| Author | Pandey, Ganesh Raj |
| Call Number | AIT Thesis no. WA-88-12 |
| Subject(s) | Weirs--Mathematical models
|
| Note | A thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Numerical analysis of the flow passing through a weir , resting on
pervious foundation of finite depth is obtained for two dimensional steady
state conditions. In case of surface flow passing over the weir, The
analysis has been made for four different flow conditions i . e. high flood
and pond flow conditions with and with out concentration and retrogression
of the flow. For the surface flow conditions, the analysis has been
carried for a known degree of anisotropy and foundation geometry, with
special reference to the Bagmati Barrage in Nepal . Effects of pertinent
components of the structure on the cost are analysed from simulation.
From the analysis it is seen t hat the depth of downstream cutoff
plays a major role in the safety against piping . The vulnerability of
the piping failure increases with the anisotropiness of the foundation.
When the depth of the pervious stratum decreases the exit gradient and
uplift pressure at the downstream end decreases but the risk of failure
increases because of the concentration of the flow lines under the floor.
Storage efficiency of the weir is highly dependent on the length of
impervious floor in t he upstream side . and the depth of the cutoff.
The total cost of the structure is dependent on the depth of the
cutoff in the downstream end and impervious apron in the upstream side.
When the total head loss increases the role of upstream floor increases
from the optimisation point of view. |
| Year | 1988 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Gupta, Ashim Das
|
| Examination Committee(s) | Paudyal, Guna N. ;Loof, Rainer |
| Scholarship Donor(s) | Royal Norwegian Government |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1988 |