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Water 2017, 9(10), 735; https://doi.org/10.3390/w9100735

Regional Climate Change Impacts on Irrigation Vulnerable Season Shifts in Agricultural Water Availability for South Korea

1
Department of Bioresources and Rural Systems Engineering, Hankyong National University, Anseong 17579, Korea
2
Institute of Agricultural Environmental Science, Hankyong National University, Anseong 17579, Korea
3
Institute on the Environment, University of Minnesota, Minneapolis, MN 55108, USA
4
United States Department of Agriculture (USDA)-Agricultural Research Service (ARS) Environmental Microbial & Food Safety Laboratory, Beltsville Agricultural Research Center, Beltsville, MD 20705, USA
5
Oak Ridge Institute of Science and Engineering, Oak Ridge, TN 37830, USA
6
Department of Rural Systems Engineering and Research Institute for Agriculture and Life Science, Seoul National University, Seoul 151742, Korea
*
Author to whom correspondence should be addressed.
Received: 10 August 2017 / Revised: 22 September 2017 / Accepted: 25 September 2017 / Published: 26 September 2017
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Abstract

Reservoirs are principal water resources that supply irrigation water to paddy fields and play an important role in water resources management in South Korea. For optimal irrigation reservoir operation and management, it is necessary to determine the duration of irrigation water shortages. Management of reservoir operation and irrigation scheduling should take into consideration essential variables that include the water supply in a reservoir and the water demand in the associated irrigation district. The agricultural water supply and demand show different patterns based on the variability and uncertainty of meteorological and hydrological phenomena. The duration of excessive water supply can be quantitatively determined through analysis of deviations and changes in the timing of agricultural water supply and demand. In this study, we introduce an approach to assess the vulnerable seasons of paddy irrigation to enable more effective operation and management of reservoirs. The vulnerable seasons were evaluated through comparison of the potential water supply capacity and irrigation water requirements based on water budget analysis via a time series change analysis. We have assessed the changing in the total duration and duration shifts of the vulnerable irrigation seasons for four agricultural reservoirs using past observed data (1981–2010) from meteorological stations maintained by the Korea Meteorological Administration (KMA) and projected climate change scenarios (2011–2100) as depicted by the Representative Concentration Pathways (RCPs) emission scenarios. For irrigation vulnerable seasons under both the RCP 4.5 and RCP 8.5 scenarios, the results showed periods of significant increases in which total vulnerable seasons compared to the historical period; the longest duration of vulnerability occurred during the 2071–2100 period under the RCP 8.5. Identification of the vulnerable seasons for paddy irrigation can be applied in agricultural water management to more effectively manage reservoir operation during irrigation periods with climate changes. View Full-Text
Keywords: reservoir; climate change; irrigation water requirement; water supply capacity; irrigation scheduling; Representative Concentration Pathways (RCPs); South Korea reservoir; climate change; irrigation water requirement; water supply capacity; irrigation scheduling; Representative Concentration Pathways (RCPs); South Korea
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Nam, W.-H.; Kim, T.; Hong, E.-M.; Choi, J.-Y. Regional Climate Change Impacts on Irrigation Vulnerable Season Shifts in Agricultural Water Availability for South Korea. Water 2017, 9, 735.

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