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首页> 外文期刊>The Science of the Total Environment >Modeling effectiveness of agricultural BMPs to reduce sediment load and organophosphate pesticides in surface runoff
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Modeling effectiveness of agricultural BMPs to reduce sediment load and organophosphate pesticides in surface runoff

机译：模拟农业BMP减少地表径流中沉积物负荷和有机磷酸盐农药的有效性

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摘要

Quantifying effectiveness of agricultural BMPs at the watershed scale is a challenging issue, requiring robust algorithms to simulate not only the agricultural production system but also pollutant transport and fate. This research addresses the challenge to simulate performances of BMPs in reducing organophosphates (OPs) runoff at the watershed scale. The SWAT model is calibrated and validated following a sensitivity analysis combining Latin Hypercube sampling and One-factor-At-a-Time simulation. The calibrated model is then applied in the Orestimba Creek Watershed to simulate BMPs including buffer strips, sediment ponds, vegetated ditches, use reduction, and their combinations. BMP simulation suggested that sediment ponds trap 54-85% of sediment from field runoff, but less than 10% of dissolved diazinon and chlorpyrifos. Use reduction can reduce pesticide load in a close-to-linear fashion. Effectiveness of vegetated ditches and buffers depends on their physical dimension and vegetation cover. Combining individual BMPs provides enhanced mitigation effects. The combination of vegetated ditches, buffer strips and use reduction decreases diazinon and chlorpyrifos load by over 94%. This study has suggested that the SWAT model reasonably predicts BMP effectiveness at the watershed scale. Results will assist decision making in implementing BMPs to reduce pesticide loads in surface runoff.
机译：在流域范围内量化农业BMP的有效性是一个具有挑战性的问题，需要鲁棒的算法不仅要模拟农业生产系统，还要模拟污染物的运输和命运。这项研究解决了模拟BMP在分水岭规模上减少有机磷酸盐（OPs）径流方面的挑战。在结合拉丁文Hypercube采样和一次因子仿真的敏感性分析之后，对SWAT模型进行了校准和验证。然后将校准后的模型应用到Orestimba Creek流域中，以模拟BMP，包括缓冲带，沉积池，植被沟渠，使用量减少及其组合。 BMP模拟表明，沉淀池从田间径流中捕获了54-85％的沉积物，但溶解的二嗪农和毒死rif少于10％。减少使用量可以以接近线性的方式减少农药负荷。植被沟渠和缓冲带的有效性取决于它们的物理尺寸和植被覆盖度。结合单独的BMP可以增强缓解效果。植被沟渠，缓冲带和使用量的减少相结合，可使二嗪农和毒死py的负载量减少94％以上。这项研究表明，SWAT模型可以合理地预测分水岭规模的BMP有效性。结果将有助于制定实施BMP的决策，以减少地表径流中的农药负荷。

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