pastas.stats.signatures

This module contains methods to compute the groundwater signatures.

Functions

amplitude_range	Range of unscaled groundwater head.
autocorr	Lag where the first peak in the autocorrelation function occurs after Wang et al. [2006].
avg_seasonal_fluctuation	Classification according to Martens et al. [2013].
baseflow_index	Baseflow index according to Organization [2008].
baseflow_stability	Baseflow stability after Heudorfer et al. [2019].
bimodality_coefficient	Bimodality coefficient after Ellison [1987].
colwell_components	Colwell's predictability, constant, and contingency Colwell [1974].
colwell_constancy	Colwells constancy index after Colwell [1974].
colwell_contingency	Colwell's contingency Colwell [1974]
critical_bandwidth	Test statistic of the Silverman test, after Silverman [1981].
cv_date_min	Coefficient of variation of the date of annual minimum head.
cv_fall_rate	Coefficient of Variation in fall rate.
cv_period_mean	Coefficient of variation of mean head over a period (default monthly).
cv_rise_rate	Coefficient of Variation in rise rate.
duration_curve_range	Range of the duration curve between the percentile l and u after Richards [1990].
duration_curve_slope	Slope of the duration curve between percentile l and u after Oudin et al. [2010].
excess_mass	Test statistic of the dip test, after Hartigan and Hartigan [1985].
fall_rate	Mean negative head changes from one day to the next.
high_pulse_count	Number of times the series exceeds a certain threshold.
high_pulse_duration	Average duration of pulses where the head exceeds a certain threshold.
hurst_exponent	Hurst exponent according to Wang et al. [2006].
interannual_variation	Interannual variation after Martens et al. [2013].
low_pulse_count	Number of times the series drops below a certain threshold.
low_pulse_duration	Average duration of pulses where the head is below a certain threshold.
lyapunov_exponent	The exponential rate of divergence of nearby data points after Hilborn and others [2000].
magnitude	Difference of peak head to base head, divided by base head after Hannah et al. [2000].
mean_annual_maximum	Mean of annual maximum after Clausen and Biggs [2000].
parde_coefficients	Parde coefficients for each month Pardé [1933].
parde_seasonality	Parde seasonality according to Pardé [1933].
peak_base_time	Difference between peak and base head, standardized by duration of peak after Heudorfer et al. [2019].
peak_timescale	Area under peak divided by difference of peak head to peak base after Gaál et al. [2012].
recession_constant	Recession constant after Kirchner [2009].
recovery_constant	Recovery constant after Kirchner [2009].
reversals_avg	Average annual number of rises and falls in daily head.
reversals_cv	Coefficient of Variation in annual number of rises and falls.
richards_baker_index	Richards-Baker index according to Baker et al. [2004].
richards_pathlength	The path length of the time series, standardized by time series length after Baker et al. [2004].
rise_rate	Mean of positive head changes from one day to the next.
summary	Method to get many signatures for a time series.