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首页> 外文期刊>Vadose zone journal VZJ >Parameterizing a Coupled Surface-Subsurface Three-Dimensional Soil Hydrological Model to Evaluate the Efficiency of a Runoff Water Harvesting Technique
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Parameterizing a Coupled Surface-Subsurface Three-Dimensional Soil Hydrological Model to Evaluate the Efficiency of a Runoff Water Harvesting Technique

机译：参数化地表-地下三维土壤水文耦合模型以评估径流集水技术的效率

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摘要

Tools are needed to quantitatively evaluate the efficiency of water harvesting techniques in dryland environments under a wide range of climatic and soil physical conditions. In a case study for the arid zone of Chile, a detailed water balance was calculated using a coupled surface-subsurface hydrological model (HydroGeoSphere). In a first step, the model was parameterized with detailed runoff and soil water content data collected during simulated rainfall to calibrate surface and subsurface flow processes simultaneously, using six responsive parameters identified by a global sensitivity analysis. The calibrated model accurately reproduced observed soil moisture contents (R~2 = 0.92) and runoff amounts (R~2 = 0.97), and represented the overflowing infiltration trench, which is a clear improvement over existing frameworks that do not consider surface-subsurface flow interactions. A comparative analysis with a natural slope demonstrated that the trench was efficient in capturing runoff under high rainfall intensities, such as the one simulated, resulting in a significant decrease (46%) of runoff. In the final section, a detailed water balance of the trench was calculated for four characteristi c years with increasing precipitation. Significant differences in the water balance components were only observed for the very wet year (with a return period of 67 yr), where 64% of the potential runoff was effectively harvested and stored in the soil profile. As such, this test case shows the ability of HydroGeoSphere to adequately represent the water balance components of a runoff water harvesting technique and shows its potential to become an effective tool for optimal water harvesting design, while taking both soil physical and climatic constraints intoaccount.
机译：需要使用工具来定量评估各种气候和土壤物理条件下旱地环境中集水技术的效率。在智利干旱区的一个案例研究中，使用地表-地下水文耦合模型（HydroGeoSphere）计算了详细的水平衡。第一步，使用通过全球敏感性分析确定的六个响应参数，使用模拟降雨期间收集的详细径流量和土壤含水量数据对模型进行参数化，以同时校准地表和地下流量过程。校准后的模型准确地再现了观测到的土壤水分含量（R〜2 = 0.92）和径流量（R〜2 = 0.97），并代表了溢出的入渗沟，这是对不考虑地表下渗流的现有框架的明显改进。互动。用自然坡度进行的比较分析表明，该沟渠在高降雨强度下能有效捕获径流，如模拟的那样，导致径流显着减少（46％）。在最后一节中，随着降水的增加，计算了四个特征年的沟渠详细水平衡。仅在非常潮湿的一年（返回期为67年）中观察到水平衡成分的显着差异，其中有效收获的潜在径流的64％储存在土壤剖面中。这样，该测试用例显示了HydroGeoSphere能够充分代表径流集水技术中水平衡组成部分的能力，并显示了它有可能成为优化集水设计的有效工具，同时兼顾了土壤物理和气候限制。

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