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Integration of UAV photogrammetry and SPH modelling of fluids to study runoff on real terrains.

Barreiro A, Domínguez JM, C Crespo AJ, González-Jorge H, Roca D, Gómez-Gesteira M - PLoS ONE (2014)

Bottom Line: Roads can experience runoff problems due to the intense rain discharge associated to severe storms.The use of engineering solutions to palliate flood events is also analysed.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.

View Article: PubMed Central - PubMed

Affiliation: EPHYSLAB Environmental Physics Laboratory, Universidade de Vigo, Ourense, Spain.

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.

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Related in: MedlinePlus

Different instants of the DualSPHysics simulation with a ditch 0.8 m deep.Additional detail about the simulation can be found at http://youtu.be/T1po4onk0v4.
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pone-0111031-g009: Different instants of the DualSPHysics simulation with a ditch 0.8 m deep.Additional detail about the simulation can be found at http://youtu.be/T1po4onk0v4.

Mentions: Figure 9 shows the same discharge conditions as previously described for Figure 7. The only difference between both simulations is the presence of a ditch that mimics the main features of the real one shown in Figures 2 and 3; namely, 80 cm deep and 50 cm wide. The first frames are similar to the one in Figure 7. Nevertheless, the rest of the frames show how water is collected and drained by the ditch. Actually, there is not water discharge to the road under these conditions. The computational conditions are similar to the ones described above. The only difference is the maximum number of fluid particles, which is now 2,431,254, since the presence of the ditch increase the residence time of water inside the numerical domain. Consequently, the runtime also increased and it is now 150 hours.


Integration of UAV photogrammetry and SPH modelling of fluids to study runoff on real terrains.

Barreiro A, Domínguez JM, C Crespo AJ, González-Jorge H, Roca D, Gómez-Gesteira M - PLoS ONE (2014)

Different instants of the DualSPHysics simulation with a ditch 0.8 m deep.Additional detail about the simulation can be found at http://youtu.be/T1po4onk0v4.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4220980&req=5

pone-0111031-g009: Different instants of the DualSPHysics simulation with a ditch 0.8 m deep.Additional detail about the simulation can be found at http://youtu.be/T1po4onk0v4.
Mentions: Figure 9 shows the same discharge conditions as previously described for Figure 7. The only difference between both simulations is the presence of a ditch that mimics the main features of the real one shown in Figures 2 and 3; namely, 80 cm deep and 50 cm wide. The first frames are similar to the one in Figure 7. Nevertheless, the rest of the frames show how water is collected and drained by the ditch. Actually, there is not water discharge to the road under these conditions. The computational conditions are similar to the ones described above. The only difference is the maximum number of fluid particles, which is now 2,431,254, since the presence of the ditch increase the residence time of water inside the numerical domain. Consequently, the runtime also increased and it is now 150 hours.

Bottom Line: Roads can experience runoff problems due to the intense rain discharge associated to severe storms.The use of engineering solutions to palliate flood events is also analysed.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.

View Article: PubMed Central - PubMed

Affiliation: EPHYSLAB Environmental Physics Laboratory, Universidade de Vigo, Ourense, Spain.

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.

Show MeSH
Related in: MedlinePlus