A review of nitrogen and phosphorus export to waterways: context for catchment modelling

Drewry, John; Newham, Lachlan; Greene, Richard; Jakeman, Anthony J.; Croke, Barry

doi:10.1071/mf05166

Cited by 106 publications

(85 citation statements)

References 98 publications

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“…This includes how different materials, aquatic systems, processes, and scales can be modeled. It is beyond the scope of this review to strive for completeness with respect to the large number of specific particle transport models that have been presented before, especially since excellent reviews on transport models already exist for sediment [39][40][41][42], algae [43], microorganisms [44], and nanomaterials [45,46]. These reviews describe the present top models such as SWAT, WASP, HSPF, ANSWERS, and WEPP, all of which include suspended solids [39,42].…”

Section: Modeling the Transport Of Particles In Aquatic Systemsmentioning

confidence: 99%

Modeling the Fate and Transport of Plastic Debris in Freshwaters: Review and Guidance

Kooi

Besseling

Kroeze

et al. 2017

The Handbook of Environmental Chemistry

109

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Contamination with plastic debris has been recognized as one of today's major environmental quality problems. Because most of the sources are land based, concerns are increasingly focused on the freshwater and terrestrial environment. Fate and transport models for plastic debris can complement information from measurements and will play an important role in the prospective risk assessment of plastic debris. We review the present knowledge with respect to fate and transport modeling of plastic debris in freshwater catchment areas, focusing especially on nano-and microplastics. Starting with a brief overview of theory and models for nonplastic particles, we discuss plastic-specific properties, processes, and existing mass-balance-, multimedia-, and spatiotemporally explicit fate models. We find that generally many theoretical and conceptual approaches from This chapter has been externally peer reviewed.The original version of this chapter was revised. An erratum to this chapter can be found at DOI 10.1007/978-3-319-61615-5_14. models developed earlier for other types of (low density) particles apply also to plastic debris. A unique feature of plastic debris, however, is its combination of high persistence, low density, and extremely wide size distribution, ranging from the nanometer to the >cm scale. This causes the system behavior of plastic debris to show a far wider variety than most other materials or chemicals. We provide recommendations for further development of these models and implications and guidance for how fate and transport models can be used in a framework for the tiered risk assessment of plastic debris.

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Section: Modeling the Transport Of Particles In Aquatic Systemsmentioning

confidence: 99%

Modeling the Fate and Transport of Plastic Debris in Freshwaters: Review and Guidance

Kooi

Besseling

Kroeze

et al. 2017

The Handbook of Environmental Chemistry

109

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“…The Clyde River catchment is mostly undisturbed with riparian vegetation intact (Tozer et al, 2010); TN and TP concentrations here always fell within the range expected in an unpolluted estuary (ANZECC, 2000). The Bega River has been heavily cleared for agriculture (Brierley et al, 1999;Tozer et al, 2010), in particular dairy, which is widely associated with increased nutrient loading to catchments and estuaries (Drewry et al, 2006;Harris, 2001;Jones et al, 2009). …”

Section: Nutrient and Turbidity Dynamicsmentioning

confidence: 99%

Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics

Hitchcock

Mitrovic

2015

Estuarine, Coastal and Shelf Science

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Freshwater inflows play a key role in the delivery of organic carbon to estuaries. However, our understanding of the dynamics between discharge and carbon globally is limited. In this study we performed a 30-month monitoring study on the Bega and Clyde River estuaries, Australia, to understand the influence that discharge had on carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics. We hypothesised that 1) discharge would be the most important factor influencing carbon and nutrient concentrations, though during low flows chlorophyll a would also be positively related to carbon, 2) bacteria would be related to dissolved organic carbon (DOC), and chlorophyll a to temperature, nitrogen and phosphorus, and 3) that concentrations of carbon, nitrogen, phosphorus, bacterial biomass and chlorophyll a would be significantly different between large 'flood flows', smaller 'fresh flows' and base flow conditions. We found that discharge was always the most important factor influencing carbon and nutrient concentrations, and that primary production appeared to have little influence on the variation in DOC concentration even during base flow conditions. We suggest this relationship is likely due to highly episodic discharge that occurred during the study period. Bacteria were related to DOC in the lower estuary sites, but phosphorus in the upper estuary. We suggest this is likely due to the input of bioavailable carbon in the upper estuary leading bacteria to be P limited, which changes downstream to carbon limitation as DOC becomes more refractory. Chlorophyll a was positively related to temperature but not nutrients, which we suggest may be due to competition with bacteria for phosphorus in the upper estuary. Carbon, nitrogen and phosphorus concentrations were different under flood, fresh and base flow conditions, though these differences sometimes varied between estuary locations for different resources. Overall, the results demonstrate that discharge plays an important structuring role for carbon, nutrient and bacteria dynamics on the Bega and Clyde Rivers, and that the differences observed between flood and fresh inflows suggest that further study into the influence of differently sized inflow events is important.

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“…Indeed, the development of catchment models for sediment and nutrient loads has been based on the understanding gained from catchment, or at least sub-basin, assessments of the delivery, transport and processing of carbon, nitrogen and phosphorus through river networks (Williams and Melack, 1997;Harris, 2001;Biggs et al, 2004;Clark et al, 2004;Smith et al, 2005;Dodds and Oakes, 2006;Drewry et al, 2006). In general, this understanding suggests that nutrient and DOC concentrations are likely to increase longitudinally (i.e.…”

Section: Introductionmentioning

confidence: 98%

Longitudinal trends in river functioning: Patterns of nutrient and carbon processing in three Australian rivers

Hadwen

Fellows

Westhorpe³

et al. 2010

River Research & Apps

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Understanding longitudinal trends in the processing of carbon in rivers represents a much conceptualised, but infrequently tested, issue in aquatic ecology. In this study, we conducted concurrent longitudinal examinations of three very different rivers in eastern Australia to determine whether general principles in river functioning exist across broad geographic and hydrologic scales. Specifically, we examined trends in ambient basic water chemistry, nutrient concentrations, dissolved organic carbon (DOC), extracellular enzymes and food web structure and functioning and conducted bioassays to examine the degree to which DOC and nutrients limit heterotrophic bacterial respiration. These parameters revealed striking similarities across all sites. For metazoan communities, stable isotope analysis showed that algal carbon was the dominant basal resource utilised by consumers in all three rivers, suggesting that in-stream primary producers strongly underpin trophic pathways regardless of the position within a catchment or catchment condition. Analyses of extracellular enzymes revealed that microbial communities are actively utilising DOC at all sites. In fact, heterotrophic microbial respiration was strongly limited by DOC at all sites, with nutrient additions resulting in only relatively minor increases in respiration. Ultimately, this study demonstrates that DOC and algal carbon are critically important drivers of ecosystem processes in Australian riverine ecosystems. Furthermore, across all of our sites and rivers, ambient nutrient concentrations did not influence carbon processing. The consistent longitudinal trends in river function identified in this study provide useful insights for catchment managers and modellers with respect to identifiying key principles that underpin ecosystem functioning in Australian rivers.

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A review of nitrogen and phosphorus export to waterways: context for catchment modelling

Cited by 106 publications

References 98 publications

Modeling the Fate and Transport of Plastic Debris in Freshwaters: Review and Guidance

Modeling the Fate and Transport of Plastic Debris in Freshwaters: Review and Guidance

Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics

Longitudinal trends in river functioning: Patterns of nutrient and carbon processing in three Australian rivers

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