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首页> 外文期刊>Irrigation and Drainage >RIVER BASIN SCALE ANALYSIS ON THE RETURN RATIO OF DIVERTED WATER FROM IRRIGATED PADDY AREAS
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RIVER BASIN SCALE ANALYSIS ON THE RETURN RATIO OF DIVERTED WATER FROM IRRIGATED PADDY AREAS

机译：灌溉稻田引水回流比的河流流域规模分析

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摘要

Water flows in irrigated paddy areas are complicated not only by the substantial volumes involved but also by repeated cycles of diversion and return flow. A spatially explicit hydrological model that simulates water diversion and return processes in irrigated paddy areas was used to evaluate the return ratio of diverted water to river basin. Assuming complete mixing of the rainfall and irrigated water over the entire irrigation period, the time-averaged return flow was calculated using the simulated net drainage from the irrigated areas. The return ratio, which is defined as the fraction of the total return flow volume to the total diverted water volume, was 48.5% (ranging from 42.3 to 52.1%) in our case study. These values suggest that most of the water diverted to the irrigated paddies will be discharged except that which is lost through evapotranspiration, because we consider the return ratio during a sufficiently long period and for large irrigation areas. While the largest and smallest return ratios were obtained in the driest and wettest years, respectively, the correlation between rainfall amount and return ratio was not significant, suggesting the need for a more appropriate averaging period that accounts for the short-term variabilities in return flow processes. Copyright (C) 2016 John Wiley & Sons, Ltd.
机译：灌溉稻田中的水流不仅由于涉及的大量水量而复杂，而且由于反复的分流和回水循环而变得复杂。利用空间显着的水文模型模拟灌溉稻田的调水和回水过程，以评估调水到流域的回水率。假设在整个灌溉期内降雨和灌溉水完全混合，则使用模拟灌溉区域的净排水量计算时间平均回流。在我们的案例研究中，回流比定义为总回流流量占总分流水量的比例，为48.5％（从42.3％到52.1％）。这些值表明，转移到灌溉稻田的大部分水将被排出，但由于蒸发蒸腾而损失的水除外，因为我们考虑了在足够长的时间内和大面积灌溉区域的回水率。虽然分别在最干旱和最湿润的年份获得了最大和最小的回报率，但降雨量和回报率之间的相关性并不显着，这表明需要一个更合适的平均时期来考虑短期内回流的变化流程。版权所有（C）2016 John Wiley＆Sons，Ltd.

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