| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 105 === In Changhua area, which is mainly composed of river stream irrigation, in the dry season due to the lack of rainfall so that the river flow dropped, but also coincides with the first phase of rice planting period, farmers often use groundwater to make up the amount of irrigation water, which causes the formation land subsidence and the cultivation of rice is more than the amount of irrigation water needed for dry crops. Therefore, how to allocate irrigation water effectively is an important issue.
In this study, the water consumption of rice was simulated by CROPWAT model, TaiWAP model and system dynamics, discuss the differences in the simulation results of each model. In the dry section, the CROPWAT model was used to simulate the water consumption of dry crops, to explore the difference of water use in rice and dry crops and to adjust the effect of water area on irrigation water use.
The results show that the crops are cultivated only in the form of rain-fed paddy field, can’t meet the normal growth of rice and dry crops required moisture. Using the CROPWAT model to simulate the irrigation water of rice, the results are more water than the TaiWAP model.In addition, this study uses the CROPWAT model to estimate the amount of field irrigation water for rice and maize, estimated by the ratio of different water fields, the results show that the irrigation water is enough when the rice area is 20% and the dry area is 80%. In the second period, all the rice areas were transferred to dry land, and the irrigation water was still insufficient. However, this study did not consider the amount of water to be reused.
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