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Investigating Wind-Induced Currents in Sloped Aquatic Canopy Areas

Tohidi, Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42921 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. Aquatic canopy zones play an important role in maintenance of ecosystems. These areas are ubiquitous near rivers, lakes, lagoons, estuaries and shore lines. Governing dynamical systems through these areas have direct influence on, how nutrients and other vital materials for living things disperse. Also, they can control the amount of dissolved oxygen within the body of water in these regions. Nowadays, investigating the effects of vegetation grabbed the attention of many scientists and is a very important burgeoning field. In this study, the effects of surface cooling which resulting from mild wind blow have been investigated. In fact, two type of different currents form when wind blows parallel to the shore lines. One is called advection current which is in the wind direction and resulting form wind shear stress over the surface of water and the other is called free convective currents which are transverse to the advection currents. Presence of vegetation strongly controls the hydrodynamic characteristics of these currents. To investigate these effects and capture flow pattern within these areas, numerical and experimental modeling have been employed. Our results show that wind-induced currents have the same velocity magnitude as well as phenomena like thermally driven exchange flows which induce by non-uniform solar radiation. In addition, we showed that the drag dominated regime has limited time span and the flow regime changes as it goes up slope. This result has not been documented before. Moreover, the significant effects of slope on gravity currents have been shown by our numerical results which they have been verified by experimental findings. To conclude, we should mention that the flow pattern and governing dynamical processes within the aquatic canopy zones are very complex and the effects of all phenomena should be considered together.

  9. Keywords:
  10. Wind Blowing ; Exchange Flow ; Numerical Modeling ; Experimental Modeling

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