Description Usage Arguments Details Value Examples
This function runs the EPGM model for a specific simulated period. The model is based primarily upon data collected in the early 1990's along the phosphorus gradient in WCA-2A. Substantial additional data collected since then in WCA-2A and other locations indicate a need to recalibrate the model and potentially revise its structure. Recent data suggest, for example, that the relationship between cattail density and soil P needs recalibration and that actual soil P thresholds for biological impacts are probably lower than reflected in the original calibrations. There are also issues relating to interpretation of and potential anomalies in the historical soil P calibration data attributed to variations in soil core collection method and definition of the soil/water interface (inclusion vs. exclusion of floc layer). There are also indications in the recent data of biologically-mediated vertical transport and/or mixing that are not reflected in the current model structure.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | EPGMProfile(
case.no = NA,
Start.Discharge = NA,
STA.outflow.TPconc = NA,
STA.outflow.vol = NA,
FlowPath.width = NA,
Hydroperiod = NA,
Soil.Depth = NA,
Soil.BulkDensity.initial = NA,
Soil.TPConc.initial = NA,
Vertical.SoilTPGradient.initial = NA,
Soil.BulkDensity.final = NA,
PSettlingRate = NA,
P.AtmoDep = NA,
Rainfall = NA,
ET = NA,
Yr.Display = 30,
Max.Yrs = 200,
Max.Dist = 15,
Dist.increment.km = 0.1,
plot.profile = TRUE,
raw.output = FALSE,
results.table = TRUE,
summary.distance = c(0, 0.5, 1, 2, 4, 8, 10)
)
|
case.no |
Case number from the pre-loaded example data (values ranges from 1 to 12) |
Start.Discharge |
The year which this particular STA began discharge operations. |
STA.outflow.TPconc |
Outflow total phosphorus concentration (in ug L-1; micrograms per liter) for this STA. |
STA.outflow.vol |
Annual outflow discharge volume (in x1000 Acre-Feet Year-1) for this STA. |
FlowPath.width |
The width of the downstream flow path (in kilometers). |
Hydroperiod |
Average hydroperiod (time above ground surface) of the downstream system (in percent). |
Soil.Depth |
Depth of soil (in centimeters). |
Soil.BulkDensity.initial |
The initial bulk density prior to dicharge of the soil downstream of the system (in g cm-3). |
Soil.TPConc.initial |
The initial total phosphorus concentration of soil prior to discharge downstream of the system (in mg kg-1). |
Vertical.SoilTPGradient.initial |
The soil total phosphorus concentration gradient prior to dischage downstream of the system (in mg cm-3 cm-1). |
Soil.BulkDensity.final |
The final bulk density after dischage of the soil downstream of the system (in g cm-3). |
PSettlingRate |
The phosphorus settling rate estimated from steady-state conditions (m Year-1). |
P.AtmoDep |
Phosphorus atmospheric depostition loading rate (in mg m-2 Year-1). |
Rainfall |
Annual accumulated rainfall estimate (m Year-1). |
ET |
Annual evapotranspiration estimate (m Year-1). |
Yr.Display |
Output displays results for this time (years) |
Max.Yrs |
Maximum number of years simulated |
Max.Dist |
Maximum ditance plotted, default is 50 km |
Dist.increment.km |
Distance increment modeled |
plot.profile |
If |
raw.output |
If |
results.table |
if |
summary.distance |
Default is |
As described in the original documentation, the model is designed to simulate marsh enrichment (responses to increasing P load), not recovery (responses to decreasing in load).
This function computes and plots the distance profile along the gradient based on input values
1 2 3 | EPGMProfile(case.no=11)
EPGMProfile(NA,1991,38,526,15.3,50,10,0.05,257,-0.004,0.04,15.2,45,1.3,1.4)
|
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