桃園農田水利會新屋地區特定灌區之迴歸水量量測及模式分析(桃園農田水利研究發展基金會)

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桃園農田水利會新屋地區特定灌區之迴歸水量量測及模式分析

Plan Name: The in-situ measurement of returned water analysis of returned water model for specific irrigation and at Sing-Wu district of TAOYUAN

摘要: 本研究協助桃園農田水利會進行觀音工作站第11-2號小組灌區進行田區入滲量回歸到下游坵塊之回歸水量分析工作。研究成果分別如下：1. 依現場湛水深資料，並利用水田水收支平衡方程式計算得田區內入滲回歸水量比例5.6%~10.9%。並依滲水深在0.1~12公分時，利用量測資料進行回歸水與滲水深關係分析，得其回歸方程式為Y=-0.0651 x2+1.7016x。2. 一期作之日回歸水量(不含田區逕流量)除乾田排水期間，無回歸水產生之外，其餘時間日回歸水量大致上在1.0~1.5公釐之間，累積回歸水為121.3公厘。由於農田一次灌溉均可提供3~6天之水田湛水，故一次灌溉之回歸水比例約為6~12%，一期作經模擬結果回歸水比例12%。二期作之日回歸水除乾田及排水期間，無回歸水產生外，其餘時間日回歸水量大致上在0.75~1.25公釐之間，累積回歸水量為101.8公厘。此外，回歸水比例除於排水日因湛水深遽降低，而回歸水量並無明顯減少之情況下，使得回歸水量大幅提升至10%以上外，其餘日回歸水比例約為2~4%，二期作經模擬結果回歸水比例為10%。

Abstract: In the study, we investigate the returned flow at the 11-2 group of Kuan-Yin working station of Tao-Yuan Irrigation Association. The study results are as follows:1. According to the measurement of irrigation depth, the returned flow ratio is about 5.6%~10.9% which is estimated by using the water budget. Also, a regression curve, Y=-0.0651x2+1.7016x is obtained from the returned flow and the measured irrigation depth.2. For the first term, the returned flow is about 1.0~1.5 mm in depth and the accumulated returned flow in 121.3mm. This is not including the drying and drainage period because there is no returned flow during the period. For each irrigation period it will sustain in the paddy area for 3~6 days. The returned flow ratio is about 6~12% for each irrigation period. The result for the simulation of returned flow ratio is 12%.For the second term, the returned flow is about 0.75~1.25mm in depth and the accumulated returned flow is 101.8mm to addition, the returned flow ratio will be 10% during the period of drainage for the low irrigation depth. However, in general the returned flow ratio is about 2~4%. The result for the simulation of returned flow ratio is 10%.