The farmgate phosphorus balance as a measure to achieve river and lake water quality targets

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 372, P. 123427 - 123427

Published: Nov. 21, 2024

Language: Английский

A unified and multi-scale Source:Pathway Priority Index for diffuse pollution management

Water Research, Journal Year: 2025, Volume and Issue: 279, P. 123418 - 123418

Published: March 1, 2025

Diffuse pollution is a global issue where management, particularly relating to phosphorus (P) transfers from agricultural land water, needs consider the magnitude of source pressure and connectivity hydrological pathway pressure. Combined, these pressures are considered as critical areas (CSAs) mitigation resources should be focused part landscape targeting. However, data requirements lack unified method have made this difficult implement at national scales. To overcome this, unique transferrable workflow presented for purpose three scales aid in prioritisation. First, macro- or basin-scale (100-600 km2) water quality (soluble reactive P-SRP) were used an initial indicator river basin scale Northern Ireland. Second, within macro-scale catchments, meso‑scale catchments (10-100 Water Framework Directive surveillance (n > 230) prioritised using validated relationship between long-term SRP soil test (STP-Olsen P) over 300,000 fields tested monitoring programme. These also screened persistent point ammonium (NH4) concentration data. Within each catchment, micro-scale (0.02 - 1.6 km2; 5th 95th percentile) identified (> 1.9 million) that combined summaries STP runoff risk metric was developed with high-resolution (16 points m-2) LiDAR derived topographic index (STI) into anonymised dimensionless Source:Pressure Priority Index (SPPI). Exemplar outputs shown detail weight equally, further emphasise pressure, vice versa, ensure advisory can allocated effectively. The SPPI more robust diffuse assessment management tool it recognises importance managing combination reducing pressures, rather than focusing on latter isolation. This will faster route reduction offer resilience mitigations become vulnerable weather patterns responses changing climate.

Language: Английский

Longitudinal Variability in the Oxygen Demand of Channel Bed Matrix Sediment in a UK Agricultural Catchment: Implications for Managing the Sediment Problem

River Research and Applications, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

ABSTRACT The presence of excess fine‐grained matrix sediment in channel beds can exert an oxygen demand this critical habitat for fish spawning and invertebrates. Therefore, reducing the bed through targeted intervention may deliver better cost–benefit from catchment management. To assess potential interventions to benefits, (SOD) was measured pools, riffles, bars, runs at nine sites along River Taw southwest UK. This river flows upland semi‐natural grassland, lowland agriculture with sewage treatment work discharges. SOD 5 days on < 25 μm fraction using a laboratory‐based dissolved probe. Samples sources were also analysed, colour‐based method used determine provenance sediment. did not vary significantly longitudinally or by riverine feature higher than its sources. Using settling isolate ultra‐fine showed highest concentrated here. entrapment autochthonous algal material is probable source high SOD. Since within‐stream productivity likely be challenging, combined approach targeting protection water erosion in‐channel measures increase exfiltration warranted. would reduce reduction pore spaces fine ingress, thereby limiting controlling

Language: Английский