Climatology
Shirin Mahdavian; Batool Zeynali; Bromand Salahi
Abstract
Climate diversity and land use / land cover change have a significant impact on hydrological regimes, especially in arid and semi-arid regions with critical water shortage problems. Therefore, estimating and evaluating climate change and land use and its consequences in each catchment is essential. This ...
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Climate diversity and land use / land cover change have a significant impact on hydrological regimes, especially in arid and semi-arid regions with critical water shortage problems. Therefore, estimating and evaluating climate change and land use and its consequences in each catchment is essential. This study examined the climate change of Kiwi Tea Basin using the data of four models of the Fifth Climate Change Assessment Report (CMIP5) under both optimistic and pessimistic scenarios (RCP8.5 and RCP4.5) using the LARS-WG6 microcirculation model. Changes in precipitation and temperature during three different periods (2040-2021, 2060-2041 and 2080-2061) compared to the base period (2019-1987) have been studied and for calibration and validation of LARS-WG6 model, observational data and output data of models with The use of F and T tests as well as RMSE, MSE, MAE and R2 indices were compared and evaluated. Based on the results of most of the models and the average of the studied models, in general, it is expected that the amount of precipitation and the minimum and maximum temperature in all the studied models will increase compared to the base period. Also, the results of evaluating land use changes with object-oriented classification showed that rangeland use with an area of 1224.18 and 1046.59 square kilometers, respectively, covered the largest area in both periods, while in 1987, residential use with an area of 3.66 square kilometers and in In 2019, water use with an area of 3.77 square kilometers had the lowest area. Also, the most modified use of rangeland use was dryland agriculture (181 square kilometers), which indicates thedestruction of rangelands
Shahrivar Roostayee; Mohsen Ahadnezhad Rooshti; Mina Farrokhe Someae
Volume 18, Issue 50 , February 2015, , Pages 189-206
Abstract
Urbanگستردگی شهری نوعی الگوی رشد شهر بدون توجه به عواقب و اثرات اقتصادی، اجتماعی و محیطی آن است. sprawl is an urban growth patterns regardless of the consequences and economic, social and environmental effects. This exterior growth ...
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Urbanگستردگی شهری نوعی الگوی رشد شهر بدون توجه به عواقب و اثرات اقتصادی، اجتماعی و محیطی آن است. sprawl is an urban growth patterns regardless of the consequences and economic, social and environmental effects. This exterior growth of the city belongs to the type of urban development that in critics view causes the loss of agricultural land, destruction of open and green spaces, energy waste and changes of land use. There areروش های متعددی برای آشکارسازی تغییرات یک منطقه با استفاده از تصاویر ماهواره ای وجود دارد که هر کدام دارای مزایا و محدودیت هایی هستند. several methods for detecting changes in a region by using satellite imagery; each one having both advantages and limitations. روش فازی مبتنی بر شدت انطباق یکی از این روش ها اFuzzy ARTMAP method of compliance is one of these methods. هدف اصلی از این مقاله توصیف آشکارسازی تغییرات کاربری اراضی در شهر ارومیه در طی یک دوره 27 ساله استThe main purpose of this article is describing land use change detection in Urmia city over a period of 27 years. For this purpose TM sensor of Landsat satellite in the period of 1984-2011was selected. پس از زمین مرجع کردن تصاویر با استفاده از روش فازی به طبقه بندی After referencing images by using Fuzzy ARTMAP classification method (CrosstabCross Tab) تغییرات کاربری اراضی و چگونگی گسترش شهری پرداخته شده است؛ و با استفاده از روش ترکیبی زنجیره های مارکوف و سلول های خودکار گستردگی شهری برای سال 1400 پیش بینی شده است.) land use changes and how the sprawl city were classified and urban sprawl was predicted for the year 1400 by using Markov chains and a combination of cellular automate. نتایج نشان می دهد طی این دوره 17188.56 از اراضی شهر ارومیه تغییر کاربری داده است؛ که بیش ترین تغییر کاربری اراضی در اراضی کشاورزی آبی صورت گرفته استThe results show that 17188.56 acres of land has been changed during this period in Urmia and most of land use changes have occurred on irrigated agricultural lands. 7672.41 هکتار از اراضی کشاورزی آبی کاسته شده اس7672.41 acres of irrigated agricultural land has been declined. The sبررسی ها نشان می دهد در سال 1400 در حدود 2408.55 هکتار به اراضی ساخته شده اضافه خواهد گردیدstudy show that in the year 1400 approximately 2408.55 acres will add to built-in land; which may cause change in land use in Urmia city and instability in the optimal distribution of services and access for city residents.
