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首页> 外文期刊>Journal of Hydrology >Analyzing subsurface drain network performance in an agricultural monitoring site with a three-dimensional hydrological model
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Analyzing subsurface drain network performance in an agricultural monitoring site with a three-dimensional hydrological model

机译：利用三维水文模型分析农业监测点的地下排水管网性能

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Effectiveness of a subsurface drainage system decreases with time, leading to a need to restore the drainage efficiency by installing new drain pipes in problem areas. The drainage performance of the resulting system varies spatially and complicates runoff and nutrient load generation within the fields. We presented a method to estimate the drainage performance of a heterogeneous subsurface drainage system by simulating the area with the three-dimensional hydrological FLUSH model. A GIS analysis was used to delineate the surface runoff contributing area in the field. We applied the method to reproduce the water balance and to investigate the effectiveness of a subsurface drainage network of a clayey field located in southern Finland. The subsurface drainage system was originally installed in the area in 1971 and the drainage efficiency was improved in 1995 and 2005 by installing new drains. FLUSH was calibrated against total runoff and drain discharge data from 2010 to 2011 and validated against total runoff in 2012. The model supported quantification of runoff fractions via the three installed drainage networks. Model realisations were produced to investigate the extent of the runoff contributing areas and the effect of the drainage parameters on subsurface drain discharge. The analysis showed that better model performance was achieved when the efficiency of the oldest drainage network (installed in 1971) was decreased. Our analysis method can reveal the drainage system performance but not the reason for the deterioration of the drainage performance. Tillage layer runoff from the field was originally computed by subtracting drain discharge from the total runoff. The drains installed in 1995 bypass the measurement system, which renders the tillage layer runoff calculation procedure invalid after 1995. Therefore, this article suggests use of a local correction coefficient based on the simulations for further research utilizing data from the study area. (C) 2015 Elsevier B.V. All rights reserved.
机译：地下排水系统的效率会随着时间而降低，导致需要通过在问题区域安装新的排水管来恢复排水效率。所得系统的排水性能在空间上变化，并使田间径流和养分负荷的产生变得复杂。我们提出了一种通过用三维水文FLUSH模型模拟区域来估算非均质地下排水系统排水性能的方法。地理信息系统分析被用来划定田间地表径流贡献区域。我们应用该方法重现了水的平衡并研究了位于芬兰南部的黏土田的地下排水网络的有效性。地下排水系统最初于1971年在该地区安装，1995年和2005年通过安装新的排水装置提高了排水效率。 FLUSH已针对2010年至2011年的总径流量和排水流量数据进行了校准，并针对2012年的总径流量进行了验证。该模型支持通过三个已安装的排水网络对径流分数进行量化。产生了模型实现以调查径流贡献区域的范围以及排水参数对地下排水的影响。分析表明，当最旧的排水管网（安装于1971年）的效率降低时，可获得更好的模型性能。我们的分析方法可以揭示排水系统的性能，但不能揭示排水性能下降的原因。农田的耕作层径流最初是通过从总径流中减去排水量来计算的。 1995年安装的排水管绕过了测量系统，这使1995年以后的耕作层径流计算程序无效。因此，本文建议根据模拟结果使用局部校正系数，以利用研究区域的数据进行进一步研究。 （C）2015 Elsevier B.V.保留所有权利。

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