SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Investigating the effects of agricultural water management in a Mediterranean coastal aquifer under current and projected climate conditions 
Authors:Pisinaras, V., C. Paraskevas and A. Panagopoulos 
Volume (Issue):13(1) 
Article ID:108 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:model and/or data interface 
Secondary Application Category:evapotranspiration assessment 
Watershed Description:11,000 km^2 Pinios River, which drains to the Pinios River Deltaic Plain located in central Greece. 
Calibration Summary: 
Validation Summary: 
General Comments:The authors states at the start of Section 3.1 that: "Moreover, cultivation and irrigation practices, as well as capillary rise as estimated by HYDRUS-1D application were introduced in SWAT." It is not clear if this resulted in a modified version of SWAT; it is assumed here that modifications were not made. 
Abstract:Coastal delta plains are areas with high agricultural potential for the Mediterranean region because of their high soil fertility, but they also constitute fragile systems in terms of water resources management because of the interaction of underlying aquifers with the sea. Such a case is the Pinios River delta plain located in central Greece, which also constitutes a significant ecosystem. Soil and Water Assessment Tool (SWAT) and SEAWAT models were combined in order to simulate the impact of current water resources management practices in main groundwater budget components and groundwater salinization of the shallow aquifer developed in the area. Moreover, potential climate change impact was investigated using climate data from Regional Climate Model for two projected periods (2021–2050 and 2071–2100) and two sea level rise scenarios (increase by 0.5 and 1 m). Modeling results are providing significant insight: although the contribution of the river to groundwater inflows is significant, direct groundwater recharge from precipitation was found to be higher, while capillary rise constitutes a major part of groundwater outflows from the aquifer. Moreover, during the simulation period, groundwater flow from the aquifer to the sea were found to be higher than the inflows of seawater to the aquifer. Regarding climate change impact assessment, the results indicate that the variability in groundwater recharge posed by the high variability of precipitation during the projected periods is increasing the aquifer’s deterioration potential of both its quantity and quality status, the latter expressed by the increased groundwater Cl􀀀 concentration. This evidence becomes more significant because of the limited groundwater storage capacity of the aquifer. Concerning sea level rise, it was found to be less significant in terms of groundwater salinization impact compared to the decrease in groundwater recharge and increase in crop water needs. 
Keywords:seawater intrusion; Soil and Water Assessment Tool; SEAWAT model; irrigation management; groundwater; climate change; sea level rise