Abstract
In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.
Highlights
Coastal aquifer systems are considered a water resource reservoir of ample importance, since almost 50% of global population lives within a zone of several kilometers away from the coast and depend largely on them for their water supply
This paper describes the use of a complete set of field hydrogeological investigations for the analysis of a coastal aquifer system in semi-arid conditions, in order to form the basis for the development of a conceptual aquifer model
The broader region morphology, on the south and south-east, is identified by low relief and some shallow pits, creating minor ponds, that are fragment of the eastern Nestos River delta wetland
Summary
Coastal aquifer systems are considered a water resource reservoir of ample importance, since almost 50% of global population lives within a zone of several kilometers away from the coast and depend largely on them for their water supply. It can be realized that sustainable use of groundwater is considered a key issue for the optimized management of water resources of these systems, which in turn relies solely on extensive monitoring of hydrologic processes. The latter, is usually conducted within a model-driven approach, as it usually provides a mathematical model with input data in order to predict the future response of the aquifer under different optimizations scenarios. Based on the above, the research involved the application of a mathematical groundwater flow simulation model
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