Investigating the Impact of Climate Change on the Irrigation Water Requirement in Northern Taiwan

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Investigating the Impact of Climate Change on the Irrigation Water Requirement in Northern Taiwan

May 4, 2021 Engineering 0

The demand for irrigation water will be influenced by changes in meteorological effects as a result of climate change, and irrigation water will still account for the majority of Taiwan’s water consumption. Climate change has an effect on irrigation water in Taoyuan, Taiwan, according to this report. Rainfall and temperature projections for the years 2046–2065 are based on five downscaled general circulation models. The Hamon method is used to calculate potential evapotranspiration, which is then corrected using the quadrant transformation method. The potential crop water requirement, efficient rainfall, and demand for irrigation water can be estimated using forecasts and a water balance model in paddy fields. A comparison of the current (2004–2011) and the future (2046–2065) clearly demonstrates that climate change would cause both rainfall and temperature to rise, resulting in increased effective rainfall and crop water requirements during future cropping seasons. Overall, rising crop water requirements are offset by increasing successful rainfall, and the gap in average irrigation water requirements between now and the future is negligible (2.5 percent). However, based on a five-year return period, the potential irrigation demand in the first cropping season is 7.1 percent higher than the current one, but it is insignificantly lower (2.1 percent) in the second cropping season. Increased effective rainfall cancels out the increased crop water demand, making the gap in irrigation requirements between now and the future negligible.

Author (s) Details

Jyun-Long Lee
Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan

Wen-Cheng Huang
Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan

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