects of human activities and urbanization on the surrounding environment, and the results indicate that the landscape of Tabriz has got more granular, more complex and geometrically more irregular. Then, with this decreasing connectivity, it has become more fragmented.
Afficher plus [+] Moins [-]Identification and Analysis of Key Drivers of Change in Regional Land Use Planning based on Foresight Approach in Gorgan Township Texte intégral
2019
Sedighi, Elham | Salman Mahini, Abdolrassoul | Mirkarimi, Seyed Hamed | Daliri, Hassan | Fath, Brian
Foresight analysis in land-use planning lets decision makers overcome complexity and reduce uncertainty through a focus on key drivers. This study attempts to identify the most important drivers of change in land use/cover planning in Gorgan Township with the participation of managers and academic experts towards a desired future. The approach is normative and the required data were obtained through investigation of scientific literature and land-use planning documents of Golestan Province. Interviews and meetings with experts also inform the process. Following a literature review, 77 effective factors on the future of land use/cover in the Province were identified. Among these, 22 representative factors were selected according to expert opinions. Two groups, totaling 70 people, consisting of managers of organizations in Golestan Province with links to land use planning and academic experts were asked to answer an online or in-person questionnaire of the effective factors. The structural analysis and cross-impact matrix were applied to the data. According to the result, the factors “Imperative policies”, “Technology”, “Governmental Services” and “Transportation and energy infrastructure” are the key drivers of change in land use/cover and affect the implementation of land-use planning in Gorgan Township. Both groups approved the "Imperative policies" as the most significant key driver which can affect other factors.
Afficher plus [+] Moins [-]An Investigation and Analysis of the Effect of Urmia Lake Water Level Reduction on the Development Levels of Surrounding Counties Texte intégral
2019
Mohammadi Hamidi, Somayeh | Nazmfar, Hossein | Yazdani, Mohammadi Hassan | Rezayan Ghyeh Bashi, Ahad
The discussion of environmental change is currently one of the most important challenges which the international community faces. This issue comprises one of the most extensive scientific, economic, social, and even political debates at different global levels. Severe and sustained droughts have threatened many parts of the globe at different times and have led to rapid and profound changes at the economic and social development levels. The Middle East, especially Iran, has been no exception in this regard. The drying up of water resources, including lakes, is a prominent feature of these changes that has caused problems for the surrounding habitats. The purpose of this study is to evaluate the status of development indicators in 22 cities in Urmia Lake catchment area. In recent decades, water level has decreased significantly and drought level has increased in this lake. This study is an applied research project in terms of purpose and a descriptive-analytical one in terms of methodology. Data and information were collected from sources and documents of the Census Bureau for the years 2006 and 2016. Also, Vikor method and Moran's spatial autocorrelation index in Arc Gis software were used for the data analysis. The results of the statistical calculations showed that the development levels in the catchment area have transformed dramatically over the last 10 years, from the cluster distribution of 2006 to the dispersed distribution pattern of 2016. Moreover, the employment rate has declined and the unemployment rate has increased.Comparing the various statistics, one can clearly see the negative effects of the Lake water level decline on catchment area counties over the last 10 years. The gradual decline in the Lake water level (followed by a decrease in the employment rate and an increase in the unemployment rate) is the main reason for the imbalance in the development of the region.
Afficher plus [+] Moins [-]The Spatial Impact of Socio-Economic Structure of Rural Areas on Groundwater Resources Drawdown (Case Study: Rural Settlements of Lordegan) Texte intégral
2019
Taghipoor Javi, Ali | Seidaiy, Seyed Eskandar | Barimani, Faramarz
As the most essential element of life, water has long been regarded as an indicator of development because it is inextricably linked to the sustainability of human societies, especially the socio-economic function of rural settlements. The main purpose of this study is to explain and root out the causes of groundwater resource draw-down in relation to the socio-economic structure of rural areas. The main issue is that as population growth and demand have increased (to meet the needs of rural communities), excessive exploitation and pressure on groundwater resources have been on the rise. The research data were collected through document analysis and field study. Next, the longitudinal statistics of 40 observational wells (1984-2014) were combined with quantitative observations and interviews with subject matter experts. These were then analyzed through descriptive-analytical methods using inferential statistics and GIS software. Research findings show that the implementation of land reform program, the increase of number of farmers, deep well drilling, the development of irrigated area, and the change of production method had a relationship with unnecessary exploitation and draw-dawn in groundwater level in the research area. The result of the study illustrates the fact that as the population has increased threefold in the living space of the plains, the farms have been fragmented, and numerous deep wells have been drilled, the groundwater level in the aquifer has drawdown to -22 m.
