pastas.stats.signatures.duration_curve_slope#

pastas.stats.signatures.duration_curve_slope(series: pandas.Series, l: float = 0.1, u: float = 0.9, normalize: bool = False) → float#

Slope of the head duration curve between percentile l and u after Oudin et al. [2010].

Parameters:

  • series (pandas.Series) – Pandas Series with DatetimeIndex and head values.

  • l (float, optional) – lower percentile, a float between 0 and 1, lower than u.

  • u (float, optional) – upper percentile, a float between 0 and 1, higher than l.

  • normalize (bool, optional) – normalize the time series to values between zero and one.

Returns:

Slope of the head duration curve between percentile l and u.

Return type:

float

Notes

Slope of the head duration curve between percentile l and u. The more negative the slope, the more values are above or below the percentile l and u, and vice versa.

Note that the slope is negative, contrary to the flow duration curve commonly used in surface water hydrology.