SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Effect of Climate Change on Environmental Flow Indicators in the Narew Basin, Poland 
Authors:Piniewski, M., C.L.R. Laize, M.C. Acreman, T. Okruszko and C. Schneider 
Journal:Journal of Environmental Quality 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:climate change  
Secondary Application Category:model comparison 
Watershed Description:The River Narew upstream of the Zambski Kościelne gauging station (drainage area ca. 28,000 km^2) in northeast Poland 
Calibration Summary:Discharge at Ostrołęka GRDC station no. 6458810; period 1976-2000 Daily NSE: 0.66 Monthly NSE: 0.74 Daily R2: 0.67 Monthly R2: 0.75 
Validation Summary:not provided 
General Comments: 
Abstract:Environmental flows — the quantity of water required to maintain a river ecosystem in its desired state—are of particular importance in areas of high natural value. Water-dependent ecosystems are exposed to the risk of climate change through altered precipitation and evaporation. Rivers in the Narew basin in northeastern Poland are known for their valuable river and wetland ecosystems, many of them in pristine or near-pristine condition. The objective of this study was to assess changes in the environmental flow regime of the Narew river system, caused by climate change, as simulated by hydrological models with different degrees of physical characterization and spatial aggregation. Two models were assessed: the river basin scale model Soil and Water Assessment Tool (SWAT) and the continental model of water availability and use WaterGAP. Future climate change scenarios were provided by two general circulation models coupled with the A2 emission scenario: IPSL-CM4 and MIROC3.2. To assess the impact of climate change on environmental flows, a method based conceptually on the “range of variability” approach was used. The results indicate that the environmental low regime in the Narew basin is subject to climate change risk, whose magnitude and spatial variability varies with climate model and hydrological modeling scale. Most of the analyzed sites experienced moderate impacts for the Generic Environmental Flow Indicator (GEFI), the Floodplain Inundation Indicator, and the River Habitat Availability Indicator. The consistency between SWAT and WaterGAP for GEFI was medium: in 55 to 66% of analyzed sites, the models suggested the same level of impact. Hence, we suggest that state-ofthe-art, high-resolution, global- or continental-scale models, such as WaterGAP, could be useful tools for water management decisionmakers and wetland conservation practitioners, whereas models such as SWAT should serve as a complementary tool for more specific, smaller-scale, local assessments.