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Integration of UAV photogrammetry and SPH modelling of fluids to study runoff on real terrains.
Anxo Barreiro, 1 Higinio Gonzalez-Jorge, 2 David Roca, 2 Moncho Gómez-Gesteira, 1 Alejandro J. C. Crespo, 1 Jose M. Dominguez 1
1  EPHYSLAB Environmental Physics Laboratory, Universidade de Vigo, Ourense, Spain
2  Applied Geotechnology Group. Department of Natural Resources & Environmental Engineering, Universidade de Vigo, Vigo, Spain

Published: 05 November 2014 by Public Library of Science (PLoS) in PLOS ONE
Public Library of Science (PLoS), Volume 9; 10.1371/journal.pone.0111031
Abstract: Roads can experience runoff problems due to the intense rain discharge associated to severe storms. Two advanced tools are combined to analyse the interaction of complex water flows with real terrains. UAV (Unmanned Aerial Vehicle) photogrammetry is employed to obtain accurate topographic information on small areas, typically on the order of a few hectares. The Smoothed Particle Hydrodynamics (SPH) technique is applied by means of the DualSPHysics model to compute the trajectory of the water flow during extreme rain events. The use of engineering solutions to palliate flood events is also analysed. The study case simulates how the collected water can flow into a close road and how precautionary measures can be effective to drain water under extreme conditions. The amount of water arriving at the road is calculated under different protection scenarios and the efficiency of a ditch is observed to decrease when sedimentation reduces its depth.
Keywords: Engineering and technology, fluid flow, Hydrodynamics, kernel functions, rain, Roads, terrain, viscosity
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