Nano-particle transport characteristics with density between stream and subsurface

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Qihao Jiang, Guangqiu Jin, Hongwu Tang

Thursday 2 july 2015

17:48 - 17:51h at Asia (level 0)

Themes: (T) Hydro-environment, (ST) Impacts of pollutants on the water environment, Poster pitches

Parallel session: Poster pitches: 13G. Environment - Impact

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The exchange of nano-particle between stream and subsurface has become very important for the stream ecosystem recovery. We illustrated nano-particle transport characteristics through experiments and numerical simulations. The carbon ink was used as a kind of nano-particle which can ingeniously reveal the nano-particle transport characteristics in the hyporheic zone. A three-dimensional flow and mass transport model with density was used to explore how nano-particle transported in the hyporheic zone. The small density gradient of nano-particle could transport into pore water and most of carbon ink finally released into the river, but the large density gradient of nano-particle will settling on the bottom of streambed. Meanwhile some part of the nano-particle transport in the hyporheic zone would be filtrated in the streambed and a small amount of colloids would be remnant in the hyporheic zone. The results showed that the colloid transport in the hyporheic zone was mainly effected by pore water, settling and filtration.