Using SWAT for Strategic Planning of Basin Scale Irrigation Control Policies

a Case Study from a Humid Region in Northern Germany

authored by: N. Maier, J. Dietrich
Abstract: The eco-hydrological model SWAT is used worldwide for simulating hydrology and water quality of agricultural catchments. One of the main water uses is irrigation, predominantly in arid and semi-arid regions. Climate impact simulations show that a future increase of irrigation demand can be expected for humid regions. Options for adaptation include the improvement of irrigation techniques and the modification of crop patterns. In our study we investigate the application of SWAT for the development of water saving irrigation control strategies in a humid river catchment in Northern Germany. We developed different scenarios using both soil moisture deficit control and plant water demand control. The results show plausible changes of irrigation amounts when changing the trigger points of both control methods. By deficit control strategies, the water consumption could be reduced with only a moderate decrease of crop yield. Differences between soil characteristics were well shown in the SWAT simulations, but the model consistently overestimated irrigation values. Furthermore we found a high variability of the model errors between the different years, even if the long term average values are considered acceptable. Future research is needed to improve the model accuracy in automatic irrigation control.
Organisation(s): Institute of Hydrology and Water Resources Management
External Organisation(s): Justus Liebig University Giessen
Type: Article
Journal: Water resources management
Volume: 30
Pages: 3285-3298
No. of pages: 14
ISSN: 0920-4741
Publication date: 07.2016
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Civil and Structural Engineering, Water Science and Technology
Sustainable Development Goals: SDG 13 - Climate Action
Electronic version(s): https://doi.org/10.1007/s11269-016-1348-0 (Access: Closed)