Sediment transport time series in the Tiber River |
| |
| Authors: | Carla Iadanza Francesco Napolitano |
| |
| Institution: | a APAT - Italian Agency for the Environment Protection and Technical Services, Department of Land Resources and Soil Protection, Geological Survey of Italy, Via Curtatone, 3, 00185 Rome, Italy
b University of Rome La Sapienza, Department of Hydraulic, Transportation and Highways, Via Eudossiana, 18, 00184 Rome, Italy |
| |
| Abstract: | The hydrologic regime of the Tiber River basin in central Italy has been impacted considerably in the last decades by intensive anthropic activities, and hydraulic works in particular (e.g. hydropower reservoirs, land use modification). In the Tiber River the wash load, in particular, plays an important role in sediment transport, and the knowledge of this hydrological variable is very important for the evaluation of medium-long-term dynamic of shoreline, and the evaluation of reservoir landfill. The Ripetta flow gauge, located in downtown Rome, has been continuously monitoring the daily discharge for decades, while daily sediment load measurements are available only for short terms.In this research, the yearly sediment rate is simulated using a simple stochastic model based on the evaluation of sediment rating curves. The sediment rating curve, i.e. the average relation between discharge and suspended sediment concentration for a specific location, is estimated using a power law model. The fitting curve, obtained by regression analysis, lacks the physical characterization of the phenomenon, often represented by the empirical evidences of erosion severity and the erosional power of river. Model results provide useful insights on the impact of recent hydraulic works on the sediment transport regime. |
| |
| Keywords: | Tiber River Sediment transport Suspension material Modelling |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
