نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه آبیاری و آبادانی پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2 رئیس گروه تلفیق و بیلان شرکت آب منطقه‌ای البرز
3 مدیر دفتر مطالعات پایه منابع آب شرکت آب منطقه‌ای البرز
4 رئیس گروه تحقیقات کاربردی شرکت مدیریت منابع آب ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The land subsidence is an important environmental issue that sometimes causes irreversible damages to the environment. Understanding the necessity of this issue and observing the field evidences of subsidence in the plains of Alborz province, current study was carried out in plains located west of the Alborz province. The methods used in this research are based on the permanent GPS data of NajmAbad station, radar data analysis and leveling of groundwater piezometric network.After extracting subsidence values and generating its raster map in the study area, the resulted map was overlaid by map of annual volume of water obtained from wells and also the map of head reduction of the aquifer. The results indicated that subsidence is strongly influenced by these parameters and even according to data of geodynamic network, seasonal fluctuations of aquifer table cause to fluctuation of the earth's surface. Based on the time series of the elevation of earth's surface, recorded on Najmabad's permanent GPS, the magnitude of seasonal fluctuations in the earth's surface has decreased during time. It was inferred that the reduction in fluctuations is related to the reduction of elasticity of earth layers, due to experiencing of higher pre-consolidation pressures. The results of radar data analysis and leveling of piezometers indicated, respectively, subsidence values up to 15 and 20 centimeters per year. The resulted values are very significant and in order to deal with potential risks, the preventive actions especially in the area of water resources management must be done.
کلیدواژه‌ها [English]
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