Decay factors used for the solute concentrations

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Nguyen Anh Thao Ngo

• June 03, 2024 06:41
• Edited

Hi all,

Could you please advise how to do use the decay factors for the solute concentrations of a particular source of water flow?

I want to apply the decay factors for the seepage concentration only, and decay factors were linearly interpolated in between simulation years (for example, year 0-50, decay factor for Calcium is 0.5, year 50-100, decay factor for Calcium is 0.125, year 100-200, decay factor for Calcium is 0.0625 and so on). 

While there are no decay factors applied for the other water source concentration (groundwater, runoff).

Hope you can help. Thanks.

Regards,

Thao

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• Official comment

  

  Rick Kossik

  • June 03, 2024 18:51

  Can you be more specific by what you mean by "decay factor"?  

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  Nguyen Anh Thao Ngo

  • June 03, 2024 23:38
  • Edited

  Thanks for your response Rick.

  I have 4 inflows of surface runoff, spoil runoff, spoil seepage and ground water to the pit. While surface runoff, groundwater inflows were assumed to supplying salts to the pit at a constant concentration for the duration of the simulation, the salts from spoil seepage source would be decline over time.

  So I want to apply decay factor (from 1.0 to 0.0625) or decay rate of salt species (λ = ln(2)/Half-life) to represent the effects of decline in salts over time for spoil seepage ONLY.

  I set the zero half-life indicates that the salt species does not decay at all in "Species". As I understand, if I set decay rate here, that mean it is applied for all inflows. I aim to set decay rate for only 1 spoil seepage inflow.

  Hope you can help.

  Regards,

  Thao

  

  

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  Rick Kossik

  • June 03, 2024 23:42

  Do you want to decay the source term, or actually decay the species, as if it is reacting?

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  Nguyen Anh Thao Ngo

  • June 03, 2024 23:47

  Hi Rick,

  Thank you for responding so quickly. I think to decay the source term for this case.

  Cheers,

  Thao

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  Rick Kossik

  • June 03, 2024 23:56

  Then simply specify the Mass Input rate as a function (either analytical or using a lookup table).

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  Nguyen Anh Thao Ngo

  • June 04, 2024 01:06

  I see. Many thanks Rick for your advice.

  Regards,

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