Sediment control device for offshore tin mining | |
| Author | Prasong Vuttisirisart |
| Call Number | AIT Thesis no.WA-85-55 |
| Subject(s) | Tin mines and mining Sediment control |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Submarine outfall disposal of Tin mining process is a method of steadily growing importance. the flow an ocean outfall is essentially that of a submerged vertical jet. Thus a study of the hydrodynamics of such jet is needed to evaluated the dilution of the sewage flow. An experimental study of dense fluid discharged under water surface is conducted. Of interest is the design of sediment control device used for greatly reduction the turbidity by minimizing the entrainment and mixing, and mostly discharging the dredged material near the bottom field. Three shapes of sediment control device are used for attaching to the end of slurry discharge pipe, a vertical plain pipe, a conical diffuser and a modified diffuser are used to evaluate the sediment concentration profile, mud height and mud velocity. The study is carried out in three cases i.e. in steady uniform flowing case, in quiescent state and slurry discharged at water surface level. The experiments are performed in a laboratory flume in which a single dense jet issued vertically downward cross the flow direction, by varying variables i.e. discharge height, initial concentration, ambient flow velocity, pipe diameter and discharge rate. It is found that the sediment dilution and transportation under the water surface can be treated in three zones namely; the jet zone, the dispersion zone and the diffusion Zone. Empirical equations for predicting the sediment dilution and dispersion in these three zones are obtained. The submerged vertical plain pipe is recommended as a better design shape for controlling the turbidity occurred from discharging the dredged material into the sea water and the design procedure is presented to give a predictive criteria for full scale tests. |
| Year | 1985 |
| 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) | Prida Thimakorn |
| Examination Committee(s) | Suphat Vongvisessomjai ;Wang, Tsan-Wen |
| Scholarship Donor(s) | The Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1985 |