Abstract
The River Bandon is located west of Cork City in the South Western River Basin District with a catchment area of 608km2. The town of Bandon, the largest urban settlement within the river catchment, has a history of flooding with significant river improvement works planned for the summers of 2015 and 2016. A one dimensional hydrological software modelling package, HEC-RAS, has been applied to the river system as part ofthe overall river improvement project. The model simulates hydraulic and sediment transport conditions on the river and covers a 10.5km stretch of the river with 239 cross -sections from upstream of the town of Bandon to approximately 6.5km downstream. The model includes the river's main tributaries (Bridewell, Millstream and Brinny) and various river structures. Calibration of the hydraulics of the model was undertaken for both in-bank and out of bank flow at the two hydrometric stations located within the model boundary. Satisfactory water level calibration was achieved by adjusting the Manning roughness coefficient to produce the lowest root mean square error for flows ranging from 148m3/sec to 330m3/sec (return periods of 2 to 100 years respectively using the Emoments approach) yielding RMSE= 0.085, E=0.993 and BE=-0.024. The hydraulic model was successfully validated using river flows for the calendar year of 2010 (with Bows ranging from 2.97m3/sec to 172.6m3/sec yielding RMSE=0.066, E=0.95 and BE=-0.63). Calibration of sediment conditions in the model has involved the analysis of the field suspended sediment concentration data at a measurement sensor on the river. The HEC-RAS model is being used to assess sediment transport rates and potential bed level change in the river. The model will also be applied to simulate the potential sediment transport impacts of the river improvement works on the river system.
Disciplines
Civil and Environmental Engineering | Engineering
Full Publication Date
October 2015
Publisher
Cork Institute of Technology
Resource Type
conference object
Access Rights
restricted access
Recommended Citation
Gamble, J., ‘Sediment Transport Modelling on the River Bandon’, Research Seminar Series, School of Building and Civil Engineering, Cork Institute of Technology, October 2015.
Publication Details
Presented at the Research Seminar Series, School of Building and Civil Engineering, Cork Institute of Technology, October 2015.
Abstract only.