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pastas.stats.signatures#

This module contains methods to compute the groundwater signatures. Part of the signatures selection is based on the work of Heudorfer et al. [2019].

Functions

autocorr_time

Lag where the autocorrelation function exceeds a cut-off value.

avg_seasonal_fluctuation

Average seasonal fluctuation after Martens et al. [2013].

baselevel_index

Base level index (BLI) adapted after Organization [2008].

baselevel_stability

Baselevel stability after Heudorfer et al. [2019].

bimodality_coefficient

Bimodality coefficient after Ellison [1987].

colwell_constancy

Colwells constancy index after Colwell [1974].

colwell_contingency

Colwell's contingency Colwell [1974]

cv_date_max

Coefficient of variation of the date of annual maximum head.

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 the mean head over a period (default monthly).

cv_rise_rate

Coefficient of Variation in rise rate.

date_max

Compute the average date of the maximum head value with circular statistics.

date_min

Compute the average date of the minimum head value with circular statistics.

duration_curve_ratio

Ratio of the head duration curve between the percentile l and u after Richards [1990].

duration_curve_slope

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

fall_rate

Mean negative head changes from one day to the next.

high_pulse_count

Average number of times the series exceeds a certain threshold per year.

high_pulse_duration

Average duration of pulses where the head exceeds a certain threshold.

interannual_variation

Interannual variation after Martens et al. [2013].

low_pulse_count

Average number of times the series exceeds a certain threshold per year.

low_pulse_duration

Average duration of pulses where the head is below a certain threshold.

magnitude

Difference between the minimum and maximum heads, divided by the minimum head adapted after Hannah et al. [2000].

mean_annual_maximum

Mean of annual maximum head after Clausen and Biggs [2000].

parde_seasonality

Parde seasonality according to Pardé [1933], adapted for heads.

recession_constant

Recession constant adapted 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_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.