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Investigation of Ardabil Plain Subsidence with Respect to Changes in Groundwater Level and Climate Fluctuations

Fazel Mojtahedi, Farid | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49608 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khosravi, Ali
  7. Abstract:
  8. The subsidence phenomenon in the past years has caused many problems and issues for the agricultural lands, roads, power transmission lines, energy etc., due to different reasons including over use of groundwater resources and changes in climate. This phenomenon has been observed in different plains of the country including the Khorasan, Kerman, Hamedan, Ghazvin and Isfahan plains and has caused many damages to infrastructure and agricultural products in the mentioned regions. In this research the main factors which have affected the subsidence phenomenon especially reduced ground water table and climate changes in Ardebil plain, are taken into account and some studies which comprise collection and investigation of obtained data from the land structure, conditions of the surface and ground waters, soil properties and measurement of settlement in the region have been performed. Over use of ground water resources and intense climate changes (unprecedented drought in recent years) not only would cause change in the ground water level in the region but also would cause change in the soil condition and increase in the thickness of unsaturated soil layer in the study area. These changes would induce significant subsidence in the region where its accurate calculation and estimation requires knowledge and utilization of governing principles concerning unsaturated soils. In this study based on the field observations in Ardebil plain, and performed field and laboratory experiments and numerical analyses, attempt is made to estimate subsidence at different times of the year (in the past and present) and finally make comparison with the obtained values for subsidence through satellite images
  9. Keywords:
  10. Unsaturated Soil ; Numerical Analysis ; Satellite Imagery ; Groundwater Level Prediction ; Climate Change ; Subsidence Phenomenon ; Ardebil Plain

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