parameters.bsn

This file contains basin-level parameters.

Field	Type	Description	Unit	Default	Range
lai_noevap	real	Leaf area index at which no evaporation occurs from water surface		3	0-10
sw_init	real	Initial soil water storage expressed as a fraction of field capacity water content		0	0-1
surq_lag	real	Surface runoff lag coefficient		4	1-24
adj_pkrt	real	Peak rate adjustment factor for sediment routing in the subbasin (tributary channels)		1	0.5-2
adj_pkrt_sed	real	Peak rate adjustment factor for sediment routing in the main channel		1	0-2
lin_sed	real	Linear parameter for calculating the maximum amount of sediment that can be reentrained during channel sediment routing		0.0001	0.0001-0.01
exp_sed	real	Exponent parameter for calculating sediment reentrained in channel sediment routing		1	1-1.5
orgn_min	real	Rate factor for humus mineralization of active organic nutrients (N and P)		0.0003	0.001-0.003
n_uptake	real	Nitrogen uptake distribution parameter		20	0-100
p_uptake	real	Phosphorus uptake distribution parameter		20	0-100
n_perc	real	Nitrate percolation coefficient		0.2	0-1
p_perc	real	Phosphorus percolation coefficient	10m^3/M	10	10-17.5
p_soil	real	Phosphorus soil partitioning coefficient	m^3/Mg	175	100-200
p_avail	real	Phosphorus availability index		0.4	0.01-0.7
rsd_decomp	real	Residue decomposition coefficient		0.05	0.02-0.1
pest_perc	real	Pesticide percolation coefficient		0.5	0-1
msk_co1	real	Coefficient to control the impact of the storage time constant for normal flow on the overall storage time constant for the channel		0.75	0-10
msk_co2	real	Coefficient to control the impact of the storage time constant for low flow on the overall storage time constant for the channel		0.25	0-10
msk_x	real	Weighting factor control relative importance of inflow rate and outflow rate in determining storage on reach		0.2	0-0.3
nperco_lchtile	real	Nitrogen concentration coefficient for tile flow and leaching from bottom layer		0	0-1
evap_adj	real	Reach evaporation adjustment factor		0.6	0.5-1
cn_co	real	Currently not used
denit_exp	real	Denitrification exponential rate coefficient		1.4	0-3
denit_frac	real	Denitrification threshold water content		1.3	0-1
man_bact	real	Fraction of manure applied to land areas that has active colony forming units		0.15	0-1
adj_uhyd	real	Adjustment factor for subdaily unit hydrograph basetime		0	0-1
cn_froz	real	Parameter for frozen soil adjustment on infiltration/runoff		0.000862	0-0
dorm_hr	real	Time threshold used to define dormancy	hrs	0	0-24
plaps	real	Precipitation lapse rate	mm/km
tlaps	real	Temperature lapse rate	deg C/km	0.5	0-1
n_fix_max	real	Maximum daily nitrogen fixation	kg/ha	20	1-20
rsd_decay	real	Minimum daily residue decay		0.01	0-0.05
rsd_cover	real	Residue cover factor for computing fraction of cover		0.3	0.1-0.5
urb_init_abst	real	Maximum initial abstraction for urban areas		5	0-10
petco_pmpt	real	PET adjustment for Penman/Monteith and Priestley-Taylor methods		0.184	0.09-0.27
uhyd_alpha	real	Alpha coefficient for gamma function unit hydrograph		5	0.5-10
splash	real	Splash erosion coefficient		1	0.9-3.1
rill	real	Rill erosion coefficient		0.7	0.5-2
surq_exp	real	Exponential coefficient for overland flow		1.2	1-3
cov_mgt	real	Scaling parameter for cover and management factor for overland flow erosion		0.03	0.001-0.45
cha_d50	real	Median particle diameter of main channel	mm	50	10-100
co2	real	CO2 concentration at start of simulation	ppm	1.57	1-5
day_lag_max	real	Maximum days to lag hydrographs for HRUs, routing units, and channels
igen	integer	Random generator code		0	0-1