Phosphorus in the river corridor

Records, Rosemary M.; Wohl, Ellen; Arabi, Mazdak

doi:10.1016/j.earscirev.2016.04.010

Cited by 44 publications

(32 citation statements)

References 172 publications

(409 reference statements)

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“…Shallow GWL may connect with and mobilise more soil P as the pool and/or mobility of soil P decreases with depth, this is especially important as a higher soil labile inorganic P content has been measured at DS compared to MS. Organic riparian soils are known as internal sources of soluble reactive P (Dupas et al, 2017b;Gu et al, 2017;Records et al, 2016) due to poor retention capacities (Daly et al, 2001;Roberts et al, 2017) and their high proportion in a catchment has been strongly related to higher stream soluble reactive P concentrations (Dupas et al, 2018). At the MS zone, the soil showed lower soil labile inorganic P, DPS and higher total Fe contents than at DS possibly attenuating P in GW, also deeper at this location.…”

Section: Inter-annual Variability In Hydrological Transport To Groundmentioning

confidence: 99%

Contrasting physical controls on phosphorus transport to shallow groundwater at the hillslope scale

Fresne

Jordan

Mellander

et al. 2020

Preprint

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Abstract. In well-drained agricultural catchments transport of phosphorus (P) to groundwater (GW) can be controlled by static and dynamic factors and where surface water is GW fed this can lead to elevated P concentrations at the catchment outlet. In order to better control P transport along hillslopes a spatial and temporal conceptual view of P loss to GW must be developed. Initially in the present study, hillslope GW quality and rainfall data were examined for 2017 utilising a transect of piezometers at upslope (US), midslope (MS) and downslope (DS) locations. Two dominant scenarios emerged where GW P concentrations at DS and MS were simultaneously low or at other times DS became elevated and MS remained low. To examine the potential reasons for such scenarios, a one-dimensional hydrological transport model was developed for the unsaturated zone at DS and MS using rainfall and depth specific soil physical and hydraulic data. Results indicated that the DS zone facilitated transport (higher sand content, soil saturated hydraulic conductivity (Ks) and lower soil compaction) with higher modelled concentration peaks towards higher GW P concentrations whereas the MS zone had more potential to attenuate transport (lower soil Ks and higher soil compaction). Moreover, inter-annual variations of GW P concentrations at DS were related to rainfall and GW level. Hence, mitigation strategies should particularly (but not exclusively) focus on reducing P sources in the DS zone. This also indicates a need to identify hotspots of facilitated transport to shallow GW using finer scale soil properties surveys. Here, this is defined by low soil compaction, high sand content and soil Ks. However, challenges arise as soil properties can vary in time with soil management and with the difficulty of assessing the transport potential of deeper soil.

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Section: Inter-annual Variability In Hydrological Transport To Groundmentioning

confidence: 99%

Contrasting physical controls on phosphorus transport to shallow groundwater at the hillslope scale

Fresne

Jordan

Mellander

et al. 2020

Preprint

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“…Similar to N, the majority of P and sediment loading comes from excess runoff, particularly from headwater streams with limited BMPs (McFarland and Hauck, 1999). Adding LW to a stream channel can slow down the transport of sediment as well as the transport of P, which is often adsorbed to and transported by sediment (Records et al, 2016). However, as sediment settles within the channel, P can solubilize and be exported as soluble reactive P (Jones et al, 2015).…”

Section: Implications For Nutrient and Sediment Managementmentioning

confidence: 99%

Effects of large wood on floodplain connectivity in a headwater Mid-Atlantic stream

Keys

Govenor

Jones

et al. 2018

Ecological Engineering

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Large wood (LW) plays an essential role in aquatic ecosystem health and function. Traditionally, LW has been removed from streams to minimize localized flooding and increase conveyance efficiency. More recently, LW is often added to streams as a component of stream and river restoration activities. While much research has focused on the role of LW in habitat provisioning, geomorphic stability, and hydraulics at low to medium flows, we know little about the role of LW during storm events. To address this question, we investigated the role of LW on floodplain connectivity along a headwater stream in the Mid-Atlantic region of the United States. Specifically, we conducted two artificial floods, one with and one without LW, and then utilized field measurements in conjunction with hydrodynamic modeling to quantify floodplain connectivity during the experimental floods and to characterize potential management variables for optimized restoration activities. Experimental observations show that the addition of LW increased maximum floodplain inundation extent by 34%, increased floodplain inundation depth by 33%, and decreased maximum thalweg velocity by 10%. Model results demonstrated that different placement of LW along the reach has the potential to increase floodplain flow by up to 40%, with highest flooding potential at cross sections with high longitudinal velocity and shallow depth. Additionally, model simulations show that the effects of LW on floodplain discharge decrease as storm recurrence interval increases, with no measurable impact at a recurrence interval of more than 25 years.

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“…Nutrient dynamics and controls within watersheds vary considerably across landscape types and river corridors (Records, Wohl, & Arabi, 2016). Decades of urban, agricultural, and industrial development have altered biogeochemical cycling at local to global scales, leading to over-enrichment of nutrients in soils and aquatic systems.…”

Section: Landscape Connectivity Sinks Legacy Nutrients and Time Lagsmentioning

confidence: 99%

Nutrient control in water bodies: A systems approach

et al. 2020

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Nutrient pollution is considered a wicked problem because of its many significant economic, social, and environmental impacts that are caused by multiple pollutants originating from a variety of sources and pathways that exist across different temporal and spatial scales. Further adding to the difficulty in managing nutrient pollution is that it is a global, rural, and urban problem. A systems approach can improve nutrient management by incorporating technological, environmental, and societal considerations. This approach can consider valuation of monetized and nonmonetized cobenefits and the inherent consequences that make up a nutrient management program.In this introduction to a special collection of papers on nutrient pollution, we describe several systems frameworks that can be used to support nutrient management and evaluation of system performance as it relates to impacts, then highlight several attributes and barriers of nutrient management that point to the need for a systems framework, and conclude with thoughts on implementing systems approaches to nutrient management with effective community engagement and use of new technologies. This special collection presents results from a USEPA Science to Achieve Results (STAR) initiative to advance solutions to nutrient pollution through innovative and sustainable research and demonstration projects for nutrient management based on a systems approach. These studies evaluate several promising nutrient control technologies for stormwater or domestic wastewater, investigate the effects of agricultural conservation practices and stream restoration strategies on nutrient loads, and discuss several challenges and opportunities-social, policy, institutional, and financial considerationsthat can accelerate adoption of reliable technologies to achieve system-level outcomes.

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Phosphorus in the river corridor

Cited by 44 publications

References 172 publications

Contrasting physical controls on phosphorus transport to shallow groundwater at the hillslope scale

Contrasting physical controls on phosphorus transport to shallow groundwater at the hillslope scale

Effects of large wood on floodplain connectivity in a headwater Mid-Atlantic stream

Nutrient control in water bodies: A systems approach

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