رسالة جامعية
Experimental and numerical study of hydrodynamic oscillations in partially saturated porous media
| العنوان: | Experimental and numerical study of hydrodynamic oscillations in partially saturated porous media |
|---|---|
| المؤلفون: | Wang, Yunli |
| المساهمون: | Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) |
| سنة النشر: | 2010 |
| المجموعة: | OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
| مصطلحات موضوعية: | Groundwater, Sand box, Imbibition, Wave propagation and transmission, Water level oscillations and fluctuations, Porous media, Micro-porous, Macro-porous, Numerical simulation, Plane flow model (Dupuit-Boussinesq), Richards nonlinear 3D model, Partially saturated flow, Sloping sand beach, Signal processing, Multiresolution wavelets, Cross-correlation function, Period, Frequency spectrum, Coherency function, Wave canal, Wave generator |
| الوصف: | This thesis aims at investigating experimentally, analytically and numerically, the consequences of hydrodynamic variations and oscillations with high temporal variability in partially saturated porous media. The problems investigated in this work involve “free surfaces” both outside and inside the porous media, the free surface being defined as the “atmospheric” water pressure isosurface (Pwater = Patm). The laboratory experiments studied in this work are, respectively: Lateral imbibition in a dry sand box with significant capillary effects; Transmission of oscillations of the free surface through a vertical sand box placed in a small wave canal (IMFT, Toulouse); Dynamics of free surface oscillations and wave propagation in a large wave canal (HYDRALAB, Barcelona), partially covered with sand, with measurements of both open water and groundwater levels, and of sand topography (erosion / deposition). For theoretical studies, we have developed linearized analytical solutions. Here is a sample problem that was treated analytically in this work: The linearized equation of Dupuit-Boussinesq (DB) for transient free surface flow, assuming horizontal flow and instantaneous wetting/drainage of the unsaturated zone: forced oscillations, wave transmission and dissipation through a rectangular sandbox. We also developed a weakly nonlinear solution of the Dupuit-Boussinesq equation to study the sudden imbibition (temporal monitoring of the wetting front). We have studied the different types of transient flow problems related to the experiments cited above by numerical simulation. In particular, we have simulated unsaturated or partially saturated transient flows in vertical cross-section, using a computer code (BIGFLOW 3D) which solves a generalized version of Richards’ equation. Thus, using the Richards / BIGFLOW 3D model, we have studied numerically the experiment of unsaturated imbibition in a dry sand (IMFT sandbox), and then, with the same model, we have also studied the partially saturated wave propagation experiment ... |
| نوع الوثيقة: | thesis |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://oatao.univ-toulouse.fr/7057/1/wang.pdfTest; Wang, Yunli. Experimental and numerical study of hydrodynamic oscillations in partially saturated porous media. PhD, Institut National Polytechnique de Toulouse, 2010 |
| الإتاحة: | https://oatao.univ-toulouse.fr/7057Test/ https://oatao.univ-toulouse.fr/7057/1/wang.pdfTest http://ethesis.inp-toulouse.fr/archive/00001484Test/ |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.94E34A66 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |