Johannes Martin Schneider

• PhD
• Research Associate at Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut

While the demand for electric vehicles (EVs) is continuously growing, safety issues still remain, specifically related to fire hazards. This research aims to improve the resilience of battery systems in EVs by transferring concepts found in biology to a bioinspired battery system. Due to the complexity of modern battery systems, the biological conc...

Shock waves from explosions can cause lethal injuries to humans. Current state-of the-art models for pressure induced lung injuries were typically empirically derived and are only valid for detonations in free-feld conditions. In built-up environments, though, pressure–time histories difer signifcantly from this idealization and not all explosions...

The failure of structural components, e.g. masonry walls, due to accidental or intentional explosions exhibits a considerable risk to the health of persons, operational safety, and surrounding structures. The debris throw originating from overloaded structural elements poses a significant threat to structures and persons in the surrounding environm...

Urban physical security and resilience with respect to accidental and intentional explosive events are an increasing issue regarding civil safety and security of modern societies and their citizens. Examples include industrial on-site explosions, gas explosions or terrorist attacks. In particular, multiple, simultaneous and maliciously time-coordin...

The hazard to persons and structures derived from secondary explosion effects, associated with blast loads on structural components resulting in e.g. debris throw, may exceed the hazard range from the blast wave itself. The debris throw hazard potential is related to the initial fragment throw parameters as launch velocities, angles and masses duri...

Compared to lower-gradient channels, steep mountain streams typically have rougher beds and shallower flow depths, making macro-scale flow resistance (due to, for example, immobile boulders and irregular bedforms) more important as controls on sediment transport. The marked differences in hydraulics, flow resistance, and grain mobility between stee...

Understanding how channel bed morphology affects flow conditions (and vice versa) is important for a wide range of fluvial processes and practical applications. We investigated interactions between bed roughness and flow velocity in a steep, glacier-fed mountain stream (Riedbach, Ct. Valais, Switzerland) with almost flume-like boundary conditions....

In steep mountain streams, macro-roughness elements typically increase both flow energy dissipation and the threshold of motion compared to lower-gradient channels, reducing the part of the flow energy available for bedload transport. Bedload transport models typically take account of these effects either by reducing the acting bed shear stress or...

Bedload transport in steep mountain streams is a key element in the evolution of the landscape, in hydraulic engineering, and natural hazard prediction. Thus a better process understanding of bedload transport and its driving forces is essential for accurate prediction of bedload transport necessary for the dimensioning of hydraulic structures, for...

Bedload transport during storm events is both an agent of geomorphic change and a significant natural hazard in mountain regions. Thus predicting bedload transport is a central challenge in fluvial geomorphology and natural hazard risk assessment. Bedload transport during storm events depends on the width and depth of bed scour, as well as the tran...

[1] Critical Shields values ( ) suitable for specific applications are back-calculated from representative bed load samples in mountain streams and a flow competence/critical flow approach. The general increase of (for the bed D50 size) as well as and (for the bed D16 and D84 sizes) with stream gradient Sx and also the stratification of by relative...

Sediment transport is an important factor in the assessment of natural hazards, but due to the complexity of the systems the predictability is very restricted, especially in mountain rivers. Thus, accurate data from natural streams are essential to assess and develop current approaches. Tracing techniques are widely used to study the processes in s...