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Geosyntec / StormPiper

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Change how organics are calculated #51

Closed cnilsen closed 2 years ago

cnilsen commented 2 years ago
austinorr commented 2 years ago

@cnilsen bump

cnilsen commented 2 years ago

This table is from our memo:

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Chemical of concern | Assumed Sediment Potency (mg/kg) | Adjustment for Effluent Concentration* -- | -- | -- Phenanthrene | 1.0 | 1 Pyrene | 1.9 | 1 Di(2-ethylhexyl) phthalate | 19.3 | 2.3** Notes: * Adjustment factors are unitless. When multiplied by sediment potency, the overall units are in mg/kg, or ppm. ** The factor for Di(2-ethylhexyl) phthalate represents the assumed preferential sorption onto more frequently transported particles.

cnilsen commented 2 years ago

And here's how I calculated concentrations in Earth Engine: 

var Phenanthrene = ee.Image.constant(1)
  .rename('phenanthrene_ug_L')
  .multiply(1e-6)
  .multiply(tss)

var Pyrene = ee.Image.constant(1.9)
  .rename('pyrene_ug_L')
  .multiply(1e-6)
  .multiply(tss)

var DEHP = ee.Image.constant(19.3)
  .rename('DEHP')
  .multiply(1e-6)
  .multiply(2.3) //adjustment for preferential sorbtion 
  .multiply(tss)
cnilsen commented 2 years ago

Updated layer is available now: projects/ee-tacoma-watershed/assets/production/coc_concentrations