The study attempts to explain flood wave propagation in natural and artificial channels within the perspective of site-specific rating curve. The study looks at the impacts of channel characteristics – bed slope, flood plains, channel shape, expansion-contraction combination, inactive storage, Manning’s roughness, expansion and contraction on flood wave propagation.
Describing flood wave propagation in open channel flow within the framework of loop or hysteresis of rating curves has not received much attention though frequent attempts have been made time and again. The literature on the subject has been more intuitive than rational. The available knowledge is limited to these aspects –
The study attempts to do the following -
The analytically derived relationship between quantified hysteresis and phase difference is verified using the available numerically derived and observed data. Also for kinematic wave situation, a unique relationship among hysteresis, phase difference and logarithmic decrement is presented. The shifting control situations also causes hysteresis in the rating curves but is however, beyond the scope of the present report.
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