• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Contaminant Hydrology >Predicting rapid herbicide leaching to surface waters from an artificially drained headwater catchment using a one dimensional two-domain model coupled with a simple groundwater model
【24h】

Predicting rapid herbicide leaching to surface waters from an artificially drained headwater catchment using a one dimensional two-domain model coupled with a simple groundwater model

机译：使用一维两域模型和简单地下水模型预测从人工排水的集水区到地表水的快速除草剂浸出

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pesticide losses to water can present problems for environmental management, particularly in catchments where surface waters are abstracted for drinking water supply. The relative role of different transfer pathways (spray drift, spills, overland flow and leaching from soils) is often uncertain, and there is a need for experimental observation and modelling to ensure that processes are understood under a range of conditions. Here we examine the transport of propyzamide and carbetamide in a small (15.5 ha) headwater sub-catchment dominated by an artificially drained field with strongly undulating topography (topographic gradients > 1:10). Specifically, we explore the validity of the "field-scale lysimeter" analogy by applying the one dimensional mathematical model MACRO. Although one dimensional representation has been shown to be reasonable elsewhere, the scale and topography of the monitored system challenge many of the underlying assumptions. MACRO considers two interacting flow domains: micropores and macropores. The effect of subsurface drains can also be included. A component of the outflow from the main drain was identified as originating from an upslope permeable shallow aquifer which was represented using a simple groundwater model. Predicted herbicide losses were sensitive to drain spacing and the organic carbon to water partition coefficient. K_(OC). The magnitude of the peak water and herbicide transport and their timing were simulated satisfactorily, although model performance was poor following a period of one month when snow covered the ground and precipitation was underestimated by the rain gauge. Total herbicide loads were simulated adequately by MACRO, suggesting that the field-scale lysimeter analogy is valid at this scale, although baseflow contributions to flow needed to be accounted for separately in order to adequately represent hydrological response.
机译：农药对水的流失会给环境管理带来问题，尤其是在流域中，这些流域的地表水被提取用于饮用水供应。通常无法确定不同转移途径（喷雾漂移，溢出，陆地流动和土壤淋溶）的相对作用，因此需要进行实验观察和建模，以确保在一定条件下能够理解过程。在这里，我们检查了在一个小（15.5公顷）源水子汇水区中丙酰胺和羧甲酰胺的运输情况，该汇水区以人工起伏的田地为主，地形起伏很大（地形梯度> 1:10）。具体来说，我们通过应用一维数学模型MACRO探索“场式溶渗仪”类比的有效性。尽管一维表示在其他地方已被证明是合理的，但受监视系统的规模和地形对许多基本假设构成了挑战。 MACRO考虑了两个相互作用的流动域：微孔和大孔。还可以包括地下排水管的影响。从主排水口流出的成分被确定为源自上坡可渗透的浅层含水层，该含水层使用简单的地下水模型表示。预测的除草剂损失对排水间距和有机碳对水的分配系数敏感。 K_（OC）。令人满意地模拟了峰值水和除草剂的迁移量及其时机，尽管在一个月的时间里积雪覆盖地面并且降雨仪低估了降雨后的模型性能很差。 MACRO对除草剂的总载量进行了充分的模拟，这表明在现场规模的溶渗仪模拟法在此规模上是有效的，尽管需要分别考虑基流对流量的贡献以充分表示水文响应。

著录项

  • 来源
    《Journal of Contaminant Hydrology》 |2013年第2期|67-81|共15页
  • 作者

    A. Tediosi; M.J. Whelan; K.R. Rushton; C. Gandolfi;

  • 作者单位

    Environmental Science and Technology Department. School of Applied Sciences, Cranfield University, College Road, Cranfield, Bedfordshire, MK43 0AL, UK,Dipartimento di Ingegneria Agraria, Universita degli Studi di Milano, via Celoria 2,20133 Milano, Italy;

    Environmental Science and Technology Department. School of Applied Sciences, Cranfield University, College Road, Cranfield, Bedfordshire, MK43 0AL, UK,Department of Geography, University of Leicester, Leicester, LEI 7RH, UK;

    Environmental Science and Technology Department. School of Applied Sciences, Cranfield University, College Road, Cranfield, Bedfordshire, MK43 0AL, UK;

    Dipartimento di Ingegneria Agraria, Universita degli Studi di Milano, via Celoria 2,20133 Milano, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pesticide; preferential; MACRO; drain; propyzamide; carbetamide; groundwater;

    机译：农药;优惠;宏;排水;丙酰胺羧酰胺地下水;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号