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Thermo-Hydro-Mechanical Modeling of Heterogeneous Subsidence in Desiccation-Cracked Clayey Strata Under Soil-Atmosphere Interaction
, M.Sc. Thesis Sharif University of Technology ; Sadeghi, Hamed (Supervisor)
Abstract
Ground subsidence refers to the gradual downward movement of the ground’s surface, often occurring on a large scale due to excessive extraction from aquifers. Nowadays, climatic changes and global warming are fundamental phenomena that can lead to the drying of surface layers of the soil. From a geomechanical and environmental geotechnics perspective, this phenomenon can pose risks such as cracking and increased intensity of ground subsidence. Ground subsidence in cracked soils does not occur uniformly. The rate of subsidence in cracked parts differs from that in uncracked parts. The presence of pathways for increased energy and moisture exchange between the soil and the atmosphere through...
Massively Parallel Algorithms for Geometric Graphs
, M.Sc. Thesis Sharif University of Technology ; Abam, Mohammad Ali (Supervisor)
Abstract
Geometric Spanner is a well-known problem aiming to add some edges between given points to build a graph in which the distance of each two nodes is at most their euclidean distance multiplied by t. One answer for this question can be the complete graph. But we like to use a smaller graph and minimize total edge weights, number of edges, or maximum degree of the graph. We study this problem in the Massively Parallel Computation model. In this model, each machine has not enough space to save all input data. We should divide input into multiple machines and run our algorithm in multiple steps. In each step, each machine computes with only a partition of data. After that, machines share their...
Thermo-hydraulic analysis of desiccation cracked soil strata considering ground temperature and moisture dynamics under the influence of soil-atmosphere interactions
, Article Geomechanics for Energy and the Environment ; Volume 38 , 2024 ; 23523808 (ISSN) ; Sadeghi, H ; Tourchi, S ; Golaghaei Darzi, A ; Sharif University of Technology
2024
Abstract
Global warming and climate change significantly affect ground temperature and flow patterns. Moreover, areas prone to cracking experience intensified temperature and moisture variations. Therefore, the aim of this study is to investigate ground temperature and moisture dynamics considering soil-atmosphere interaction through a coupled thermo-hydraulic analysis. Heat transfer, advective, and non-advective fluxes were simulated using CODE_BRIGHT finite element program to study water flow and energy transfer within the soil. Statistical analyses were conducted using an existing dataset to match the crack geometry with previous studies and find the best distribution for the width-to-depth ratio...
Does the short-term boost of renewable energies guarantee their stable long-term growth? Assessment of the dynamics of feed-in tariff policy
, Article Renewable Energy ; Volume 159 , October , 2020 , Pages 1252-1268 ; Hamed Shakouri, G ; Mashayekhi, A. N ; Kazemi, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Feed-in tariff (FiT) is one of the most efficient ways that many governments throughout the world use to stimulate investment in renewable energies (REs) technology. For governments, financial management of the policy could be challenging as it needs a considerable amount of budget to support RE producers during the long remuneration period. In this paper, it has been illuminated that the early growth of REs capacity could be a temporary boost. And the socio-economic structure of the system will backlash the policy if some social mechanisms are not considered. Social tolerance for paying REs tax and potential investors’ trust emanated from budget-related mechanisms -which have rarely been...