Conference poster presented at the Flow and Transport in Permeable Media Gordon Research Seminar (18–19 July 2026) and Gordon Research Conference (19–24 July 2026), held in Les Diablerets, Switzerland. The poster combines two related studies on transport in rough geological fractures. The first investigates how fracture roughness, preferential flow and conductive exchange with the surrounding rock matrix control thermal breakthrough, spreading and late-time retardation. The second presents a stochastic upscaling framework for anomalous hydrodynamic transport based on velocity intermittency and a reduced continuous-time random-walk model. The work was funded by the European Union under the Marie Skłodowska-Curie grant agreement No. 101111216 (GEONEAT).