Afficher plus [+] Moins [-]Spatial patterns analysis of urban growth in Iran metropolitan regions (Case study: Tehran, Mashhad, Isfahan, and Shiraz metropolitan regions) Texte intégral
2018
Dadashpoor, Hashem | Salarian, Fardis
Residential and employment attractions urge the population to reside in regions with appropriate potentials for development. The metropolitan regions of Iran have been attractive centers for the population; this attractiveness resulted in some changes in different spatial patterns. The present research examines the effect of spatial-physical, and demographic variables on metropolitan regions of Iran in order to achieve suitable planning for future spatial development of Iran. The objective of the study is to analyze correlation, centralization, and uniformity of distribution and composition of spatial patterns of development in the metropolitan regions. To do this, Shannon entropy, spatial Gini coefficient, spatial density index, and Kriging Estimator were employed. The results showed a trend that dictates on a decrease in concentration in metropolitan regions, which has manifested in different spatial patterns. In Tehran metropolitan region, the trend of development goes into polycentric with sprawl in the peri-urban and rural area. According to the development trend of population centers in Tehran, it can be said that at the same time of concentrated centralization, other settlements have played an effective role in the spatial structure of this metropolitan area, and strong road network has led to the formation of such pattern. In Isfahan metropolitan region, the spatial structure has changed into concentration. This has happened with an unbalanced distribution to a radial pattern. While Mashhad metropolitan region has a monocentric linear pattern, Shiraz shows a monocentric and sprawl in the periphery. This can be attributed to the small growth of settlements compared to the metropolis.
Afficher plus [+] Moins [-]Investigating the Relationship between the Spreading of Human Settlements and Instability of Agricultural Water resources in the Zayandeh-Rud Basin Texte intégral
2018
Rahmani Fazli, Abdolreza | Salehian, Saeid
The Zayandeh-Rud Basin, placed in the center of Iran, is one of the areas with water instability problems. In the last decade, the water resources of the basin have decreased. Thus, that part of the length of the river in the middle and downstream of the water flow has dried or temporarily turned off, and the allocation of agricultural water to the agricultural lands of these sectors has decreased significantly. In this study, ground-level land use changes were analyzed through Landsat satellite imagery analysis in 2000, and 2014. These periods coincided with the periods before and after the occurrence of the instability of water resources in the basin. The researchers specified the research area and then divided it into three parts, naming upper, middle, and downstream. At the next step, these parts were compared in the form of 6 categories of use. According to the results, during the period, along with the occurrence of water resource instability, construction and residential land use across the rangelands has increased, and land use of pasture has decreased. Agricultural coverage has increased in the upstream, but it has decreased in the middle and lower parts. Besides, the empty and blank land use on the upstream has decreased, and it has increased in the lower parts. Regarding the results, some of the instability of agricultural water resources in the basin could be attributed to the expansion of settlements, increase in water consumption throughout the area, and increase in agricultural activities in the upstream basin.
Afficher plus [+] Moins [-]Assessing Tourism Attractions of Gharahsoo Watershed Based on the Impact and Effectiveness of Environmental Criteria Texte intégral
2018
Ahmadi Mirghaed, Fazlolah | Mohammadzadeh, Marjan | Salmanmahiny, Abdolrassoul | Mirkarimi, Seyed Hamed
Identifying tourism attractions is a basic requirement in the local and national community toward balanced and harmonious development of land potential. This study aimed to evaluate the tourism attractions of Gharahsoo watershed in Golestan province, northeast of Iran, based on the impact and effectiveness of environmental criteria. After determination of criteria and preparation of layers, criteria analysis was done based on the impacts and effectiveness of the criteria using DEMATEL method. Entropy Shannon method was used for weighting criteria. Finally, the spatial analysis was done by employing the TOPSIS method. The results showed that landform and plant density, in terms of the impact, and access to facilities, in terms of the effectiveness, have priority over the other criteria. Also, the criteria weighting results showed that the criteria access to facilities, landform and plant density with the value 0.229, 0.147 and 0.123 are a priority to the other criteria, respectively. Finally, the results showed that, in terms of tourism attractions, the areas of the southern of Gharahsoo watershed are in suitable conditions and the rest of the area, especially the northern parts, has unsuitable conditions.
