Human Resilience & CBRN

NATO DIANA · Human Resilience & Biotech — CBRN hazard prediction & operator crew-endurance.

CBRN dispersion · Gaussian plume

Source rate50 g/s

Wind speed3 m/s

Release height0 m

Hazard threshold1 mg/m³

Atmospheric stability (Pasquill)

Hazard dist 1450 mFootprint 0.19 km²Peak 1803.5 mg/m³

Shaded area = real threshold isopleth (concentration ≥ hazard threshold). A→F runs unstable→stable.

Operator endurance · two-process model

82effectiveness

LOW fatigue risk

Hours awake8 h

Sleep last 24h7.5 h

Time of day14 h

Workload0.5

RT 307 ms Alert 85Err risk 18%

Fit for duty; maintain normal watch rotation.

CBRN uses the continuous-point-source Gaussian plume with Pasquill-Gifford (Briggs rural) σ-coefficients; the shaded region is the true isopleth where ground-level concentration meets the hazard threshold, giving the downwind hazard distance and protective-action corridor. Operator endurance combines a homeostatic sleep-pressure process (rising with hours awake, paid down by sleep) with a circadian process (evening peak, ~05:00 trough) to a cognitive-effectiveness score, reaction-time and error-risk estimate. Both support protective-action / rest decisions only.