Cost-effectiveness of targeted riparian management for sediment and total phosphorus considering convergent surface flow pathways: an Irish case study.

Discover geoscience Pub Date : 2025-01-01 Epub Date: 2025-02-19 DOI:10.1007/s44288-025-00125-6
Marc Stutter, Nikki Baggaley, Allan Lilly, Per-Erik Mellander, Mark E Wilkinson, Daire Ó hUallacháin
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Abstract

Diffuse pollution, globally affecting water quality by delivery of sediment, nutrients, pathogens and agro-chemicals from farmland, often has dominant flowpaths connecting to discrete channel delivery points, where field-edge mitigation can be optimally targeted. Accurate representation of field convergent flow paths (CFPs) can inform decisions on riparian mitigation planning. For three fields in Wexford, Ireland, we combined literature, catchment data, field-survey and spatial data methods to derive sediment and P exports (7.4-18.7 tonnes sediment/year and 0.9-6.9 kgP/year), runoff areas and watercourse delivery points (one to six CFPs per field). We moderated exports according to the ratio effective riparian buffer area: CFP contributing area and compared 3 mitigation levels. Low buffer to CFP area ratios highlighted limitations of narrow buffers for larger CFPs. Linear grass buffers (2 m, level 1) were predicted to retain 2-17% of sediment and 1-6% total P exports. Level 2, 5 m buffers targeting CFP delivery points to watercourses retained 4-38% of the sediment and 2-15% total P and improved cost-effectiveness two- to three- fold relative to level 1 (20-1761 Euros/tonne sediment and 650-5114 Euros/kgP for level 2). Level 3 scenarios (sediment traps and in-ditch filters; 49% and 33% retention of field sediment and P losses, respectively) improved cost-effectiveness (50-145 Euros/tonne sediment and 108-1498 Euros/kgP). Mitigation cost-effectiveness best informs policy and planning and landowner decisions by including surface runoff behaviour utilising spatial soil and topographic data, accompanied by walk-over ground truthing.

Supplementary information: The online version contains supplementary material available at 10.1007/s44288-025-00125-6.

考虑到收敛的地表流动路径,有针对性的河岸沉积物和总磷管理的成本效益:爱尔兰案例研究。
漫漫性污染通过从农田输送沉积物、营养物、病原体和农用化学品,在全球范围内影响水质,通常具有连接到离散渠道输送点的主要流动路径,在这些地方,可以最佳地针对田间边缘进行缓解。现场收敛流路径(CFPs)的准确表示可以为河岸缓解规划的决策提供信息。对于爱尔兰韦克斯福德的三个油田,我们结合文献、流域数据、实地调查和空间数据方法,得出沉积物和磷出口量(7.4-18.7吨沉积物/年和0.9-6.9 kgP/年)、径流区域和水道输送点(每个油田1至6个CFPs)。我们根据有效河岸缓冲面积:CFP贡献面积的比率缓和了出口,并比较了3种缓解水平。较低的缓冲区与CFP面积比率突出了较大CFP的窄缓冲区的局限性。线性草缓冲层(2 m, 1级)预计保留2-17%的沉积物和1-6%的总磷出口。针对CFP输送点的2.5米缓冲层保留了4-38%的沉积物和2-15%的总磷,相对于1级(20-1761欧元/吨沉积物和650-5114欧元/公斤),成本效益提高了两到三倍。3级方案(沉积物陷阱和沟里过滤器;现场沉积物和磷损失分别为49%和33%),提高了成本效益(50-145欧元/吨沉积物和108-1498欧元/公斤)。通过利用空间土壤和地形数据纳入地表径流行为,并辅以实地实地调查,缓解成本效益可以最好地为政策、规划和土地所有者决策提供信息。补充信息:在线版本包含补充资料,提供地址为10.1007/s44288-025-00125-6。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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