Abstract
This study analyzes the temporal impacts of climate change on irrigation water requirement (IWR) and yield for rainfed rice and irrigated paddy respectively at Ngamoeyeik Irrigation Project (NIP) in Myanmar. Climate projections from two General Circulation Models (GCMs) namely ECHAM5 (scenario A2 and A1B) and HadCM3 (scenarios A2 and B2) were derived for NIP for future time windows (2020s, 2050s and 2080s). The climate variables were downscaled to basin level by using Statistical DownScaling Model (SDSM). Calibrated and validated AquaCrop v4.0 model was used to forecast the rainfed (May–October) yield and irrigation water requirement for irrigated paddy (November–April) under future climate. The analysis shows a decreasing trend in maximum temperature (−0.8 to +0.1 °C) for the three scenarios and three time windows considered; however, an increasing trend is observed for minimum temperature (+0.2 to +0.4 °C) for all cases. The analysis on precipitation also suggests that rainfall in wet season is expected to vary largely from −29 % (2080s; A1B) to +21.9 % (2080s; B2) relative to the average rainfall of the baseline period. A higher variation is observed for the rainfall in dry season ranging from −42 % for 2080s, B2; and +96 % in case of 2020s, A2 scenario. A decreasing trend of irrigation water requirement is observed for irrigated paddy in the study area under the three scenarios indicating that small irrigation schemes are suitable to meet the requirements. An increasing trend in the yield of rainfed paddy was estimated under climate change demonstrating the increased food security in the region.
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Shrestha, S. (2014). Assessment of Climate Change Impacts on Irrigation Water Requirement and Rice Yield for Ngamoeyeik Irrigation Project in Myanmar. In: Climate Change Impacts and Adaptation in Water Resources and Water Use Sectors. Springer Water. Springer, Cham. https://doi.org/10.1007/978-3-319-09746-6_5
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