Author(s): Fatemeh Jafari; Saman Javadi; Neamat Karimi
Linked Author(s):
Keywords: Groundwater Modeling; Subsidence; Radar image; Aquifer-system compaction; Inter bed Storage
Abstract: Subsidence is one of disasters due to groundwater over exploitation. Aquifer compaction and land subsidence accompanying groundwater abstraction in susceptible aquifer systems in the Aliabad plain in the center of Iran is a challenge for managing groundwater resources and provide hazards. Indeed, Subsidence is a permanent and irreversible phenomenon which occurs when groundwater level decrease dramatically. Land subsidence could occur because of groundwater over exploitation as a result of compaction in compressible soil layers. It is important to identify the affected aquifer part and simulate groundwater flow and subsidence conditions in this area. Developments in the assessment of subsidence provide more information to constrain analyses and simulation of aquifer-system compaction. To simulating vertical aquifer compaction, such as those embodied in the aquitard drainage model and the MODFLOW subsidence packages, have proven useful from the perspective of regional groundwater resources assessment. In this research groundwater flow and aquifer compaction is simulated using MODFLOW and SUB package. Used in this research is interferometry technique in Radar imagery in order to measuring subsidence in the area during specific time of simulation. Base on the result, 70cm subsidence occurs during 7 years namely 2003 till 2010. In addition, main subsidence observed in center of plain and also recharge zone of entrance. Base on model prediction this rate will reaches to 150cm in the next five years if the water exploitation remains in stable. The only way to come over this issue would be apply an integrated water management system in this area, which is vital to prevent any further subsidence.
Year: 2015