Description Usage Arguments Details Value Author(s) References See Also Examples

Various baseflow separation methods

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`runoff` |
vector of runoff heights (equidistant temporal resolution) [L/T] |

`method` |
base-flow separation method, see details. |

`parms` |
method-specific paramters, see details. The effect of the parameter will be dependent on the temporal resolution of the runoff series. |

`method="DFM"`

(default) selects baseflow separation using a single-pass digital filter method (e.g. Sawicz et al, 2011). It uses the parameter `c`

, varying between 0 (baseflow close to runoff) to 1 (constant baseflow). \
q_direct[i] = max(0, cc*qd[i-1]+(1+cc)/2*(runoff[i]-runoff[i-1]), na.rm=TRUE)

`method="constant_slope"`

separates base flow by drawing a line with constant slope from the minima of the hydrograph to the next intersection with it. Dingman (2002) recommends for the parameter `c_slope`

a value depending on catchment area A (A < 20 mi<b2>): c_slope = 0.05 ft<b3>/s * A /h. You do the math, imperial units suck.

`method="RLSWM"`

re-scaled LOWESS-smoothed window minima. Determines the minima in a moving window of `window_size`

timesteps and smoothes them using `lowess`

with parameter `f_lowess`

. If at any timestep baseflow is larger than the runoff, the entire baseflow-series is shrunk linearly.

vector holding base flow time series

Till Francke

Sawicz, K., Wagener, T., Sivapalan, M., Troch, P. A., & Carrillo, G. (2011). Catchment classification: empirical analysis of hydrologic similarity based on catchment function in the eastern USA. *Hydrology and Earth System Sciences*, 15(9), 2895<96>2911. http://dx.doi.org/10.5194/hess-15-2895-2011

Dingman, S. L. (2002). Physical hydrology. Upper Saddle River, NJ: Prentice Hall.

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