Using 3D printing in a Problem-Based Learning approach about fissured rock hydraulics

Fissured Rock Hydraulics is a crucial aspect of hydrogeological and geophysical education. It is highly relevant in fields such as water management, rock stability, and reservoir engineering. However, teaching this topic presents challenges due to the distinct features of fractures compared to porous media, the scale-dependence of processes like dispersion, and the natural heterogeneity of the systems involved. These factors can make it difficult for students to grasp the concepts fully.

This contribution uses a Problem-Based Learning approach to demonstrate how 3D printing can enhance the teaching of fracture flow. In this approach, student groups were tasked with designing experimental setups to showcase various fracture flow features. The resulting setups were then used in combination with video recordings to highlight specific processes and effects. This work presents solutions for:

• Solute transport along a fracture profile
• Macroscopic dispersion in a fracture network
• Flow channeling along a rough fracture surface

Finally, this contribution reflects on the learning outcomes and provides links to the developed methods for easy adaptation in other courses.