渠道取水流量與水閘門的啟閉開度有相當大的關聯性，尤其在水資源開發不易的環境下，各灌溉渠道放出正確的流量將有助於節省水資源，使得每一滴水都有它的用處。而水閘門開度啟閉將影響整個灌溉渠道系統，於水路工作站待水流穩定後需多次調整水閘門才能放出正確流量。
　　本研究案例採用嘉南大圳南幹線灌區之二期作稻作及三年二作初放水期間之流量與水閘門開度資料進行模擬，其供灌水量約15cms為南幹線放水量較大時段。
　　已知各灌溉水路之查定流量後利用標準步推法進行迴水演算計算南幹線渠道水位變化，並可作為各取水門之上游水位依據，進而計算該灌溉水路在該查定流量下，取水門所需開度提供工作站參考依據。工作站依據初次建議開度操作水閘門後，由物聯網平台將數據回傳後，修正查定流量及支線水門上游水深後，重新建議修正水閘門建議開度，提高工作站水閘門調整效率。
　　本文精準各灌溉水路放水流量，並於放水或是旬間改變水量前提供水閘門建議開度，有效提高現地工作站轄區內水閘門調整效率。結果顯示透過本研究修正查定流量及支線水門上游水深後，能有效降低麻豆支線放水流量誤差8.9%與善化支線放水流量誤差8.2%。

There is related between the water intake flow of the channel and the opening and closing of the sluice gate, especially it is not easy to develop water resources. Each irrigation channel flows the correct rate, it will help to save water resources and make every drop of water useful. And the opening of sluice gate will affect the irrigation channel system. After the water flow being stable, the sluice gates need to be adjusted many times to flow the correct rate.
This case study uses the water flow and sluice gate opening data during the first stage in the South trunk of the Chia-Nan irrigation channel. The water supply for irrigation is about 15cms, which is the period when the water discharge in the south trunk is relatively large.
After determining the projected water volume of each irrigation channel, the standard step method is used to calculate the water level change of the south trunk and use it as the basis for the upstream water level of each sluice gate. Then calculate the require opening of the water intake gate of irrigation channel under the projected water volume to provide a reference basis for the workstation. After the workstation operates the sluice gate according to the initial recommended opening, the data is returned from the platform panel, and the projected water volume and the upstream water depth of gate are corrected. Then the proposed sluice gate opening is revised to improve the adjustment efficiency of the workstation.
This paper refines the discharge flow of each irrigation channel, and provides the recommended opening of the sluice gate before releasing the water or changing the water volume in ten-day period. It can effectively improve the efficiency of water gate adjustment in the workstation. The results show that the correction of the flow rate and the upstream water depth of the branch gate can effectively reduce the error of 8.9% of the discharge flow of the Ma-dou irrigation channel and 8.2% of the discharge of the Shan-hua irrigation channel.

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