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Assessment of Water Resources Availability and Groundwater Salinization in Future Climate and Land use Change Scenarios: A Case Study from a Coastal Drainage Basin in Italy

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Abstract

The joint effect of changes in climate and land use on the future availability of water resources was assessed under the SRES A1B and A2 climate scenarios as well as five land use scenarios for the 2080–2100 time-frame in an Italian coastal watershed. The study area is a small coastal polder (100 km2) characterized by irrigated agriculture, urban expansion, drainage, quarrying and sensitivity to salt-water intrusion. The hydroclimatic budget and the GALDIT index have been computed for assessing water resources availability and groundwater vulnerability to salinization, respectively. The methodology developed is integrated into a tool based on Excel™, which supported the development of scenarios in participatory processes. The conclusions emerged from the analysis are the following: (1) climate change is more effective than land use change in controlling future freshwater availability and amplifies the imbalance between winter surplus and summer deficits, (2) freshwater availability in the summer will likely be affected by an increase in evaporation from open water surfaces due to increased temperature, whereas winter surplus would increase, (3) the vulnerability of the coastal aquifer to salinization will probably moderately increase but an inherent limitation of the GALDIT index to land use change parameters prevents a sound assessment. Strategies that may be proposed to administrators and stakeholders are based on increasing storage of seasonal water surplus.

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Acknowledgments

The work was funded by a CIRCLEMED grant to the WATERKNOW project. We thank Andrea Minchio and Elizabeth General Diaz for helping in data elaboration as well as two anonymous reviewers who helped in improving the quality of the paper.

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Authors and Affiliations

  1. Environmental Management Research Group, Interdepartmental Center for Ressearch in Environmental Science (CIRSA), University of Bologna, via Sant’Alberto 163, Ravenna, 48123, Italy

    L Benini

  2. Integrated Geoscience Research Group (IGRG), University of Bologna, Sant’Alberto 163, Ravenna, 48123, Italy

    M Antonellini, M Laghi & P. N. Mollema

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  1. L Benini
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  2. M Antonellini
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  4. P. N. Mollema
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Correspondence to L Benini.

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Benini, L., Antonellini, M., Laghi, M. et al. Assessment of Water Resources Availability and Groundwater Salinization in Future Climate and Land use Change Scenarios: A Case Study from a Coastal Drainage Basin in Italy. Water Resour Manage 30, 731–745 (2016). https://doi.org/10.1007/s11269-015-1187-4

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