Table ⅡCalibrated parameters for water quality modeling of the Xin’anjiang River

Parameters / Values / Units / Auto-Calibration / Min. Value / Max. Value
Carbon / 40 / gC / No / 30 / 60
Nitrogen / 7.20 / gN / No / 5 / 9
Phosphorus / 1 / gP / No / 0.50 / 2
Dry weight / 100 / gD / No / 100 / 100
Chlorophyll / 1 / gA / No / 0.5 / 2
ISS settling velocity / 0.26 / m·d-1 / Yes / 0 / 2
O2 reaeration model / O’Connor-Dobbins model / No
Slow CBOD hydrolysis rate / 0.21 / d-1 / Yes / 0.05 / 0.25
Slow CBOD oxidation rate / 0.44 / d-1 / Yes / 0 / 5
fast CBOD oxidation rate / 0.56 / d-1 / Yes / 0 / 5
Organic N hydrolysis / 0.23 / d-1 / Yes / 0.05 / 0.3
Organic N settling velocity / 0.9 / m·d-1 / Yes / 0.05 / 2
Ammonium nitrification / 1.00 / d-1 / Yes / 0.05 / 3
Nitrate denitrification / 0.88 / d-1 / Yes / 0 / 2
Sed. Denitrification transfer coeff. / 0.02 / m·d-1 / Yes / 0 / 1
Organic P hydrolysis / 0.05 / d-1 / Yes / 0.05 / 0.3
organic P settling velocity / 0.08 / m·d-1 / Yes / 0.05 / 2
Inorganic P settling velocity / 0.06 / m·d-1 / Yes / 0 / 2
Sed. P oxygen attenuation half sat constant / 1.03 / mgO2·L-1 / Yes / 0 / 2
Detritus dissolution rate / 0.11 / d-1 / Yes / 0.05 / 0.5
Detritus settling velocity / 1.36 / m·d-1 / Yes / 0.05 / 2
COD decay rate / 0 / d-1 / Yes / 0 / 20
COD settling velocity / 0 / m·d-1 / Yes / 0 / 2
Bottom algae
Growth model / Zero-order / Yes
Max growth rate / 135.37 / mg·m-2·d-1 / No / 50 / 200
First-order model carrying capacity / 100 / mg·m-2 / Yes / 50 / 200
Respiration rate / 0.48 / d-1 / Yes / 0.02 / 0.2
Excretion rate / 0.24 / d-1 / Yes / 0 / 0.5
Death rate / 0.06 / d-1 / Yes / 0 / 0.5
External nitrogen half sat constant / 167.16 / μg·L-1 / Yes / 100 / 500
External phosphorus half sat constant / 75.75 / μg·L-1 / Yes / 25 / 100
Inorganic carbon half sat constant / 6.54E-05 / moles·L-1 / Yes / 1.30E-06 / 1.30E-04
Light model / Half saturation
Light constant / 91.80 / langleys·d-1 / Yes / 40 / 110
Ammonia preference / 19.78 / g·L-1 / Yes / 15 / 30
Subsistence quota for nitrogen / 16.05 / mgN·mgA-1 / Yes / 7.20 / 36
Subsistence quota for phosphorus / 168.29 / mgP·mgA-1 / Yes / 1 / 5
Maximum uptake rate for nitrogen / 992.52 / mgN·mgA-1·d-1 / Yes / 350 / 1500
Maximum uptake rate for phosphorus / 168.29 / mgP·mgA-1·d-1 / Yes / 50 / 200
Internal nitrogen half sat ratio / 4.79 / - / Yes / 1.05 / 5
Internal phosphorus half sat ratio / 1.53 / - / Yes / 1.05 / 5