Incorporation of Channel Losses in the Geomorphologic IUH
The infiltration losses along the stream channels of a basin are included into the Instantaneous Unit Hydrograph (IUH). The IUH is derived as a function of the basin geomorphological and physiographic characteristics, and the response of the individual channels to upstream and lateral inflows. This response is obtained by solving the linearized continuity and momentum equations, including approximate infiltration losses terms, for the boundary conditions established by the definition of a linear system response to an instantaneous unit input. A methodology is proposed for the estimation of the parameters involved in the channel response. Based on this result, a procedure is suggested to include infiltration losses in the common linear reservoir representation of channel segments. Comparisons indicate that this approximation is adequate under certain conditions.
For the first time channel infiltration is explicitly included in an analytical physically based linear model of channel response potentially useful in traditional hydraulic routing problems.
KeywordsProbability Density Function Froude Number Scale Problem Water Resource Research Cumulative Density Function
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