signatures

Module containing methods to compute the groundwater signatures.

Part of the signatures selection is based on the work of Heudorfer et al. [2019].

Examples

Compute the coefficient of variation of the mean monthly head:

cv = ps.stats.cv_period_mean(series)

Functions

cv_period_mean(→ float)	Coefficient of variation of the mean head over a period (default monthly).
cv_date_min(→ float)	Coefficient of variation of the date of annual minimum head.
cv_date_max(→ float)	Coefficient of variation of the date of annual maximum head.
parde_seasonality(→ float)	Parde seasonality according to Pardé [1933], adapted for heads.
avg_seasonal_fluctuation(→ float)	Average seasonal fluctuation after Martens et al. [2013].
interannual_variation(→ float)	Interannual variation after Martens et al. [2013].
colwell_constancy(→ tuple[float, float, float])	Colwells constancy index after Colwell [1974].
colwell_contingency(→ tuple[float, float, float])	Colwell's contingency Colwell [1974].
low_pulse_count(→ float)	Average number of times the series is below a certain threshold per year.
high_pulse_count(→ float)	Average number of times the series exceeds a certain threshold per year.
low_pulse_duration(→ float)	Average duration of pulses where the head is below a certain threshold.
high_pulse_duration(→ float)	Average duration of pulses where the head exceeds a certain threshold.
rise_rate(→ float)	Mean of positive head changes from one day to the next.
fall_rate(→ float)	Mean negative head changes from one day to the next.
cv_rise_rate(→ float)	Coefficient of Variation in rise rate.
cv_fall_rate(→ float)	Coefficient of Variation in fall rate.
magnitude(→ float)	Calculate the magnitude of head variability.
reversals_avg(→ float)	Average annual number of rises and falls in daily head.
reversals_cv(→ float)	Coefficient of Variation in annual number of rises and falls.
mean_annual_maximum(→ float)	Mean of annual maximum head after Clausen and Biggs [2000].
bimodality_coefficient(→ float)	Bimodality coefficient after Ellison [1987].
recession_constant(→ float)	Recession constant adapted after Kirchner [2009].
recovery_constant(→ float)	Recovery constant after Kirchner [2009].
duration_curve_slope(→ float)	Slope of the head duration curve.
duration_curve_ratio(→ float)	Ratio of the head duration curve.
richards_pathlength(→ float)	Compute the path length of the time series, standardized by time series length.
baselevel_index(→ float)	Compute Base level index (BLI).
baselevel_stability(→ float)	Baselevel stability after Heudorfer et al. [2019].
autocorr_time(→ float)	Lag where the autocorrelation function exceeds a cut-off value.
date_min(→ float)	Compute the average date of the minimum head value with circular statistics.
date_max(→ float)	Compute the average date of the maximum head value with circular statistics.