جستجوی مقالات مرتبط با کلیدواژه « شرق اصفهان » در نشریات گروه « جغرافیا »

Drought and territorial effects have changed the aridity to a major crisis on the resistance of economic life of many villages in dry and semi dry areas. Now drying the Zayanderood river is one of the most challenges of Isfahan province that in addition to the social tensions has also caused the appearance of many political and socal effects.Its effects on rural areas especially in eastern part of Isfahan has been more than the other areas. So the present practical research was done with the purpose of analyzing drought of Zayanderood and its Economic-Political consequences on the farmers of eastern part of Isfahan through a survey. Statistical population of research was the farmers of east of Isfahan who were the householders (N=41000) that according to Cochran formula and by randomly cluser sampling 380 of them were randomly selected as the sample. Questionnaire wasmade by the researcher and data analysis was done through Confirmatory factor analysis method and use of Amos and Lisrel software. Findings of the study confirmed the existence of economic and political consequences of drought of Zayanderood river on the farmers population of east of Isfahan. The results of Friedman showed that among the six considered factors the factor of the real estate and land,s price is on the highedt rank (4.45) while the economic security is on the lowest rank (2.57). Finally, the results show that the standard coefficient and the amount of calculated T of the economic and political consequences of drought of Zayanderood have had remarkable decrease among the farmers of east of Isfahan in factors like the price of land and real estate (0.71), economic security (0.87) and political stock (0.61). In the factor of dependency of the farmers to the government there was an increase(0.59) and also there was clear changes in factors like the method of river life (0.73) and people,s economic condition (0.75).

The most important center of dust production in Isfahan province is Segzi-Rudasht center. This center with an area of 801520 hectares is located in the east of the historical city of Isfahan. Despite the great economic potential, the study area is in a state of imbalance due to drought, reduction of agricultural activities, lack of employment processes and consequently unemployment and lack of demand for labor, which is due to the imbalance in the coming years. Reducing water resources and increasing particulate matter become more critical. Creating and spreading dust in the east of Isfahan. This research is a survey research and questionnaires were designed to achieve the research objectives appropriate to the statistical population of the project. In addition, observational interview methods were used to obtain more information. The validity and reliability of the questionnaire were assessed by a panel of experts using the opinions of experts in natural resources and desertification, and the reliability was assessed through a pilot study by calculating the Cronbach's alpha coefficient.In order to analyze the data and information from different methods of descriptive and inferential statistical analysis such as pca factor analysis (factor analysis), The results show that determining the degree of importance of each factor indicates the great importance of water and agriculture factors in intensifying desertification and the occurrence of fine dust in the Segzi-Rudasht pilot. There are social factors and finally development and technological factors. The extent of economic damage is only part of the enormous damage that this phenomenon has done to the system of research scope

Consequences of climate change affect many aspects of human societies. Unfortunately, the impacts of climate change has less studied and analyzed In terms of security. One of the important effects of climate reimpacts is the impact on water resources of different regions. Access to proper water resources is one of the biggest challenges in the present century, as it is limited to water resources, and the consumption and demand of it is always increasing. Hence, the situation of water resources will play a significant role in the formation of relations flow and development movement in Iran's geographic space. Due to the growing importance of water competition, identification of the positive and negative capacities of the country's hydropolivalent can be used to provide the macro and micro strategies. The present study is applied in terms of purpose. With descriptive approach following the systematic analysis of the spatial status of water resources (aqueous flows from neighboring countries and precipitation). It tries to analyze the challenges of dehydration and security consequences of water resources, especially in boundary and border areas. Dehydration and water crisis in Iran are the result of physical and economic factors resulting from poor management of water resources. Other factors such as annual rainfall, persistent drought, limited water access, population increase, climate change, water distribution, different spatial dispersion, water efficiency in different sectors of agriculture and lack of sustainable water planning can not be ignored. The above factors lead to a gradual reduction in agricultural activities, increasing tension and involvement over water resources, increasing unemployment and expanding poverty cycle, migrating to major cities and margins, emptying the land of the population, increasing trafficking, dissatisfaction.

Introduction: Trend of increasing natural resource degradation in many parts of the world, is a serious threat to humanity. Desertification is one of the manifestations of the damage that has already suffered as a scourge of many countries, including developing countries are. At present, remote sensing is one of technologies with timeliness data and accuracy suitable for monitoring land use changes in the areas of natural resources. Desertification monitoring and tracking changes, which seeks to desertification that the change could be for any reason and also collect and analyze data from activities, projects, plans and programs that may desertification range condition assessment and reporting to provide them. The purpose of this study was to evaluate changes in land use on desertification monitoring using remote sensing techniques to the agricultural lands around zayandeh rood in the East region of Isfahan. materials and methods: In this study, the image sensor of TM to date 1987, 1998, ETM+ to date 2002 and OLI to date 2014 related to the Landsat 5,7 and 8 to obtain the land use map used and then was performed radiometric and geometric correction.Then was used the color combination, the main component analysis, vegetation index and supervised classification method for detection of complications and the maximum likelihood algorithm as the most appropriate method for supervised classification in classes 9 of land cover. After production the land use map correctness evaluating operations with calculation error matrix and then was performed detection operations for these maps. Finally, for desertification of monitoring, land use years 27 changes around zayandeh rood using the comparison method is paid changes to identify and was obtained the area of each use. Results and discussion: For investigate the the process of desertification, land use changes in the period of 27 years. In order to select the appropriate bands in supplying the best color composite satellite images and operations classified in order to reconstruct the images, index optimization factor was applied. The results of accuracy assessment shows that For all the images above the 80% overall accuracy and Kappa statistics indicate that almost 80 percent. Generally good agreement between the classification and classes of users on the ground there. By comparing bit images specified land use changes in the period of 27 years, riverbank has the greatest changes during this period. So during these 27 years the river high Zayandehrood degradation, which could be due to the expansion of agricultural activities in rivers. This degradation is generally represents gradual drying of the river and go surrounding cultivated by farmers. This degradation process in the margins of the river and the gradual drying of the river towards the desertification situation in the region shows. Conclusion: In year 27 time period, Zayandeh Rood neighboring rivers has changed dramatically, so 86.43% of neighboring rivers was destroyed due to the expansion of agricultural activities vicinity of the river and drying river. Another significant changes, loss of agricultural land is notable such that 64% of this land has been reduced compared to 1987. Of reasons for the loss of agricultural land will be noted the region drought and Zayandeh Rood river drying up and Low rainfall, land use change and the proximity of the region desert. Also, has become about hectares 324.99 Of salt marsh lands to agricultural land. Moreover, the developed urban areas to its development contributed agricultural land and rangeland. Bayer lands around Zayandeh Rood Increase and also in region of rangeland lands Low and has increased Bayer lands and somewhat until agricultural land which inappropriate use of this land shows in order to the agricultural. That this is the desertification progress in the region. Generally desertification process in this period years 27 has been a growing trend.Therefore multi-temporal and multi-spectral satellite data for enhancement, especially for desertification monitoring was large capability and classification after comparison method is helpful for determine the type and direction of changes occurred. Since the development of desertification, limited to a small area and is not recommended range is therefore more effective, in addition to work sheets, other sheets around the area also evaluate the process of desertification is to allow for planning and management in the field of combating desertification exist.