nutrients.cha

This file controls the channel nutrient properties.

Field	Description	Type	Unit	Default	Range
name	Name of the channel nutrient record	string	n/a	n/a	n/a
plt_n	Channel organic N concentration	real	ppm	0.0	0.0-100.0
plt_p	Channel organic P concentration	real	ppm	0.0	0.0-100.0
alg_stl	Local algal settling rate in the channel at 20ºC	real	m/day or m/hr	1.0	0.15-1.82
ben_disp	Benthic source rate for dissolved P in the channel at 20ºC	real	mg P/m2*day or mg P/m2*hr	0.05	0.001-0.10
ben_nh3n	Benthic source rate for NH3-N in the channel at 20ºC	real	mg N/m2*day or mg N/m2*hr	0.50	0.0-1.0
ptln_stl	Organic N settling rate in the channel at 20ºC	real	1/day or 1/hr	0.05	0.001-0.1
ptlp_stl	Organic P settling rate in the channel at 20ºC	real	1/day or 1/hr	0.05	0.001-0.10
cst_stl	Arbitrary non-conservative constituent settling rate in the channel at 20ºC	real	1/day	2.50	0.01-10.0
ben_cst	Benthic source rate for arbitrary non-conservative constituents in the channel at 20ºC	real	mg /m^2*day	2.50	0.01-10.0
cbn_bod_co	Carbonaceous biological oxygen demand deoxygenation rate in the channel at 20ºC	real	1/day or 1/hr	1.71	0.02-3.40
air_rt	Reaeration rate in accordance with Fickian diffusion in the channel at 20ºC	real	1/day or 1/hr	50.0	0.0-100.0
cbn_bod_stl	Rate of loss of CBOD due to settling in the channel at 20ºC	real	1/day or 1/hr	0.36	-0.36-0.36
ben_bod	Sediment oxygen demand rate in the channel at 20ºC	real	mg O2/m2*day or mg O2/m2*hr	2.0	0.0-100.0
bact_die	Coliform die-off rate in the channel at 20ºC	real	1/day	2.0	0.05-4.0
cst_decay	Decay rate for arbitrary non-conservative constituents in the channel at 20ºC	real	1/day	1.71	0.0-10.0
nh3n_no2n	Biological oxidation rate of NH3 to NO2 in the channel at 20ºC in well-aerated conditions	real	1/day or 1/hr	0.55	0.10-1.0
no2n_no3n	Biological oxidation rate of NO2 to NO3 in the channel at 20ºC in well-aerated conditions	real	1/day or 1/hr	1.10	0.20-2.0
ptln_nh3n	Hydrolysis rate of organic N to ammonia in the channel at 20ºC	real	1/day or 1/hr	0.21	0.20-0.40
ptlp_solp	Mineralization rate of organic P to dissolved P in the channel at 20ºC	real	1/day or 1/hr	0.35	0.01-0.70
q2e_lt	Qual2E light averaging option	real	n/a	2	1-4
q2e_alg	Qual2E option for calculating the local specific growth rate of algae	integer	n/a	2	1-3
chla_alg	Ratio of chlorophyll-a to algal biomass	real	μg chla/mg alg	50.0	10.0-100.0
alg_n	Fraction of algal biomass that is N	real	mg N/mg alg	0.08	0.07-0.09
alg_p	Fraction of algal biomass that is P	real	mg P/mg alg	0.02	0.01-0.02
alg_o2_prod	Oxygen production rate per unit of algal photosynthesis	real	mg O2/mg alg	1.60	1.40-1.80
alg_o2_resp	Oxygen uptake rate per unit of algae respiration	real	mg O2/mg alg	2.0	1.60-2.30
o2_nh3n	Oxygen uptake rate per unit of NH3-N oxidation	real	mg O2/mg N	3.50	3.00-4.00
o2_no2n	Oxygen uptake rate per unit of NO2-N oxidation	real	mg O2/mg N	1.07	1.00-1.40
alg_grow	Maximum specific algal growth rate at 20ºC	real	1/day	2.0	1.00-3.00
alg_resp	Algal respiration rate at 20ºC	real	1/day or 1/hr	2.50	0.05-5.0
slr_act	Fraction of solar radiation computed in the temperature heat balance that is photosynthetically active	real	fraction	0.30	0.0-1.0
lt_co	Half-saturation coefficient for light	real	MJ/(m^2*hr)	0.75	0.223-1.135
const_n	Michaelis-Menton half-saturation constant for N	real	mg N/L	0.02	0.01-0.30
const_p	Michaelis-Menton half saturation constant for P	real	mg P/L	0.03	0.001-0.05
lt_nonalg	Non-algal portion of the light extinction coefficient	real	1/m	1.0	0.0-10.0
alg_shd_l	Linear algal self-shading coefficient	real	1/(m*ug chla/L)	0.03	0.006-0.065
alg_shd_nl	Nonlinear algal self-shading coefficient	real	(1/m)(ug chla/L)^(-2/3)	0.05	0.0-1.0
nh3_pref	Algal preference factor for ammonia	real	none	0.50	0.0-1.0