Transport of groundwater-borne phosphorus to Lake Bysjön, South Sweden

“…The VBS can be either grass or forested, and act as a zone in which runoff is captured and/or sediment trapped, inhibiting sediment‐bound nutrient transport to the stream. However, some studies have shown these VBS systems promote subsurface nutrient loading to streams (Osborne and Kovacic, 1993; Vanek, 1993; Cooper et al, 1995; Polyakov et al, 2005). Polyakov et al (2005) examined current research regarding riparian buffer systems and their ability to retain nutrients.…”

Section: Subsurface Nutrient Transport Studiesmentioning

confidence: 99%

Subsurface Transport of Phosphorus in Riparian Floodplains: Influence of Preferential Flow Paths

et al. 2009

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For phosphorus (P) transport from upland areas to surface water systems, the primary transport mechanism is typically considered to be surface runoff with subsurface transport assumed negligible. However, certain local conditions can lead to an environment where subsurface transport may be significant. The objective of this research was to determine the potential of subsurface transport of P along streams characterized by cherty or gravel subsoils, especially the impact of preferential flow paths on P transport. At a field site along the Barren Fork Creek in northeastern Oklahoma, a trench was installed with the bottom at the topsoil/alluvial gravel interface. Fifteen piezometers were installed surrounding the trench to monitor flow and transport. In three experiments, water was pumped into the trench from the Barren Fork Creek to maintain a constant head. At the same time, a conservative tracer (Rhodamine WT) and/or potassium phosphate solution were injected into the trench at concentrations at 3 and 100 mg/L for Rhodamine WT and at 100 mg/L for P. Laboratory flow-cell experiments were also conducted on soil material <2 mm in size to determine the effect that flow velocity had on P sorption. Rhodamine WT and P were detected in some piezometers at equivalent concentrations as measured in the trench, suggesting the presence of preferential flow pathways and heterogeneous interaction between streams and subsurface transport pathways, even in nonstructured, coarse gravel soils. Phosphorus transport was retarded in nonpreferential flow paths. Breakthrough times were approximately equivalent for Rhodamine WT and P suggesting no colloidal-facilitated P transport. Results from laboratory flow-cell experiments suggested that higher velocity resulted in less P sorption for the alluvial subsoil. Therefore, differences in flow rates between preferential and nonpreferential flow pathways in the field led to variable sorption. The potential for nutrient subsurface transport shown by this alluvial system has implications regarding management of similar riparian floodplain systems.

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“…LGD: 2.3 g m -2 year -1 in Lake Bysjön, Sweden (whole lake, Vanek 1993 Moore et al 2006), and 20.4 g m -2 year -1 in Waquoit Bay, Massachusetts (0.8 m broad beach face, Spiteri et al 2008). Note that P loads imported by SGD and LGD are about two orders of magnitude lower than N loads.…”

Section: Phosphorusmentioning

confidence: 99%

From submarine to lacustrine groundwater discharge

et al. 2015

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Submarine groundwater discharge (SGD) and its role in marine nutrient cycling are well known since the last decade. The freshwater equivalent, lacustrine groundwater discharge (LGD), is often still disregarded, although first reports of LGD are more than 50 years old. We identify nine different reasons why groundwater has long been disregarded in both freshwater and marine environments such as invisibility of groundwater discharge, the size of the interface and its difficult accessibility. Although there are some fundamental differences in the hydrology of SGD and LGD, caused primarily by seawater recirculation that occurs only in cases of SGD, there are also a lot of similarities such as a focusing of discharge to near-shore areas. Nutrient concentrations in groundwater near the groundwater-surface water interface might be anthropogenically enriched. Due to spatial heterogeneity of aquifer characteristics and biogeochemical processes, the quantification of groundwater-borne nutrient loads is challenging. Both nitrogen and phosphorus might be mobile in near-shore aquifers and in a lot of case studies large groundwater-borne nutrient loads have been reported.

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Transport of groundwater-borne phosphorus to Lake Bysjön, South Sweden

Cited by 20 publications

References 4 publications

Phosphorus in groundwater discharge – A potential source for lake eutrophication

Phosphorus in groundwater discharge – A potential source for lake eutrophication

Subsurface Transport of Phosphorus in Riparian Floodplains: Influence of Preferential Flow Paths

From submarine to lacustrine groundwater discharge

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