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首页> 外文期刊>Hydrology and Earth System Sciences Discussions >Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape
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Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape

机译：由化学仪形状控制的小型植被处理系统中的农药峰值浓度降低

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摘要

Pesticides may impact aquatic ecosystems when entering water bodies. Measures for mitigation against pesticide inputs include vegetated treatment systems (VTSs). Some of these systems have very short hydraulic retention time ( ?1?h) but nevertheless manage to effectively reduce peak concentrations of contaminants as a result of dispersion. We hypothesize that the effect of dispersion on contaminant mitigation in VTSs depends on the shape of the contaminant input signal chemograph, which in turn is related to factors affecting contaminant mobilization in the contributing catchment. In order to test this hypothesis, we grouped chemographs of six contaminants originating from a viticultural catchment during 10 discharge events into clusters according to chemograph shape. We then compared peak concentration reduction and mass removal in a downstream VTS, both among clusters and in terms of compound properties and discharge dynamics. We found that chemograph clusters reflected combined effects of contaminant source areas, transport pathways, and discharge dynamics. While mass loss was subject to major uncertainties, peak concentration reduction rate was clearly related to chemograph clusters and dispersion sensitivity. These findings suggest that mitigation of acute toxicity in a VTS is stronger for compounds with sharp-peaked chemographs, whose formation is related to the contributing catchment and can be analyzed by chemograph clustering.
机译：农药可能会在进入水体时影响水生生态系统。对农药投入的缓解措施包括植被治疗系统（VTS）。其中一些系统具有非常短的液压保留时间（？1？H），但是由于分散而有效地降低污染物的峰值浓度。我们假设分散对VTS污染物缓解的影响取决于污染物输入信号化学仪的形状，这反过来与影响贡献集水区中污染物动员的因素有关。为了测试这一假设，我们根据化学仪形状在10个放电事件中分组了源自葡萄栽培集水区的六种污染物的培查仪。然后，我们将峰值浓度降低和质量比较在簇的下游VTS中，以及化合物性能和放电动力学。我们发现化学素集群反映了污染物源区域，运输途径和排放动力学的综合影响。虽然大众损失受到重大不确定性的影响，但峰浓度降低率明显与化学吸解光簇和分散敏感性有关。这些发现表明，VTS中急性毒性的减轻对于具有尖锐尖锐的培训仪的化合物更强，其形成与贡献集水区有关，并且可以通过化学簇分析。

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