Impacts of raindrops increase particle sedimentation in a sheet flow

Interrill erosion is driven by raindrops and sheet flow. Raindrop impacts cause sediment detachment splash, but can also affect flow transport. Even if these processes have been studied for long, the actual effect of raindrop on particle settling velocities has not experimentally assessed. This leads to unconstrained adjustments in soil models, velocity particles being a freely adjustable parameter allowing better fitting flux measured at outlet. To address flow, laboratory flume experiment was designed, using an upstream feeder (100–200 μm) simulated rainfalls. It reproduced conditions close while from bottom. Two series experiments were run: with high rainfall intensity (175 mm/h) generated oscillating-nozzle simulator, lower intensities (10, 15, 25, 35, 55 drop-former simulator. When applied, it systematically decreased concentration outflow compared no rain condition; however, obvious relationship found intensity. shows that increase underlying mechanisms are suggested, related momentum or turbulence caused into Further studies should be carried out, computational fluid dynamics collaboration mechanics community.