Impact Assessment of Global Warming on Irrigation and Drainage and Future Countermeasures using a Distributed Water Circulation Model

针对未来可能增加的极端事件（干旱和洪水），开展了全球变暖对农业用水和排水的影响评估，并利用水库运行用水管理和稻田防洪功能评价了应对措施。在这种方法中，该水循环模型可以估计稻田的种植面积，稻田的需水量，在流域的任何地点和时间，以及作为径流量的水可用性。此外，还研究了全球变暖对不同时段降雨量的影响，从而建立了系统的内部降雨模式生成方法。

Focused on extremes (droughts and floods), which are expected to increase in future, impact assessment of global warming on agricultural water use and drainage are carried out and countermeasures against those were evaluated by utilizing water management of reservoir operation and flood prevention function of paddies. In this approach, this water circulation model turned out to estimate the cropping area of rice paddies, the water requirements of paddy fields, at any location and time in the basin, as well as water availability as runoff amounts. In addition, the change of rainfall amounts in different durations due to global warming were examined, so that a systematic generation method for internal rainfall patterns was developed.