| Title: | An improved method for calculating the regional crop water footprint based on a hydrological process analysis |
| Authors: | Luan, K.-B., Y.-L Yin, P.-T. Wu, S.-K. Sun, Y.-B. Wang, X.-R. Gao and J. Liu |
| Year: | 2018 |
| Journal: | Hydrology and Earth System Sciences |
| Volume: | 22(10) |
| Pages: | 5111-5123 |
| Article ID: | |
| DOI: | 10.1007/s10333-018-0647-x |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | blue/green water or crop water productivity |
| Secondary Application Category: | irrigation impacts or irrigation BMP scenarios |
| Watershed Description: | 11,200 km^2 Hatao irrigation district, a tributary of the Yellow River that is located in the western part of Inner Mongolia in north central China |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The water balance and groundwater dynamics due to surface–groundwater interactions for watershed health assessment
were investigated for the Han River basin (34,148 km2) of South Korea using the Soil and Water Assessment Tool (SWAT).
The model was established considering 4 multipurpose dams and 3 multifunction weirs. The SWAT was spatially calibrated
and validated using daily observed inflows for the dam (2005–2014) and weir (2012–2014) as well as evapotranspiration,
soil moisture, and groundwater level data (2009–2013). The simulation results revealed the impact of surface–groundwater
exchange fluxes on the water balance and baseflow by evaluating the vertical water budget and horizontal water transfer.
Evapotranspiration in the surface and return flows from the shallow aquifer for the dry season was estimated to be 29 and
10% higher than for the wet season, respectively. Percolation’s role was also significant, providing approximately 24% of
the annual groundwater recharge to shallow aquifers in the rainy season. On average, the February to August period (A) was
characterized by a net flux of infiltration into the groundwater. For the September to January period (B), the proportion of
groundwater flow into the river of the basin was nearly balanced by a slight increase in surface water infiltration. During
period A of average surface water infiltration into the groundwater, the net groundwater recharge was positive and up to 20%
of the infiltration during this period resulted from groundwater recharge. These results showed that groundwater recharge is
strongly affected by the surface water and groundwater interactions. |
| Language: | English |
| Keywords: | SWAT; Dam operation; Water balance analysis; Surface–groundwater interactions; Watershed hydrological cycle |