module Gxg¶
This module contains a class GwGxg that calculates some descriptive statistics from a series of groundwater head measurements used by groundwater practitioners in the Netherlands
The structure and many of the methods in this module are adopted from the Pastas module dutch.py)
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acequia.stats.gxg.stats_gxg(ts, ref='datum')¶ Return table with GxG statistics
- Parameters
ts (aq.GwSeries, pd.Series) – Groundwater head time series
ref ({'datum','surface'}, optional) – Reference level for groundwater heads
- Returns
- Return type
pd.DataFrame
-
class
acequia.stats.gxg.Gxg(gw, srname=None, ref=None)¶ Calculate descriptive statistics for series of measured heads
- Parameters
gw (aq.GwSeries, pd.Series) – timeseries with groundwater head measurements
ref (['datum','surface'], default 'surface') – reference level for measurements
Notes
Traditionally in the Netherlands groundwater head series are decribed using decriptive statistics that characterise the mean highest level (GHG), the mean lowest level (GLG) and the mean spring level (GVG). These statistics are defined on head series with measurements on the 14th and 28th of each month. Therefore, heads series are internally resampled before calculating statistics.
For further reference: P. van der SLuijs and J.J. de Gruijter (1985). ‘Water table classes: a method to decribe seasonal fluctuation and duration of water table classes on Dutch soil maps.’ Agricultural Water Management 10 (1985) 109 - 125. Elsevier Science Publishers, Amsterdam.
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vg3()¶ Return VG3 (Spring Level) for each year
VG3 is calculated as the mean of groundwater head levels on 14 march, 28 march and 14 april
- Returns
- Return type
pd.Series
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vg1(maxlag=7)¶ Return VG (Spring Level) for each year
VG1 is calculated as measurement nearest to 1 april
- Returns
- Return type
pd.Series
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xg()¶ Return table of GxG groundwater statistics for each hydrological year
- Returns
- Return type
pd.DataFrame
-
gxg()¶ Return table with GxG for one head series
- Returns
- Return type
pd.DataFrame
-
gt()¶ Return groundwater class table
- Returns
- Return type
str