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Quantifying the impact of urban area expansion on groundwater recharge and surface runoff |
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| Authors: | Tamer Eshtawi Mariele Evers Bernhard Tischbein |
| Affiliation: | 1. Centre for Development Research (ZEF), Bonn University, Bonn, Germanys7taeshi@uni-bonn.de;3. Geography Department, Bonn University, Bonn, Germany;4. Centre for Development Research (ZEF), Bonn University, Bonn, Germany |
| Abstract: | ABSTRACTIn this surface water modelling study, a new spatial evaluation for assessing the impact of urbanization was applied for the semi-arid watersheds intersecting with the Gaza coastal aquifer. The SWAT model was calibrated and validated in a semi-automated approach for streamflow in the main watersheds. The results show that the model could simulate water budget components adequately within the complex semi-arid watersheds. Linear relationships between the change in urban area and the corresponding change in surface runoff or percolation were concluded for the urbanized sub-basins. The urban-surface runoff index (USI) and the urban-percolation index (UPI) were developed to represent a micro-level evaluation of different urban change scenarios in the sub-basins. The global urban-surface runoff index (GUSI) and the global urban-percolation index (GUPI) were derived as macro-level factors reflecting the influence on the overall Gaza coastal aquifer due to urban area expansion. Editor D. Koutsoyiannis Associate editor E. Rozos |
| Keywords: | urban change spatial response SWAT simulation sensitivity analysis percolation index surface runoff index |