Developing an irrigation model using both surface water and groundwater for a mixed paddy rice and upland crops field

Ray Shyan Wu, Jih Shun Liu, Shen Yu Chang, Chia Sheng Su, Pei Ying Chen

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Taiwan's agricultural water expected use irrigation channel to irrigate crops, farmers also choose pumped groundwater to fill a vacancy in the irrigation channel. A large amount of agricultural water will be used in crop growth stage. The study area is located in the midst of Taiwan Changhua Cizaipijun aqueduct. Taking into account the farmers’ irrigation experience and in-field irrigation operating, this study applies system dynamic model to establish an irrigation water management model for mixed paddy rice and upland crops fields. This model can follow the crop growth stage of the irrigation basic point and irrigation demand point, automatically determine the pumping time and rate, reach the target water depth then stop. This model can automatically identify the groundwater pumping time and the rate. It can reduce the possible human errors of the farmers during the operation of pumping. Moreover, this study, through the model to simulate a good agricultural water results, was able to explore the irrigation water use situation and further to enhance the water distribution efficiency of agricultural water use. In this study, the hydrological data such as rainfall, evaporation, crop growth time and so on. Using the irrigation water management model to simulate the change of crop water demand with different area paddy rice and upland crops area ratio. To explore the situation of irrigation water, so that agricultural irrigation water and groundwater for easy to management. In general, the application of channel water and/or groundwater irrigation depends on the crop planting condition, such as crops planting ratio and the growth stage of crops. The results shown that the ratio of crops cultivation and the growing stage of crops significantly affect the irrigation water capacity. When the area of paddy rice cultivation increase, the need of irrigation water capacity will increase. However, if the water supply of canal do not increase but the area of paddy rice cultivation increase, the groundwater pumping in the paddy field will raise. According to the results of analysis in channel water supply priority model, if the upstream irrigation area can be modeled and partly provided by groundwater, it can reduce the amount of water supply taken from channel water. In other words, the allocation of canal water can be adjusted to the downstream area, and the upstream area water demand can obtain additional supplement from groundwater. To make each round block can pass through the drought period. This study discusses the influence of groundwater pumping and groundwater level. In the second rice crop period has received frequent rainfall with spatial and temporal uniformity is directly proportional to the recharge of groundwater and pumping situation. Then, the groundwater recharge is also increased. By comparing the pumping rate and groundwater level for the first and the second rice crop period in 2015, the second rice crop period pumping is more reasonable than the first rice crop period.

原文???core.languages.en_GB???
頁(從 - 到)60-90
頁數31
期刊Journal of Taiwan Agricultural Engineering
64
發行號1
出版狀態已出版 - 3月 2018

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