بررسی مقایسه ای پدیده نشست زمین در اثر تخلیه آب زیرزمینی به روش SAR اینترفرومتری و GPS در شهر مشهد

Land subsidence in the city of Mashhad and its vicinity is directly related to extensive withdrawal of shallow groundwater within a depth of about ۲۵۰ m. A study of land subsidence due to groundwater pumping in the city of Mashhad, was conducted by collecting and analyzing data on the geology, hydrology, soil properties, and also casing damage. The city of Mashhad is underlain by sediments consisting of, gravel, silt, sand, and clay. To mitigate major damages from large subsidence magnitudes the phenomenon must be well understood in this area. Up-to-date and reliable subsidence information is indispensable to develop this understanding. Conventionally, surface leveling by GPS has proposed as the primary method for measuring subsidence in Mashhad. But this is costly and time consuming. InSAR interferometry (InSAR) can be an alternative means to obtain measurements of the surface displacement providing better resolution and comparable accuracy while being less time consuming. In this paper, InSAR technique is proposed to study ground deformation. The feasibility and reliability of using this technique with relatively few acquisitions and in a tropical location for deformation estimation is also investigated.

کلید واژه ها: خراسان رضوى