Flow time estimation with spatially variable hillslope velocity in ungauged basins |
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Authors: | Salvatore Grimaldi Andrea Petroselli Gustavo Alonso Fernando Nardi |
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Affiliation: | 1. Department of Geology and Mechanical Engineering, Bioengineering and Hydraulics for the Territory (GEMINI), University of Tuscia, Via S. Camillo de Lellis snc, 01100, Viterbo, Italy;2. Honors Center of Italian Universities (H2CU), University of Rome La Sapienza, Via Eudossiana 18, 00184 Rome, Italy;3. Agrophysics Research Unit. Agrarian University of Havana, San José de las Lajas, La Habana, Cuba |
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Abstract: | The automated spatial estimation of the hillslope runoff dynamics is used as a valuable tool for the estimation of the travel time distribution (flow time), a major factor for the hydrologic prediction in ungauged basins. In fact, while the flow time function is usually obtained by rescaling the flow paths with constant channel and hillslope velocities, in this work a spatially distributed kinematic component, as a function of terrain features and in particular slope and land use, is implemented and its influence on the hydrologic response is tested by means of the Width Function Instantaneous Unit Hydrograph (WFIUH) framework. Hillslope surface flow velocities are evaluated by applying different uniform flow formulas within an automated DEM-based (terrain analysis) algorithm. A comparison test of the performances of the Manning, Darcy, Maidment and Soil Conservation Service uniform flow equations is performed for several case studies in Italy pertaining to different climatic and geomorphic conditions. Results provide new insights for a better understanding of the flow time function also introducing a more parsimonious and physically-based calibration scheme of the WFIUH. |
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Keywords: | Ungauged basin Unit hydrograph Terrain analysis DEM Width function Hillslope hydrology |
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