What question did this study set out to answer?

To examine the physical mechanisms causing loss of human stability in flood flows and evaluate safety thresholds across varying water depths and velocities.

October 1, 2008JAWRA Journal of the American Water Resources Association

Human Instability in Flood Flows 1

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Authors

SJSebastiaan N. JonkmanTexas A&M University at Galveston EPEdmund C. Penning‐RowsellScience Oxford

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Implication

Experimental study reveals friction instability during shallow high-velocity flood flows in humans, indicating that current safety guidelines underestimate drowning hazards.

Key Points

To examine the physical mechanisms causing loss of human stability in flood flows and evaluate safety thresholds across varying water depths and velocities.
Reviewed historical experimental literature regarding human balance and instability thresholds in flowing water.
Conducted physical hydrodynamic experiments through the Flood Hazard Research Centre across different combinations of water depth and flow velocity.
Analyzed experimental failure modes against analytical models representing moment instability (toppling) and friction instability (sliding).
Low-depth, high-velocity flood flows induced human instability at substantially lower thresholds than previous experiments indicated.
Loss of human balance in shallow, rapid flows resulted primarily from friction instability (sliding) rather than moment instability (toppling).
Friction instability initiated earlier than moment instability under high-velocity conditions, demonstrating that existing flood hazard assessments require downward revisions of safe velocity limits.

Cite This Study

Jonkman et al. (2008) studied this question.

synapsesocial.com/papers/6a12c3a15bb7edc7189e401d https://doi.org/10.1111/j.1752-1688.2008.00217.x

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Implication

Experimental study reveals friction instability during shallow high-velocity flood flows in humans, indicating that current safety guidelines underestimate drowning hazards.

Human Instability in Flood Flows 1

Discussion

Member takes

Implication

Key Points

Cite This Study

Human Instability in Flood Flows 1

Discussion

Member takes

Implication

Key Points

Cite This Study

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