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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 6. Enhanced pH buffering input parameters in the water-quality model for the Link River to Keno Dam reach of the Klamath River, Oregon.


[Abbreviations: pKa, acid dissociation constant; OM, organic matter; POM, particulate matter]


Parameter Value Description
PHBUFC ON Option to use enhanced buffering routines
NCALKC ON Option to use nonconservative alkalinity algorithms
NH4BUFC ON Specifies whether ammonia/ammonium is included in pH buffering
PO4BUFC ON Specifies whether phosphoric acid is included in pH buffering
OMBUFC ON Specifies whether organic matter is included in pH buffering
OMTYPE MONO MONO specifies discrete pKa values
NAG 2 Number of organic acid/base groups to model
POMBUFC OFF Specifies whether POM is included in OM buffering
SDEN1 0.1925 Site density for organic group 1, in moles of acid/base sites per mole of carbon in OM
SDEN2 0.6466 Site density for organic group 2, in moles of acid/base sites per mole of carbon in OM
PK1 5.584 The pKa values (negative log10 of the acid dissociation constant)
PK2 9.594 The pKa values (negative log10 of the acid dissociation constant)

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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