Salt chemistry effects on salinity assessment in the Arkansas River Basin, Colorado Cooper, Curtis Allen ; Cardon, G. E. (Grant Edmund) ; Davis, Jessica Salinity -- Arkansas River Watershed Soils, Salts in -- Arkansas River Watershed Watershed management -- Arkansas River Valley Water-supply, Agricultural -- Arkansas River Watershed Environmental monitoring -- Arkansas River Watershed Arkansas River Valley "March 2006" "Completion Report 206" "Project 2004CO99B" 60 p. Includes bibliographical references (p. 54-59) Calibration equations developed in this research, use either depth averaged or depth weighted salt concentrations and/or predicted pore water salt concentrations from Visual Minteq. For example, the current Downstream sub-region calibration equation relating EM readings to soil ECe has an R2 of 0.54 with an root mean square error (RMSE) of 2.16 dS m-1. The equation from this research, using depth weighted Mg concentrations and SAR with Visual Minteq has an R2 of 0.93 with a RMSE of 1.34 dS m-1, and is effective for both the Upstream and Downstream sub-regions. Validation of these equations suggests that predictability is equivalent between the initial sub-region model and the models for the entire region. The inclusion of the chemistry/mineralogy in the calibration equations serves to resolve some of the unevenness of the EMv-ECe calibration, but at the cost of more complex computing and data requirements. However, the inclusion of the chemical data offers an alternate approach not yet utilized in extrapolating the calibration of the EM-38 from a field to a regional scale. Colorado State University. Libraries Colorado Water Resources Research Institute 2006 text ; image application/pdf COMP206.pdf CCRICWRI100005CRPT eng Completion report (Colorado Water Resources Research Institute) ; no. 206 Colorado c2006 Colorado Water Resources Research Institute
Salt chemistry effects on salinity assessment in the Arkansas River Basin, Colorado
Cooper, Curtis Allen ; Cardon, G. E. (Grant Edmund) ; Davis, Jessica
Salinity -- Arkansas River Watershed
Soils, Salts in -- Arkansas River Watershed
Watershed management -- Arkansas River Valley
Water-supply, Agricultural -- Arkansas River Watershed
Environmental monitoring -- Arkansas River Watershed
Arkansas River Valley
"March 2006"
"Completion Report 206"
"Project 2004CO99B"
60 p.
Includes bibliographical references (p. 54-59)
Calibration equations developed in this research, use either depth averaged or depth weighted salt concentrations and/or predicted pore water salt concentrations from Visual Minteq. For example, the current Downstream sub-region calibration equation relating EM readings to soil ECe has an R2 of 0.54 with an root mean square error (RMSE) of 2.16 dS m-1. The equation from this research, using depth weighted Mg concentrations and SAR with Visual Minteq has an R2 of 0.93 with a RMSE of 1.34 dS m-1, and is effective for both the Upstream and Downstream sub-regions. Validation of these equations suggests that predictability is equivalent between the initial sub-region model and the models for the entire region. The inclusion of the chemistry/mineralogy in the calibration equations serves to resolve some of the unevenness of the EMv-ECe calibration, but at the cost of more complex computing and data requirements. However, the inclusion of the chemical data offers an alternate approach not yet utilized in extrapolating the calibration of the EM-38 from a field to a regional scale.
Colorado State University. Libraries
Colorado Water Resources Research Institute
2006
text ; image
application/pdf
COMP206.pdf
CCRICWRI100005CRPT
eng
Completion report (Colorado Water Resources Research Institute) ; no. 206
Colorado
c2006 Colorado Water Resources Research Institute