| Title |
Sediment Transport Characteristics in a Pressure Pipeline |
| Keywords |
sewer design;sediment transport;pressure line;sediment loads;sediment waves;deposition;원형 배수관로;압력관로 내 토사이송;유사이송 형태;유사이송 지배인자 |
| Abstract |
The low carrying capacity caused by the deposition in a sewer line is one of the main reason of the urban flood. Therefore, an efficient maintenance and management of the storm water drainage system is very important to prevent urban flood. In this research, the sediment transport characteristics through a pressure pipeline were examined with laboratory experiments. Bed-forms in a pipeline, sediment rates, roughness due to sediments were examined. Experimental system consists of flow circulation system with a pump and a sediment feeder at the upstream of the pipeline. Sediments were supplied into a 60 ㎜-diameter and 8 m-Iong pipe. Maximum flow rate is 30 ㎥/hr, and the sediment feeding rate range is 5 g/s~19 g/s. Governing parameters and estimation equation for sediment transport rate were developed. The mean velocity (U), coefficient of viscosity (μ), unit width bed load (q<SUB>b</SUB>), mean diameter of particle (d??), unit weight of sediment in water (r’<SUB>s</SUB>) were adopted as the most influencing factors of sediment transport patterns. The prediction equation for sediment transport rate were developed with two dimensionless terms. These two dimensionless terms showed a linear relationship with high correlation coefficient. |