Transport and delivery of suspended solids, nitrogen and phosphorus from various sources to freshwaters in the UK
作者： A.C. Edwards , P.J.A. Withers
DOI: 10.1016/J.JHYDROL.2007.10.053
关键词:
摘要: Summary Sources of nutrients and suspended solids (SS) are diverse in origin dynamic with respect to their transport pathways delivery surface groundwaters. Three broad source groups can be identified based on hydrological compositional characteristics. Consented discharges from point sources generally continuous highly concentrated relative receiving waters while non-point (diffuse) more dilute SS phosphorus particular tending have a high dependence upon (storm) events. A third group properties that intermediate include overflows septic systems, seepages farmyards or road/track runoff. This grouping automatically introduces strong temporal spatial variability the contribution individual make total quantity delivered freshwaters. either effluent volumes composition is not considered when predicting impacts, which significant headwater streams. Complete data for (especially intermediary group) also often lacking apportioning contributions catchments, being simply lumped into average export coefficients. Better definition would help accurately define different enable cost-effective river basin management planning as required under Water Framework Directive.
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