Introduction

Groundwater is a significant component of the freshwater cycle and its significance is becoming more prominent as the more accessible surface water resources are increasingly more exploited. In many cases, groundwater is a sufficient, secure

Department of Environmental Engineering, Dokuz Eyl├╝l University, Izmir 35160, Turkey e-mail: [email protected]

and cost-effective water supply. However, it is increasingly becoming stressed due to overexploitation, contamination and in some areas of the world due to climate change. It was emphasized in a technical paper by the second working group of the Intergovernmental Panel of Climate Change [1] that the information about the water-related impacts of climate change is insufficient, especially with respect to water quality, aquatic ecosystems and groundwater. Therefore, impacts of climate change on groundwater quantity and quality need to be comprehended and determined.

The main objective of this study is to present an overview of the modeling approach to assess the impact of climate change on groundwater systems. Basic requirements and different approaches of impact assessment studies are also presented. Some case studies demonstrating the various methodologies are summarized to provide the reader with contemporary applications of groundwater flow modeling with respect to climate change impacts. The article concludes with recommendations for more reliable impact studies.

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