The study of land subsidence in Tehran plain and its casual factors
|Location||The 24 Symposium of Geosciences|
|Author||Amir Shemshaki , Mohammad Javad Boulourchi , Iman Entezam Soltani|
|Holding Date||18 August 2007|
The surface leveling investigations and data available from InSAR studies reveal land subsidence occurrence in an area of 400 km around South and South West of Tehran. The rate of subsidence in this area is estimated to be around 3-16cm per year. In field studies one of the best evidence regarding this phenomenon was well head protrusion that observed in many parts of the area. Further studies reveal a direct relation between the subsidence phenomenon, lowering of pizometric level and thickness of fine grain deposits (mainly clayey) in the area.
The main methods of controlling the rate of subsidence in short term are reducing the ground water and stopping the sand and gravel mining in upper part and in subsidence area. In fact without a long term water management program, stopping the subsidence in the area is impossible. In this direction preparing highly accurate water balance and definition of accurate geological and hydrogeological boundaries are necessary.