5- The velocity of a river flow is measured as and the diffusivity of a water po

Question

5- The velocity of a river flow is measured as and the diffusivity of a water pollutant discharged in the stream is measures as. For a problem with a characteristic length of km, which transport processes should we model (which transport processes among advection and diffusion dominate)? If the same contaminant with the same diffusivity is released into ground water, whose velocity is 0.05 m/day, and characteristic length of the problem being same, which transport processes should we model (which transport processes among advection and diffusion dominate)?

Explanation / Answer

In rivers advection is dominant than diffusion since the it flowing at high velocity give high amount of mixing where as in ground water diffusion is dominant than advection since the the velocity of ground water is very very low compared to river..

Velocity of river >>> velocity of ground water

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