| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 98 === This research investigated into the influence of irrigation water requirement with the change of irrigation operation including channel supply and wire supply. Its use of irrigation water on the lead and the pond irrigation system has the effect of regulation and storage efficiency benefits. Tao-Yuan Channel #2 Feeder is selected as the study area. The irrigation resource included Shih-men reservoir, Nankan stream and Puxin stream. The agriculture irrigation system model was established by adapting Vensim model and the irrigation water supply data in 2008 was applied. The different simulations of irrigation management are used to estimate the significance of pond irrigation system for agriculture
irrigation. The simulation was divided into three cases: (1) normal state,(2) closing of the water intake weir and, (3) closing of the water intake pond. The result shows that closing pond irrigation system adversely affected on growing of the crops. And the water shortage occurred with
the centralization rainfall pattern in second crop given the condition of ponds. Therefore, the pond irrigation system is playing an important role in agricultural irrigation under extreme rainfall patterns.
The early stage of Taiwan’s water demand included agricultural water, domestic and industrial water. Agriculture water consumption has the largest quantity of water demand (70 ~ 75%), but in recent years, the
increasing domestic and industrial water occurred to decrease agricultural water ratio gradually. When facing with the water shortage, domestic and industrial water have high priority induced lack of agricultural water and fields will change cultural type from work to fallow.
In this study, the runoff that flowed out from the downstream irrigation section can be reused as new recycling water without transporting loss. Assuming the return flow can be pumped up to upstream irrigation section and be used as irrigation water. The result
shows that the irrigation water reduced 50.7% and 86.2% for original demand in first and second crop after using new recycling water as the irrigation water.
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