Nature‐based solutions enhance sediment and nutrient storage in an agricultural lowland catchment
نویسندگان
چکیده
In this paper, nature-based solutions (NBS) include: (1) natural flood management (NFM) interventions with a primary function of risk reduction but additional multiple benefits for water quality improvements through the mitigation diffuse pollution; and (2) ponds improvement. This study assesses ability these NBS to trap pollutants in run-off within two small (3.4 km2) agricultural catchments (Upper Thames, UK). The masses sediment, phosphorus, organic carbon trapped by 14 features (since construction 2–3 years previously) were quantified sediment surveying sampling. Streamflow suspended monitoring downstream enabled catchment yields be calculated. total 83 t 122 kg 4.3 carbon. Although footprint was <1% area, they drained 44% land area captured equivalent 15% yield, 10% phosphorus 8% particulate yield as monitored at outlet over period. Results reveal that accumulation rates influenced hydrological connectivity, greater constructed directly on streams (online ponds), those offline filled from overbank flows. low moderate observed suggests their floodwater storage potential is only likely significantly reduce medium term, necessitating maintenance after ~10 years. Compared topsoil each contributing enriched majority features, having average 50% higher 17% concentrations than surrounding arable soils, highlighting its value redistribution farmland. Monitoring results demonstrate NBS, including NFM, mitigate pollution lowland catchments.
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ژورنال
عنوان ژورنال: Earth Surface Processes and Landforms
سال: 2022
ISSN: ['1096-9837', '0197-9337']
DOI: https://doi.org/10.1002/esp.5483