In a slowly varying conservative medium, wave action obeys a continuity equation with flux equal to wave-action density times group velocity.

Ancestors (12)

  1. Wave-action density
  2. Whitham modulation equation
  3. Averaged Lagrangian
  4. Whitham modulation theory
  5. Method of multiple scales
  6. Singular perturbation
  7. Ordinary differential equation
  8. Differential equation
  9. Analysis
  10. Area of mathematics
  11. Mathematics
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