| Author | Anawat Suppasri |
| Call Number | AIT Thesis no.WM-06-11 |
| Subject(s) | Spillways--Laos--Nam Ngum 2 Dam
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | This research is aimed to check the spillway performance for the Nam Ngum 2 hydroelectric power development project in Lao PDR which is being conducted in AIT. The dam's spillway is composed of a three-bay weir controlled by radial gates and a 430 m long converging chute terminating in a flip bucket with splitters. The general spillway hydraulic model tests with the scale of 1:50 are needed according to design considerations discussed below: The first aerator was completely drowned during a high discharge as a result of its unsuitable geometry. Thus, detailed aerator model with the scale of 1:25 was constructed to improve air entrainment at the first spillway aerator. Ten modifications were adopted and the results were successfully completed by extent aerator's length and add a ramp. The ramp could remarkably help increase air concentration by remaining at least four percent at nearly probable maximum flood (PMF). Existing formulas which are being used to estimate the amount of air entrained by spillway aerator were improved. The, new proposed formula provides more realistic calculation of air entrained discharge by aerator since the ranges of coefficients was reduced. The study of scour development was conducted by using movable bed plunge pool. After a number of trials, the proper mix design was finally found which a semi-cohesive material is composed of sand, cement and water (16: 0.5: 2 by volume). Characteristic of scour in different types of splitter have been studied. This has largely contributed as a design consideration in the modification of flip bucket splitter. Moreover, scour depth formula was established and based on modification of previous research works. |
| Year | 2007 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Clemente, Roberto S.;Sutat Weesakul; |
| Examination Committee(s) | Gupta, Ashim Das;Babel, Mukand Singh; |
| Scholarship Donor(s) | Royal Thai Government (RTG) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |