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Estimating Extreme Groundwater Levels

Hydrologidagarna , 18 mars 2014. Ezra Haaf ezha@cowi.se. 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.

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Estimating Extreme Groundwater Levels

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  1. Hydrologidagarna, 18 mars 2014 Ezra Haaf ezha@cowi.se Estimating Extreme Groundwater Levels Estimating Extreme Groundwater Levels

  2. Hydrologidagarna, 18 Mars 2014 Estimating extreme groundwater levels • Damage caused by: • Buoyancy • Landslides • In water resources management Estimating Extreme Groundwater Levels

  3. Hydrologidagarna, 18 Mars 2014 What is interesting about this? • Unclear which distributions can be used • Many long time series in SGU’s groundwater network available • Parameter convergencevs time serieslength Estimating Extreme Groundwater Levels

  4. Hydrologidagarna, 18 Mars 2014 Basic steps to estimation of return levels Estimating Extreme Groundwater Levels

  5. Hydrologidagarna, 18 Mars 2014 Distributions tested • Distributions tested: • Normal • Generalized extreme value • Log Pearson type 3 • … Estimating Extreme Groundwater Levels

  6. Hydrologidagarna, 18 Mars 2014 Model-adequacy: Anderson-Darling • 8 series for normal distribution rejected • GEV rejected for cases with far outliers and negative skewness • LP3 rejected for far outliers Estimating Extreme Groundwater Levels

  7. Hydrologidagarna, 18 Mars 2014 L-moment diagram with Anderson Darling: Normal distribution Estimating Extreme Groundwater Levels

  8. Hydrologidagarna, 18 Mars 2014 Convergence of mean of groundwater time series Estimating Extreme Groundwater Levels

  9. Hydrologidagarna, 18 Mars 2014 Conclusions • Normal distribution often good model but not always adequate • Good convergence of mean value after 12 years • GEV and LP3 good alternatives Estimating Extreme Groundwater Levels

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