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Numerical Modellimg of Land Subsidence by Considering the Combined Effects of Water Exploitation and Climate Change

Mirpanji, Amir Reza | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56461 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadeghi, Hamed
  7. Abstract:
  8. This study develops a new framework for the assessment of land subsidence occurrence rate. The proposed framework considers the combined effects of saturated and unsaturated soil behavior. Accordingly, the biot consolidation theory was used for investigating subsidence in the saturated zone while the soil shrinkage curve, i.e., the void ratio-suction curve, was used in the determination of unsaturated zone subsidence. Specifically, groundwater decline and land climate change were used as the main contributing factor in investigating the land subsidence in the saturated and unsaturated zone, respectively. The approach presented in this study is based on using numerical modeling in PLAXIS 2D software and coding in the Python interpreter environment. The former is used for modeling the land subsidence in the saturated zone while the latter is used for the unsaturated zone. Considering the unsaturated zone, the simulation started from the hydrostatic condition, and the suction profiles determined at the end of each year were used as the initial boundary condition for the next year's analysis. Thus the variation in soil suction is transformed into unsaturated subsidence using the shrinkage curve. The numerical result in this study is supported and validated by the InSAR time series analysis. Results indicate that neglecting the effect of unsaturated zone leads to underestimating the land subsidence rate, especially in regions with an arid climate
  9. Keywords:
  10. Land Subsidence ; Climate Change ; Surface Evaporation ; Soil Shrinkage ; Remote Sensing

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