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Scientific Investigations Report 2013–5016


Macrophyte and pH Buffering Updates to the Klamath River Water-Quality Model Upstream of Keno Dam, Oregon


Table 2. Macrophyte parameters in the updated water-quality model for the Link River to Keno Dam reach of the Klamath River, Oregon.


[Abbreviations: °C, degrees Celsius; g/g, gram per gram; m2/g, square meter per gram; g/m3,gram per cubic meter; 1/day, per day; POM, particulate organic matter; W/m2, Watt per square meter]


Parameter Pondweed Coontail Common waterweed Description
EXM 0.005 0.005 0.005 Light extinction due to macrophytes, m2/g
MG 0.28 0.37 0.31 Maximum macrophyte growth rate, 1/day
MR 0.07 0.09 0.09 Maximum macrophyte respiration rate, 1/day
MM 0.06 0.07 0.06 Maximum macrophyte mortality rate, 1/day
MSAT 6 3 7 Light saturation intensity at maximum photosynthetic rate, W/m2
MHSP 0.0 0.0 0.0 Macrophyte half-saturation for phosphorus limited growth, g/m3
MHSN 0.0 0.0 0.0 Macrophyte half-saturation for nitrogen limited growth, g/m3
MHSC 0.0 0.0 0.0 Macrophyte half-saturation for carbon limited growth, g/m3
MPOM 0.7 0.7 0.7 Fraction of macrophyte biomass converted to POM when macrophytes die
LRPMAC 0.2 0.2 0.2 Fraction of POM which originates as dead macrophytes becoming labile POM
PSED 0.8 0.0 0.8 Fraction of phosphorus uptake by macrophytes obtained from sediments
NSED 0.8 0.0 0.8 Fraction of nitrogen uptake by macrophytes obtained from sediments
MBMP 40 40 40 Threshold macrophyte concentration for which growth is moved to the above layer, g/m3
MMAX 108 108 108 Maximum macrophyte concentration, g/m3
CDDRAG 0.0 0.0 0.0 Macrophyte drag coefficient
MT1 9 14 14 Lower temperature parameter for rising rate function, °C
MT2 15 24 24 Upper temperature parameter for rising rate function, °C
MT3 19 27 27 Lower temperature parameter for falling rate function, °C
MT4 26 35 35 Upper temperature parameter for falling rate function, °C
MK1 0.05 0.05 0.05 Fraction of rate at MT1
MK2 0.99 0.99 0.99 Fraction of rate at MT2
MK3 0.99 0.99 0.99 Fraction of rate at MT3
MK4 0.10 0.01 0.01 Fraction of rate at MT4
MP 0.004 0.004 0.004 Stoichiometric equivalent between phosphorus and biomass, g/g
MN 0.054 0.054 0.054 Stoichiometric equivalent between nitrogen and biomass, g/g
MC 0.50 0.52 0.50 Stoichiometric equivalent between carbon and biomass, g/g
O2MR 1.5 1.5 1.5 Oxygen stoichiometry for macrophyte respiration
O2MG 1.4 1.4 1.4 Oxygen stoichiometry for macrophyte primary production

First posted March 1, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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