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

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

{"title":"Cost-effectiveness of targeted riparian management for sediment and total phosphorus considering convergent surface flow pathways: an Irish case study.","authors":"Marc Stutter, Nikki Baggaley, Allan Lilly, Per-Erik Mellander, Mark E Wilkinson, Daire Ó hUallacháin","doi":"10.1007/s44288-025-00125-6","DOIUrl":"10.1007/s44288-025-00125-6","url":null,"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.","PeriodicalId":520216,"journal":{"name":"Discover geoscience","volume":"3 1","pages":"13"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11839801/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143485474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Far-future hydrology will differentially change the phosphorus transfer continuum. 远未来的水文将不同程度地改变磷转移的连续性。

Discover geoscience Pub Date : 2024-01-01 Epub Date: 2024-09-12 DOI: 10.1007/s44288-024-00067-5

Per-Erik Mellander, Golnaz Ezzati, Conor Murphy, Phil Jordan, Simon Pulley, Adrian L Collins

{"title":"Far-future hydrology will differentially change the phosphorus transfer continuum.","authors":"Per-Erik Mellander, Golnaz Ezzati, Conor Murphy, Phil Jordan, Simon Pulley, Adrian L Collins","doi":"10.1007/s44288-024-00067-5","DOIUrl":"https://doi.org/10.1007/s44288-024-00067-5","url":null,"abstract":"Climate change is likely to exacerbate land to water phosphorus (P) transfers, causing a degradation of water quality in freshwater bodies in Northwestern Europe. Planning for mitigation measures requires an understanding of P loss processes under such conditions. This study assesses how climate induced changes to hydrology will likely influence the P transfer continuum in six contrasting river catchments using Irish national observatories as exemplars. Changes or stability of total P (TP) and total reactive P (TRP) transfer processes were estimated using far-future scenarios (RCP4.5 and RCP8.5) of modelled river discharge under climate change and observed links between hydrological regimes (baseflow and flashiness indices) and transfer processes (mobilisation and delivery indices). While there were no differences in P mobilisation between RCP4.5 and RCP8.5, both mobilisation and delivery were higher for TP. Comparing data from 2080 (2070-2099) with 2020 (2010-2039), suggests that P mobilisation is expected to be relatively stable for the different catchments. While P delivery is highest in hydrologically flashy catchments, the largest increases were in groundwater-fed catchments in RCP8.5 (+ 22% for TRP and + 24% for TP). The inter-annual variability of P delivery in the groundwater-fed catchments is also expected to increase. Since the magnitude of a P source may not fully define its mobility, and hydrological connections of mobilisation areas are expected to increase, we recommend identifying critical mobilisation areas to target future mitigation strategies. These are hydrologically connected areas where controls such as soil/bedrock chemistry, biological activity and hydrological processes are favourable for P mobilisation.","PeriodicalId":520216,"journal":{"name":"Discover geoscience","volume":"2 1","pages":"60"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11412086/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0