Afficher plus [+] Moins [-]Spatial and Temporal change of costal and non-costal urban form in Mazandaran province using landscape metrics Texte intégral
2017
Rezaei, Fatemeh | Falahatkar, Samereh | Dadashpoor, Hashem
Land cover always has changed due to human activities and natural phenomena,. Intensive and variety of these changes in urban environments are more than others. The objective of this research was assessment of the temporal and spatial changes for two coastal cities (Chalus and Babolsar) and two non-coastal cities (Ghaemshahr and Amol) in Mazandaran province with the view to compactness, complexity and centrality of urban form using landscape metrics. The research methodology was a quantify method and the land use maps were produced in three classes (urban, cropland and water) by maximum likelihood classificationusing Landsat satellite images. For landscape change analysis 12 landscape metrics were used in the class and landscape level. The results show that the NP for cropland in four cities increased, which represent fragmentation, loss of continuity and interference in cropland. Additionally, increasing trend of number of patches was observed in two cities Ghaemshahr and Babolsar in landscape level that showed fragmented structure in these cities. Also, ENN-MN decreased only for Ghaemshahr that means high centralization was occurred in this city. Generally, the significant difference was not observed between coastal and non-coastal cities with the view to compactness and complexity.
Afficher plus [+] Moins [-]Foresight Settlement System in Scenario Planning, Improvement Regional Planning (Case Study: Isfahan Province) Texte intégral
2017
Parizadi, Taher | mostafavi saheb, soran | Shah mohamadnejad, Somaye
Regional Foresight, which focuses on some of the specific land area in a given territory sub-national aims to achieve the desired future decisions, will be operational. This article examines the spatial organization of Settlement systems in Isfahan province And Presentation of the urban system in the horizon 1420. This paper tries to identify the key factors influencing the development process at the regional scale, producing both possible and probable scenarios to provide the in the next 25 years Isfahan province. This research is a combination of documentary and survey methods in terms of category and is based on new methods in the science of future studies, analytical and exploratory in terms of nature, which is conducted by a combination of qualitative and quantitative models. Structural analysis are used to analyze data by use of MICMAC software. The results indicate that the key and strategic variables of Isfahan province development in Horizon 1420 includes: the way of countrys macro management, the way of managing the province, water resources, inter-institutional cooperation, population,Research & Development, role of transnational Province, Investment security, Industrial Production and mineral, level of IT, Tourism,production technology. Based on the findings, Isfahan province in terms of arrangement space systems will face in the next 25 years with five main scenario: Radial scenario, a scenario dismissed Islands, a cluster scenario, the scenario of multi-center, network scenario. Among the scenarios planned, the network scenario we can see the functional spatial integration in the region and the development integrated and balanced space.
Afficher plus [+] Moins [-]Prediction the Most Suitable of Agricultural Zones in the Tajan Watershed Using Multi Criteria Evaluation (MCE) Approach Texte intégral
2017
Rajaei, Fatemeh | Esmaili, Abbas | Salmanmahiny, Abdolrassoul | Delavar, Majid | Gholipour, Mostafa | Massah Bavani, Alireza
In recent decades almost of land use changes without taking capabilities and limitations of environmental have caused environmental problems and known forms of soil degradation and aquatic ecosystem pollution. The purpose of this investigation is determining how to mitigate the effects of future land use changes in Tajan watershed by investigating ecological potential as a strategy for natural resource conservation. Therefore, the land change modeling (LCM) was used for the analysis of possible future land useand then using Geographic Information System (GIS) and multi-criteria analysis (linear weighted combination) was determined the most sustainability of agricultural areas. The results showed that during the period from 2010 to 2040, 34 739 hectares of forest land use were declined and 27 071 and 7668 hectares of agricultural lands and pastures will increase respectively and the 3473 hectares of the most susceptible areas possible change from forest to agriculture and pasture were extracted. So expect to assessing changes land use based on the ecological potential in the future can protect Hyrcanian forests for the prevention of unprincipled changes in the coming period in this region.
Afficher plus [+] Moins [-]