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Fine particle deposition and remobilization are two related phenomena that affect hyporheic exchange and groundwater-surface water interaction. In fact, flow between a stream and the groundwater flowing in the subsurface can be hindered or enhanced by the presence or absence of these processes. However, the complex geometry and heterogeneity in natural media represent a hurdle to predict and assess how fine particles behave under different flow conditions. We propose a Particle-Tracking model able to assess the deposition and remobilization of particles taking into account different losing and gaining conditions for the free-surface flow, and different filtration coefficients in the stream bed. The remobilization and filtration phenomena are represented via different velocity profiles and a stochastic filter, respectively. Then, this model is compared with previous experimental data gathered in a recirculating …