جستجوی مقالات مرتبط با کلیدواژه "تغییرات کاربری" در نشریات گروه "زمین شناسی"

Urbanization and the increase of impermeable materials cause significant changes in the thermal properties of the region, which leads to the creation of urban thermal islands, on the other hand, the change of use caused by human activities leads to adverse effects on the region's environment. Plains areas are a clear example of these phenomena. The purpose of this study is to analyze the spatial and temporal changes of land use/land cover and its effects on the surface temperature of the plains of Dezful city. Landsat images in 2000-2020 were used to analyze the changes of (LU/LC) and its thermal bands to investigate LST using remote sensing techniques. Significant changes in land use were observed in this fertile plain during the study period. The highest percentage of land use change was related to the change of barren to agriculture and gardening, the second percentage land use change of water use to agriculture and gardening. During the monitoring period of 151,189, water areas decreased to half of 66,712 hectares. urban areas increased almost twice from 97,462 to 174,713. The Land surface temperature has increased during the monitoring period, the average temperature has increased in all classes of land use, but temperature increase in urban and barren classes are more than agricultural and gardening classes. The vegetation cover index increased during the monitored period, but this increase was not enough to prevent the temperature increase.

In arid and semi-arid conditions and water shortage, sensitive to water quality of rivers and factors influencing on them, is necessary. Maroon Watershed in recent decades has been prey extensive land use changes. Drought and misuse of lands were the most important factors in reducing the volume and quality of water resources in the basin. In this study, changes in land use in the watershed Maroon within four ten-year period from 1980 to 2010 using sensors of TM and ETM satellite Landsat and then the changes in water quality over the same period, and even more between 1347 and 1394, were studied over a period of 47 years. Changes in land use in order to increase residential areas and increased agricultural land in the drought occurred during the past 47 years in reducing water quality in the watershed Maroon Ideanak station output is affected. However, due to the drastic changes in land use occurred, increasing the surface of residential and agricultural land feature of lowering the quality of Maroon river water.