Integration of UAV Photogrammetry and SPH Modelling of Fluids to Study Runoff on Real Terrains

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.

Drones as a tool to monitor human impacts and vegetation changes in parks and protected areas

“…), water runoff analyses (Barreiro et al. ) trash and wildlife cues. We have demonstrated that detailed surveys to map protected areas and measure trail conditions, trampling and effects on vegetation as a consequence of human use can be performed with high spatial and temporal resolution with minimal technical expertise required.…”

“…Even more, drones can be used to assess water runoff (Barreiro et al. ), erosion (Ćwiąkała et al. ) and a wide range of management relevant landscape parameters (Anderson and Gaston ).…”

“…Our study showed that drones, together with photogrammetric tools, can provide park and protected area managers with reliable tools to monitor recreational impacts in a non-intrusive and efficient manner. Drones can provide measurements of trail parameters, such as width, depth and informal trail proliferation, but also more complex measurements such as vegetation change, soil loss due to erosion or landslides (Turner et al 2015), water runoff analyses (Barreiro et al 2014) trash and wildlife cues. We have demonstrated that detailed surveys to map protected areas and measure trail conditions, trampling and effects on vegetation as a consequence of human use can be performed with high spatial and temporal resolution with minimal technical expertise required.…”

“…Time series of vegetation classification done in GIS can help managers identify areas with significant changes in vegetation composition as a result of human or wildlife pressure, and enforce management actions accordingly. Even more, drones can be used to assess water runoff (Barreiro et al 2014), erosion ( Cwia z kała et al 2017) and a wide range of management relevant landscape parameters (Anderson and Gaston 2013). In summary, drones provide a new toolset for the management of parks and protected areas by applying GIS tools to the drone-derived images.…”

A Meshless WCSPH Boundary Treatment for Open‐Channel Flow over Small‐Scale Rough Bed

“…e ghost particle velocity is thought to be only related to water depth and roughness height but independent of the slope of the bed surface. Similar to the second approach [27,28], Barreiro et al [29] modified the artificial viscosity value for interactions between fluid and bottom to mimic the Manning roughness coefficient of vegetation [26]. However, there is still no universal roughness boundary of free surface flow in the current SPH framework for different flow patterns such as hydraulic smooth flow, hydraulic rough flow, or hydraulic transition flow.…”