| Title |
A Study on Controlling Efflux Sediment Diffusion by Jetty Construction at Small Estuary |
| Keywords |
prediction of sediment diffusion;concentration of sediment;small estuary;jetties;distribution of field sediment concentration;토사확산예측;토사농도;소규모 하구;도류제;현장농도 분포 |
| Abstract |
In this study, a jetty construction is taken into account for the reduction of sediment diffusive concentration incoming from the upstream river due to the urbanization and industrial development and to minimize the effects on the coastal ecosystems. The field observation and numerical calculation are conducted to analyze the diffusion zone of sediment concentration in the small estuary and coastal area. The specification of the installed jetty which is able to control the sediment concentration was decided based on the prediction of the dispersion area changes in space and time. The selected size and layout for the jetty design were examined for the dispersion zone by numerical calculation and field observation. As a result, the jetties constructed in the estuary retarded the dispersion rate of sediment concentration, so that the effect area of sediment dispersion was obviously decreased. In addition, the measured field data indicated that the sediment deposition in the inside of dikes could be controlled and the right side area of jetties could be preserved without influx sediment diffusion. |