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首页> 外文期刊>Water Resources Management >A New Model for Simulating Supplemental Irrigation and the Hydro-Economic Potential of a Rainwater Harvesting System in Humid Subtropical Climates
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A New Model for Simulating Supplemental Irrigation and the Hydro-Economic Potential of a Rainwater Harvesting System in Humid Subtropical Climates

机译：亚热带湿润气候中雨水收集系统补充灌溉和水力经济潜力的模拟新模型

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摘要

Here we have developed a new model to simulate supplemental irrigation and the hydro-economic potential of a rainwater harvesting system in rainfed agricultural areas. Using the model, soil moisture in rainfed crop land, supplemental irrigation requirements, rainwater storage in an on-farm reservoir (OFR) system, and surface and ground water availability were predicted. In an irrigated system, an OFR was used to harvest rainwater during the rainy season, and stored water was applied to cropland as supplemental irrigation (SI). An economic analysis was performed to calculate the benefits due to an OFR irrigation system, and gains from increased crop yield and downstream water availability in the irrigated OFR system were compared with rainfed system (i.e. no OFR). In addition, we calculated the impacts of dry and wet seasons on total value gains (grain and water gains) for irrigated and rainfed conditions and performed a sensitivity analysis to quantify the impacts of model input parameters on total value gains. Analyses showed that the OFR system can produce crop yields three times greater than rainfed agriculture. During a water stress season, the total water use in the irrigated system was 65 % greater than for the rainfed system. Water use efficiency of the irrigated system was 82 % higher than for the rainfed system. In a dry season, the total value gains due to increased crop yield by supplemental irrigation and downstream water availability of the irrigated system were 74 % greater than for the rainfed system, while in a wet season the total value gain of the irrigated system was 14 % greater than for the rainfed system. A precipitation scenario analysis of wet and dry seasons indicated that the benefits of a rainwater harvesting system can be considerably greater in dry seasons than wet seasons.
机译：在这里，我们开发了一个新模型来模拟补充灌溉以及雨养农业地区雨水收集系统的水力经济潜力。使用该模型，预测了旱作农田的土壤湿度，补充灌溉要求，农田水库（OFR）系统中的雨水存储以及地表水和地下水的可利用性。在灌溉系统中，在雨季使用OFR收集雨水，并将存储的水作为补充灌溉（SI）应用于农田。进行了经济分析以计算由于OFR灌溉系统而带来的收益，并将灌溉的OFR系统中与增雨灌溉系统（即无OFR）相比，从增加的作物产量和下游可用水量中获得的收益。此外，我们计算了旱季和雨季对灌溉和雨养条件下总价值增加（粮食和水的获取）的影响，并进行了敏感性分析，以量化模型输入参数对总价值增加的影响。分析表明，OFR系统产生的农作物产量是雨养农业的三倍。在缺水季节，灌溉系统的总用水量比雨养系统高65％。灌溉系统的用水效率比雨养系统高82％。在干旱季节，由于补充灌溉和灌溉系统的下游可用水量增加了农作物的产量，总价值收益比雨养系统高74％，而在潮湿季节，灌溉系统的总价值收益为14比雨养系统大％。雨季和旱季的降水情景分析表明，雨水收集系统的收益在旱季比雨季要大得多。

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