Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Aquifer and hydro system compaction is a worldwide phenomenon, where there is a sudden sinking or gradual downward settling of the earth's surface with little or no horizontal motion. This phenomenon is noticed to take place in many countries, among which is Iran. Water well casing and installations in areas such as Hamedan , Kerman, Meshhed, Tehran and others seem to rise into the air, or some times to produce fissures in the sediments and/or showing sinkhole in carbonated rocks. Soil compaction and / or land subsidence could cause damages to surface and subsurface urban installations. UNISCO was interesting in this worldwide phenomenon and tried to study it in different countries by work group using GPS, SAR and InSAR techniques that uses radar satellite image. Iran in cooperation with other countries was interesting to see the extension and reasons for Tehran's subaburbs land subsidence by using the new InSAR techniques. The later studies indicated the existence of subsidence areas in north west, south - south west and south east of Tehran with an average soil sink of about 15 cm This subsidence is mostly in a flat area with no special activities except for agriculture and a heavily water well production. Therefore, it is concluded that this sediment compaction is due to depletion of aquifer (i.e. water level drop), which causes aquifer compaction.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Insar Technique to Allocate Land Subsidence in Karaj and Tehran (Shehriar, Waraminand Djadjroud) Areas

San Diego, California

Aquifer and hydro system compaction is a worldwide phenomenon, where there is a sudden sinking or gradual downward settling of the earth's surface with little or no horizontal motion. This phenomenon is noticed to take place in many countries, among which is Iran. Water well casing and installations in areas such as Hamedan , Kerman, Meshhed, Tehran and others seem to rise into the air, or some times to produce fissures in the sediments and/or showing sinkhole in carbonated rocks. Soil compaction and / or land subsidence could cause damages to surface and subsurface urban installations. UNISCO was interesting in this worldwide phenomenon and tried to study it in different countries by work group using GPS, SAR and InSAR techniques that uses radar satellite image. Iran in cooperation with other countries was interesting to see the extension and reasons for Tehran's subaburbs land subsidence by using the new InSAR techniques. The later studies indicated the existence of subsidence areas in north west, south - south west and south east of Tehran with an average soil sink of about 15 cm This subsidence is mostly in a flat area with no special activities except for agriculture and a heavily water well production. Therefore, it is concluded that this sediment compaction is due to depletion of aquifer (i.e. water level drop), which causes aquifer compaction.