田面坡度是影响畦灌灌水质量的重要因素,研究田面坡度对灌水性能的影响时,要结合灌水定额、平整精度、田面糙率和单宽流量等参数进行分析.通过对常规平地技术条件下多组合灌溉参数模拟分析得出:不同灌水定额、平整精度、田面糙率和单宽流量组合对应不同的最佳田面坡度,当灌水定额为60.00 mm,平整精度为4.25 cm,田面糙率为0.12,单宽流量分别为4、3 L/(s·m)和2 L/(s· m)时,反向模拟出最佳的田面坡度分别为1.6‰、1.8‰和2.2‰；并通过研究田面坡度对水流推进和消退过程的影响得出:田面坡度为2.0‰的水流推进和消退过程曲线明显比1.6‰和1.2‰的曲线平滑,说明在较小的单宽流量条件下,相对较大的田面坡度可使田面水流运动更加稳定,有利于改善灌水质量.%As field surface slope is an important factor which influences irrigation efficiency in border irrigation, it is necessary to study its influence on irrigation capability in combination with irrigation quota, land leveling precision, land roughness and flux per width. Irrigation simulation in different irrigation factors by general technical level off border indicates: different irrigation quota, land leveling precision, land roughness and flux per width are corresponding to different optimum field surface slop, optimization slopes are 1 .6%o, 1.8%o and 2.2%o by reverse simulation when irrigation quota is 60mm, land leveling precision is 4.25 cm, land roughness is 0. 12 and flux per width are respectively 4 L/(s·m), 3 L/(s·m) and 2 L/(s·m) . The study of water flux advance and regression process in different field surface slopes concludes that the curve of water flux advance and regression of process field surface slopes in 2.0‰ is more smooth than in 1.6‰ and 1.2‰, indicating that water flux advance in relatively larger field surface slope is stable and and is favorable for the improvement of irrigation quality in smaller flux per width.
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