| Title |
Numerical Simulations of Developing Mining Pit using Quasi-Steady Model |
| Authors |
최성욱(Choi, Sung-Uk) ; 최성욱(Choi, Seongwook) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1B.053 |
| Keywords |
준설 웅덩이;준정류 모형;유사이동;총유사량;하도형태 mining pit;quasi-steady model;sediment transport;total load;stream morphology |
| Abstract |
This study presents a numerical model that is capable of simulating the evolution of mining pit in a stream. The numerical model is based on the quasi-steady assumption that the flow is steady with time-dependent morphological change. This hypothesis is valid due to the fact that the stream morphology changes over a long period compared with the time of flow change. Before applications, numerical experiments are carried out with two total load formulas such as Engelund and Hansen's (1967) and Ackers and White's (1973). It is found that the use of Engelund and Hansen's formula reproduces evolution of mining pit best compared with simulated profiles in Parker (2004). Then, the model is applied to two laboratory experiments in the literature. In general, the numerical model simulates properly the evolution of mining pit in laboratory open-channels. However, it is found that the model does not reproduce head-cutting, propagating upstream, and under-estimates the wave of the bed, propagating downstream, after finishing the re-fill of the mining pit. |