جستجوی مقالات مرتبط با کلیدواژه « ظرفیت برد » در نشریات گروه « محیط زیست »

The purpose of this study is to determine the carrying capacity of sports tourism in mountainous areas by determining the three types of physical carrying capacity, real and effective.
Material and

First; 102 hectares of the area were selected as useful and usable areas by registering land points and preparing land use maps using GIS tools. In the next step, by reviewing the background, obtaining user votes and theoretical foundations of the research, the required parameters were extracted and calculated. Five limiting factors and ten parameters were used as coefficients in calculating the actual range capacity of the study site. A researcher-made questionnaire (Likert scale) with 384 people was used to score the parameters of the site management ability.

According to which the lowest score belonged to the "parking" and "relief system" of the region (1.4). Finally, the physical, real and effective carrying capacity of the study site (379848, 72930 and 40111) per day was estimated, respectively.
Discussion and

The area management must plan in such a way as to ensure the sustainable operation in addition to the use of existing land uses.

The management of social-ecological systems such as cities is extremely complicated due to the interdependence of subsystems, the cause-and-effect relationships that exist between them, and the impacts on sustainability. The necessity of ecological capacity and the ability of cities to sustain their potential to provide goods and services to both current and future generations cannot be overstated. Understanding how arid ecosystems adapt to disturbances is critical for the sustainable management of such areas, given the global extent of this type of ecosystem and its fragility, both structurally and functionally. The purpose of this study is to assess the impacts of urban growth on the carrying capacity of Isfahan, which is located on Iran's central plateau. In this regard, simulation models can be an effective tool in providing scientific decisions in dealing with complex and unknown social and ecological systems.

In this study, system dynamics modeling was used to determine the cause-and-effect relationships between variables affecting Isfahan's carrying capacity. In order to examine the landscape structure, DIVISION, SPLIT, and IJI metrics have been used to show connectivity, and ED, SHDI, and AI metrics have been used to determine the heterogeneity of the landscape of Isfahan City. After problem articulation, the model boundary was defined in the initial step of the modeling process by developing the subsystem diagram. After the population, environment, landscape, and carrying capacity subsystems were evaluated, a cause-and-effect diagram was made. The flow diagram and scenario were also made to evaluate the state of Isfahan's carrying capacity. In order to validate the model, the historical trend and simulation of two variables of urban population and the number of industries have been compared using the coefficient of determination.

The pressure factors on the urban carrying capacity were detected and analyzed by assessing key variables in the system, such as water sustainability (WSI) and air quality, as well as changes in the landscape structure of Isfahan using landscape metrics. The research findings indicate that approximately 90% of the urban water demand is dedicated to the domestic sector; therefore, the first scenario is related to the management of water consumption in this sector and its influence on the Water Supply–Demand Index. This scenario showed that if domestic water demand is not controlled, the result of this index will reach nearly 0.7 by 2040, indicating greater vulnerability to the region's water resources. The second scenario is related to the city's increasing trend of construction and the number of industries, the impact of which has been shown on the carrying capacity.

The current study's findings, based on two enlarged scenarios, demonstrated that water demand, changes in the structure of the urban landscape, and the growth of industries all have a major impact on Isfahan's carrying capacity. Therefore, by controlling and managing water consumption in the domestic sector, limiting industrial growth, preventing the destruction of gardens, enhancing urban green and open areas, and limiting the increase of impervious urban surfaces, Isfahan's carrying capacity will improve.

Functional infrastructures act as an integrated system to support sustainable development.Therefore, it is worthwhile to use appropriate methods to evaluate the range capacities of functional infrastructures as well as the balance between them.In this paper, the FUICC Catastrophe Model (FCM) has been used to evaluate the balance between the range capacity of different functional infrastructures in the provinces of Iran.This model uses the mean analysis of variance (MVA) and disaster progression (CPM) analysis methods. Also in this paper, the Load-Carrier model is used to reflect the support level of the functional environmental infrastructure in question. Used.The studied indicators have been extracted from experimental data collected from 31 provinces of Iran by reviewing valid scientific sources in the field of functional infrastructure from 2015 to 2020 and the data used using the latest available statistics.The results of this study show that Gilan province has the highest range capacity in green space infrastructure and Tehran province has the highest range capacity in conventional functional and environmental infrastructures and also this province ranks first in the country in terms of balance between infrastructures. In relation to load-bearing analysis, it reflects the level of support for functional environmental infrastructures. Conversely, provinces such as Qom, which showed poor win-win capacity in this area, recorded good environmental environmental performance for some factors in load-bearing analysis reflecting the level of support. The result of this study indicates that there is a difference in the range capacity of functional infrastructure between the sample provinces and in some areas with factors such as political, industrial, tourist, etc. is higher than other provinces and the degree of balance between the range capacity of functional infrastructure In general, it is weak in the provinces of Iran, and also the reflection of the level of support for functional environmental infrastructure has negative fluctuations, and in general, in assessing the range capacity of functional infrastructure, there is a need for management measures.

The population of the earth between 1960 and 2018 has risen from three billion to over seven billion. During this period, humankind has made unprecedented changes in the global environment. The relationship between population and environment is a two-way relationship. On the one hand, population growth and industrial progress impact on the environment, and on the other hand, environmental changes, drought and global warming, and the melting of glaciers ... affect population dynamics. With regard to environmental issues that have become acuter in recent years due to global warming and increasing greenhouse gases, increasing attention to the problem of population growth and the impact that population growth can have on the environment, is a concern an important issue for demographers. Environmental crises, especially the water crisis in recent years, have raised the question of whether Iran is capable of sustaining this population due to carrying capacity of the land. To this end, in this study, using a library method, the relationship between population and environment has been investigated. The results of the surveys showed that with a population increase of 106 million by 1420 and 107 billion cubic meters of drinking water needed for this population, and the continuing shortage of water in the country, as well as the lack of renewable water resources, the country faces challenges in the future.