A multilinear discrete Nash-cascade model for stage-hydrograph routing in compound river channels |
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Authors: | Bhabagrahi Sahoo Muthiah Perumal Tommaso Moramarco Silvia Barbetta Soumyaranjan Sahoo |
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Institution: | 1. School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, Indiabsahoo2003@yahoo.com https://orcid.org/0000-0003-4226-0815;3. Department of Hydrology, Indian Institute of Technology Roorkee, Roorkee, India;4. National Research Council, Research Institute for Geo-Hydrological Protection (Istituto di Ricerca per la Protezione Idrogeologica - IRPI), Perugia, Italy https://orcid.org/0000-0002-9870-1694;5. National Research Council, Research Institute for Geo-Hydrological Protection (Istituto di Ricerca per la Protezione Idrogeologica - IRPI), Perugia, Italy https://orcid.org/0000-0002-3221-3209;6. School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, India https://orcid.org/0000-0001-6735-1970 |
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Abstract: | ABSTRACTStream gauge-based information is the foundation for many hydrological applications in a river basin including the aquatic-habitat conservation. A simple two-parameter model for routing streamflow depth (alternatively, stream–stage) hydrographs and estimating corresponding discharge hydrographs in river channels is proposed using the multilinear approach, based on Nash-type discrete-cascade model. The applicability of this model is investigated by extending its framework to the realm of compound cross-section trapezoidal channels for both in-bank and overbank flows by using 20 flood events of the Tiber River in the Umbria region of Central Italy, and subsequently comparing the simulated results with the corresponding simulations of the HEC-RAS (Hydrologic Engineering Center – River Analysis System) hydrodynamic model and observed flow depth hydrographs. The field application, comparative study, and uncertainty and sensitivity analysis of the results demonstrate that the proposed multilinear discrete Nash-cascade stage-hydrograph (MDNS) routing model has the potential for routing floods in real-world rivers and canal irrigation systems, especially in operational mode. |
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Keywords: | floods flood routing multilinear discrete-cascade rivers and streams stage routing unsteady flow |
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