Hydrodynamic characteristics in non-uniform channels | |
| Author | Luo, Ching-ruey |
| Call Number | AIT Diss. no. WA-93-01 |
| Subject(s) | Hydrodynamics Channels (Hydraulic engineering) |
| Note | A Dissertation submitted in partial fulfillment of the requirement for the Degree of Doctor of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. WA-93-01 |
| Abstract | The two dimensional free-surface open channel flows in non-uniform channels, such as convergent and divergent channels, abruptly varied channel with and without hydraulic jumps, and compound-channel are typical and common ones. However, informations on their hydrodynamic characteristics are not explicitly available. The analytical method is considered to solve the hydrodynamic quantities. The profiles of velocity and turbulent shear stress are firstly determined, which are then used to derive the profiles of turbulent eddy viscosity and dispersion coefficient in order to correlate hydrodynamics with sedimentation. The turbulent kinetic energy is derived from equations of motion, which is then used to determine the energy dissipation rate. The analytical method yields reasonable results and has wide applicability. The analytical solutions of the free surface turbulent flow in non-uniform channels, are derived for two-dimensional horizontal-plane with depth-averaged flows, twodimensional vertical-plane with width-averaged flows, and two-dimensional compoundchannel flows. The comparisons of single-section open channel flows are done among the analytical 2-DH and 2-DV results, experimental data and numerical modelings, namely TEACH and VEST with standard parameters; while some experimental results used for comparing the compound channel flows. Analytical results give wide range of validity after comparing the quantity results and the clear explanations for describing the quality developments and expressions are also obtained. In analogy to the molecular diffusion coefficient, the dispersion coefficient, which is derived from the velocity profile and turbulent viscosity, has already implied the relationship between hydrodynamics and sedimentation. The analytically hydrodynamic results also are applied to the real-field applications to predict the distributions of those hydrodynamic quantities and implication of sedimentation in the flow field. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. WA-93-01 |
| Type | Dissertation |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Suphat Vongvisessomjai; |
| Examination Committee(s) | Gupta, Ashim Das;Tawatchai Tingsanchali;Loof, Rainer;Worsak Kanok-Nukulchai;Tamai, Nobuyuki; |
| Scholarship Donor(s) | The Government of Japan.; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1993 |