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Hydrologidagarna , 18 mars 2014. Ezra Haaf [email protected]. Estimating Extreme Groundwater Levels. Hydrologidagarna , 18 Mars 2014. Estimating extreme groundwater levels. Damage caused by: Buoyancy Landslides In water resources management . Hydrologidagarna , 18 Mars 2014. - PowerPoint PPT Presentation
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ESTIMATING EXTREME GROUNDWATER LEVELS1
Estimating Extreme Groundwater Levels
18 MARS 2014
Hydrologidagarna, 18 mars 2014
Ezra [email protected]
ESTIMATING EXTREME GROUNDWATER LEVELS2 18 MARS 2014
Estimating extreme groundwater levelsHydrologidagarna, 18 Mars 2014
› Damage caused by:› Buoyancy› Landslides
› In water resources management
ESTIMATING EXTREME GROUNDWATER LEVELS3
› Unclear which distributions can be used
› Many long time series in SGU’s groundwater network available
› Parameter convergence vs time series length
What is interesting about this?
18 MARS 2014
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS4
Basic steps to estimation of return levels
18 MARS 2014
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS5
Distributions tested
18 MARS 2014
› Distributions tested:› Normal› Generalized extreme
value› Log Pearson type 3› …
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS6
Model-adequacy: Anderson-Darling
18 MARS 2014
› 8 series for normal distribution rejected
› GEV rejected for cases with far outliers and negative skewness
› LP3 rejected for far outliers
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS7
L-moment diagram with Anderson Darling: Normal distribution
18 MARS 2014
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS8
Convergence of mean of groundwater time series
18 MARS 2014
Hydrologidagarna, 18 Mars 2014
ESTIMATING EXTREME GROUNDWATER LEVELS9
› Normal distribution often good model but not always adequate
› Good convergence of mean value after 12 years
› GEV and LP3 good alternatives
Conclusions
18 MARS 2014
Hydrologidagarna, 18 Mars 2014