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Ocean-side Water Level Intensity

OsWL_Intensity.Rd

Calculates the "intensity" of extreme water levels, as defined in Wahl et al. (2011).

Usage

OsWL_Intensity(
  Data,
  Cluster_Max,
  Base_Line = mean(Data$OsWL, na.rm = TRUE),
  Rainfall_Interval = 24
)

Arguments

Data

A data frame with co-occurring rainfall and O-sWL time series in two columns labeled "Rainfall" and "OsWL", respectively.

Cluster_Max

Numeric vector containing indexes of peaks in the O-sWL column of Data. If analyzing a sample conditioned on O-sWL derived using Con_Sample_2D() set equal to the $xcon output.

Base_Line

Numeric vector of length one, specifying water level about which to calculate the intensity. Default is the mean O-sWL.

Rainfall_Interval

Numeric vector of length one, specifying length of time before and after a peak over which to sum rainfall totals. Total window width is 2*Rainfall_Interval+1. Default is 24.

Value

A data frame with the following columns:

  • Pre.High Index of the OsWL column of Data containing the preceding high water level.

  • Fol.High Index of the OsWL column of Data containing the following high water level.

  • Pre.Low Index of the OsWL column of Data containing the preceding low water level.

  • Fol.Low Index of the OsWL column of Data containing the following low water level.

  • Intensity Intensity of the O-sWL.

  • V Total rainfall volume within Rainfall_Interval before and after the peak.

See also

Decluster WL_Curve

Examples

#Decluster O-sWL series at S-13 using a runs method
S13.OsWL.Declust = Decluster(Data=S13.Detrend.df$OsWL,
                            SepCrit=24*7, u=0.99667)
#Calculate O-sWL of the identified cluster maximum
intensity = OsWL_Intensity(Data=S13.Detrend.df,Cluster_Max=S13.OsWL.Declust$EventsMax)
#Plot O-sWL series identifying cluster maximum (in red) and print "intensity" above each maximum
plot(as.Date(S13.Detrend.df$Date_Time),
     S13.Detrend.df$OsWL)
points(as.Date(S13.Detrend.df$Date_Time[S13.OsWL.Declust$EventsMax]),
       S13.Detrend.df$OsWL[S13.OsWL.Declust$EventsMax],pch=16,col=2)
text(as.Date(S13.Detrend.df$Date_Time[S13.OsWL.Declust$EventsMax]),
     S13.Detrend.df$OsWL[S13.OsWL.Declust$EventsMax]+0.2,
     round(intensity$Intensity,0),cex=0.5)