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@ARTICLE{Ehlers:279649,
      author       = {Ehlers, L. and Herrmann, F. and Blaschek, M. and Duttmann,
                      R. and Wendland, F.},
      title        = {{S}ensitivity of m{GROWA}-simulated groundwater recharge to
                      changes in soil and land use parameters in a {M}editerranean
                      environment and conclusions in view of ensemble-based
                      climate impact simulations},
      journal      = {The science of the total environment},
      volume       = {543},
      issn         = {0048-9697},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-07531},
      pages        = {937 - 951},
      year         = {2016},
      abstract     = {This study examines the impact of changing climatic
                      conditions on groundwater recharge in the Riu Mannu
                      catchment in southern Sardinia. Based on an ensemble of four
                      downscaled and bias corrected combinations of Global and
                      Regional Climate Models (GCM–RCMs), the deterministic
                      distributed water balance model mGROWA was used to simulate
                      long-term mean annual groundwater recharge in the catchment
                      for four 30-year periods between 1981 and 2100. The four
                      employed GCM–RCM combinations project an adverse climatic
                      development for the study area: by the period 2071–2100,
                      annual rainfall will decrease considerably, while grass
                      reference evapotranspiration will rise. Accordingly,
                      ensemble results for our base scenario showed a
                      climate-induced decrease in the median of annual groundwater
                      recharge in areas covered by Macchia from 42–48 mm/a to
                      25–35 mm/a between the periods 1981–2010 and
                      2071–2100, corresponding to a reduction of $17–43\%.$ To
                      take into account the influence of additional plant
                      available water storage in weathered bedrock on groundwater
                      recharge generation, the model was extended by a regolith
                      zone for regions covered by Mediterranean Macchia. In a set
                      of model runs (“scenarios”), parameter values
                      controlling the water storage capacity of this zone were
                      increased step-wise and evaluated by comparison to the base
                      scenario to analyze the sensitivity of the model outcome to
                      these changes. The implementation of a regolith zone had a
                      considerable impact on groundwater recharge and resulted in
                      a decrease of the median in annual groundwater recharge: by
                      2071–2100, the $35\%$ scenario (available water content in
                      the regolith of 3.9 to 5.7 $vol.\%)$ showed a reduction of
                      $67–82\%$ as compared to the period 1981–2010 in the
                      base scenario. In addition, we also examined the influence
                      of changes in the crop coefficients (Kc) as well as
                      different soil texture distributions on simulated
                      groundwater recharge.},
      cin          = {IBG-3},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000367638000008},
      doi          = {10.1016/j.scitotenv.2015.04.122},
      url          = {https://juser.fz-juelich.de/record/279649},
}