Abstract
This paper proposes nondimensional unit hydrograph (UH)-based procedure for eliminating the oscillations frequently observed in the recession part of altered duration UHs derived from conventional S-curve approach. Such occurrence of oscillations and/or even negative ordinates cannot be ignored or left unadjusted, and therefore, their elimination by often suggested manual/visual adjustments is attempted, which is quite cumbersome and time-consuming. Proposed procedure employs the peak (Q p ) and time to peak (t p ) of altered duration (τ-h) UH for its derivation, which is derived by using analytical S-shaped model-efficient enough to exactly reproduce the oscillation-free S-curve. The suggested approach is found to be superior to the conventional S-curve approach. On the whole, the complexity associated with the lagging of S-curve, interpolation—if altered UH duration is not a multiple of parent UH duration (D-h), manual/visual adjustments to eliminate oscillations in derived S-curve or altered duration UHs and also for reasons of maintaining unit volume of UH has been fully resolved.
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Patil, P.R., Mishra, S.K., Sharma, N., Singh, V.P. (2018). Nondimensional UH-Based Smoothing of S-Curve-Derived UH Oscillations. In: Singh, V., Yadav, S., Yadava, R. (eds) Hydrologic Modeling. Water Science and Technology Library, vol 81. Springer, Singapore. https://doi.org/10.1007/978-981-10-5801-1_42
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