RESISTANCE COMPUTATION IN OVERBANK FLOWS
There is a recognized need for a reliable method of determining the stage discharge curve for compound channels, of which a closely studied example is the floodplainchannel-floodplain combinations of the type investigated by the UK Flood Channel Facility (FCF). This paper re-analyses the coherence approach to use subsection weighting based on area instead of perimeter. According to textbook analysis of channel conveyance, this corresponds with the weighting of the local driving gradients balanced by the whole-section friction slope, so avoiding unrepresentative overweighting of floodplain subsections in areas which are barely inundated. The reanalysis leads to a general treatment which is verified within a tolerance of well under 5% by reference to FCF resuits. Practicalities of model implementation are discussed for a general-purpose compound channel model, and result validations from the A ULOS hydraulic design software package are presented.
overbank flow flood plain coherence compound channel conveyance
Alastair G.Barnett Asaad Y.Shamseldin
HYDRA Software Ltd, PO Box 9463, Hamilton, New Zealand University of Aucldand, Private Bag 92019, Auckland, New Zealand
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1829-1834
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）