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首页> 外文期刊>Canadian Water Resources Journal >Modeling of subsurface agricultural drainage using two hydrological models with different conceptual approaches as well as dimensions and spatial scales
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Modeling of subsurface agricultural drainage using two hydrological models with different conceptual approaches as well as dimensions and spatial scales

机译：使用两种水文模型对地下农业排水进行建模，这两种水文模型采用不同的概念方法，尺寸和空间比例

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摘要

In regions where soils are seasonally or perennially wet, subsurface drainage represents an essential water management practice. Two hydrological models with different modeling approaches as well as different dimensional and spatial scales, DRAINMOD (1D, lumped and field-scale) and CATHY (3D, spatially distributed and watershed-scale), were compared in terms of their performance to predict tile-drain flow and to simulate evapotranspiration (ET) under field conditions. Two metrics were defined to assess the capacity of the models to represent the soil water dynamics: relative errors in simulating peak flow and drainage volume. Using different hydraulic conductivity scenarios, both models provided similar results. For the total predicted/observed tile-drain flow comparison, the two models yielded very similar results. In terms of coefficient of determination (R-2) and Nash-Sutcliffe model efficiency (NSE), their performances were low in simulating tile-drain flows for dry periods (low observed tile-drain flow). During periods with higher observed tile-drain flow, the performance of both models was good (R-2>0.75 and NSE mostly>0.60), but DRAINMOD produced better results than CATHY did. The two models had similar ET values (R-2>0.80). Regarding the impact of the hydraulic conductivity of each soil layer on subsurface drainage outflow, this study showed that the soil layer below the tile-drain system was the most influential for the two models.
机译：在土壤季节性或常年潮湿的地区，地下排水是一项重要的水资源管理实践。比较了两种具有不同建模方法以及不同尺寸和空间尺度的水文模型DRAINMOD（一维，集总和野外尺度）和CATHY（3D，空间分布和分水岭尺度），以预测它们的性能。排水，并模拟田间条件下的蒸散量（ET）。定义了两个指标来评估模型代表土壤水动力学的能力：模拟峰值流量和排水量时的相对误差。使用不同的水力传导率方案，这两个模型提供了相似的结果。对于总的预测/观测到的瓷砖排水流比较，这两个模型得出的结果非常相似。就确定系数（R-2）和Nash-Sutcliffe模型效率（NSE）而言，它们在模拟干旱时段的瓷砖排水流方面的性能较低（观察到的瓷砖排水流较低）。在观察到的瓷砖排水流较高的时期，两个模型的性能都很好（R-2> 0.75，NSE大多> 0.60），但是DRAINMOD的效果比CATHY更好。两种模型的ET值相似（R-2> 0.80）。关于每个土壤层的水力传导率对地下排水流出的影响，这项研究表明，对于两个模型，瓷砖-排水系统下方的土壤层影响最大。

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  • 来源
    《Canadian Water Resources Journal》 |2017年第1期|38-53|共16页
  • 作者

    Muma Mushombe; Rousseau Alain N.; Gumiere Silvio J.;

  • 作者单位

    Univ Quebec, Ctr Eau Terre Environm INRS ETE, Inst Natl Rech Sci, Quebec City, PQ, Canada;

    Univ Quebec, Ctr Eau Terre Environm INRS ETE, Inst Natl Rech Sci, Quebec City, PQ, Canada;

    Univ Laval, Dept Sols & Genie Agroalimentaire, Quebec City, PQ, Canada;

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