IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Residual flow modelling: an advance in channel resistance calibration
Residual flow modelling: an advance in channel resistance calibration
Author : A.G. Barnett1 and C. Hellberg2
Resistance calibration conventionally assumes a flow profile along the channel, then seeks to match observed level hydrographs by adjusting parameters such as Manning n values. This takes no account of errors in the assumed flow profiles, even though field measurements of flows are more difficult than those of levels. An improved method concentrates attention on flow errors by virtually eliminating level errors, setting the measured levels as boundary conditions at stub tributaries inserted at every profile measurement point. This method achieves calibration by the analysis of residual model flow discrepancies between successive stations, so it is called “residual flow modelling”. Most of these balancing flows can be matched to runoff from the local subcatchment, leaving minimal flow balance errors. Use of this technique is demonstrated by a sample application in an engineering study requiring precise calibration of flow resistance sensitivity to the planting of riparian vegetation.
File Size : 5,103,398 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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