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Friedl, Gabriela; Wüest, Alfred

doi:10.1007/s00027-002-8054-0

Cited by 394 publications

(87 citation statements)

References 52 publications

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“…Impounding water upstream of dams is known to change the nutrient balance of a river system, as reservoir sediments can act as efficient sink for P (Friedl and Wüest 2002). Globally, the mass of TP trapped in reservoirs nearly doubled (42 Gmol·year −1 ) between 1970 and 2000 and about 17% of the total TP load of rivers is expected to be retained in sediments of reservoirs by 2030 (Maavara et al 2015).…”

Section: Understudied Ecosystemsmentioning

confidence: 99%

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

197

133

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Many physical, chemical, and biological processes in freshwater ecosystems mobilize the nutrient phosphorus (P) from sediments, which in turn may contribute to the formation of harmful algal blooms. Here, we critically reviewed internal P loading in Canadian fresh waters to understand the geographic patterns and environmental drivers of this important process. From 43 publications, we consolidated 618 estimates of internal P loading from Canadian freshwater ponds, lakes, reservoirs, and coastal wetlands (n = 70). Expressed in terms of total P, short-term gross rates in sediment samples (L gross ) ranged from −27 to 54 mg·m −2 ·day −1 (n = 461), while long-term net rates in whole ecosystems (L net ) ranged from −1694 to 10 640 mg·m −2 ·year −1 (n = 157). The main environmental drivers of this variation were oxygen, pH, geology, and trophic state. Internal P loading tended to be higher during the open-water season and most prominent in small prairie lakes. Priorities for future research on internal P loading should include resolving methodological problems, assessing the relative importance of different mechanisms, examining the influence of anthropogenic activities, and quantifying rates in understudied ecosystems. Résumé :De nombreux processus physiques, chimiques et biologiques dans les écosystèmes d'eau douce mobilisent le phosphore (P), un élément nutritif, des sédiments, ce qui peut favoriser la formation de fleurs d'eau néfastes. Nous avons effectué un examen critique de l'apport interne de P dans les plans d'eau douce canadiens afin de comprendre les motifs de répartition géographique et les facteurs environnementaux qui influent sur cet important processus. À la lumière de 43 publications, nous avons colligé 618 estimations de l'apport interne de P d'étangs, de lacs, de réservoirs et de milieux humides littoraux d'eau douce canadiens (n = 70). Exprimés en termes de P total, les taux d'apport de P à court terme pour les échantillons de sédiments (L gross ) vont de −27 à 54 mg·m -2 ·jour -1 (n = 461), alors que les taux nets à long terme à l'échelle de l'écosystème (L net ) vont de −1694 à 10 640 mg·m -2 ·an -1 (n = 157). Les principaux facteurs environnementaux influant sur ces variations sont l'oxygène, le pH, la géologie et l'état trophique. L'apport interne de P tend à être plus élevé durant la période d'eau libre et le plus marqué dans les petits lacs de prairie. La priorité des travaux futurs sur l'apport interne de P devrait porter sur la résolution de problèmes méthodologiques, l'évaluation de l'importance relative de différents mécanismes, l'examen de l'influence des activités humaines et la quantification des taux dans les écosystèmes sous-étudiés. [Traduit par la Rédaction]

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Section: Understudied Ecosystemsmentioning

confidence: 99%

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

197

133

View full text Add to dashboard Cite

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“…Additionally, some studies have focussed on the trapping efficiency of reservoirs and the effects on hydrograph, sediment and nutrient transport as well as the overall ecological conditions of the dammed watersheds (Friedl and Wüest, 2002;Gubiani et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Dams reduce the water transport and consequently decrease the turbidity providing favourable conditions for enhancing particles settling and in situ primary production. More phytoplankton might reduce particulate and dissolved nutrient loads across the flooded river stretch by processes such as nutrient uptake followed by sedimentation and adsorption on suspended matter (Friedl and Wüest 2002); Harrison et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

The influence of castanhão reservoir on nutrient and suspended matter transport during rainy season in the ephemeral Jaguaribe river (CE, Brazil)

et al. 2013

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Measurements of nutrient and suspended matter concentrations and loads entering and leaving the Castanhão reservoir during the rainy season were carried out to assess the influence of this large reservoir on land-sea fluvial transport in the ephemeral Jaguaribe river basin. Spatial variation indicated statistically significant attenuation of concentrations only for total phosphorous and suspended matter across the reservoir. Strong retention of nutrients and suspended matter loads by the reservoir was observed with average trapping efficiency of 89% for dissolved silicon, 98% of soluble reactive phosphorus, 71% for ammonium, 87% for total nitrogen, 98% for total phosphorus and 97% for suspended matter compared to the reservoir inflow. The dam operational procedure defined by the ephemeral conditions of the river reduced water releases compared to reservoir inflow and induced strong retention of nutrient and suspended matter loads within the reservoir when fluvial transfer occurs in this semiarid watershed.Keywords: dam, semi-arid, nutrient budget, sediment retention, impoundment.Influência do açude Castanhão no transporte de nutrientes e materiais em suspensão durante a estação chuvosa no intermitente rio Jaguaribe (CE, Brasil) ResumoMedidas de concentrações e fluxos de nutrientes e material particulado em suspensão de entrada e saída do Açude Castanhão foram efetuadas para determinar a influência de um grande reservatório no transporte fluvial entre o continente e o oceano na bacia hidrográfica intermitente do Rio Jaguaribe. A variação espacial indicou uma atenuação estatisticamente significativa ao longo do reservatório somente para as concentrações de fósforo total e material particulado em suspensão. Os resultados indicam uma forte retenção de nutrientes e do material particulado em suspensão com eficiências de retenção de 89% para sílica dissolvida, 98% para fósforo solúvel reativo, 71% para amônia, 87% para nitrogênio total, 98% para fósforo total e 97% para o material particulado em suspensão em relação aos fluxos de entrada no reservatório. A rotina de operação da barragem definida pela condição intermitente do Rio Jaguaribe reduz a descarga de água comparada com a entrada no reservatório e induz forte retenção do fluxo fluvial de nutrientes e material particulado em suspensão pelo reservatório.Palavras-chave: barragem, semiárido, balanço de nutrientes, retenção de sedimentos, represamento de águas.

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“…Among the multiple environmental, ecological, biogeochemical and social impacts associated with reservoir development [Rosenberg et al, 1995[Rosenberg et al, , 1997Vörösmarty et al, 1997;Friedl and Wüest, 2002], the emission of carbon (C) gases is steadily becoming a focus of both scientific and economic concerns. Hydroelectric production was until quite recently, considered for all practical purposes as relatively C-neutral with close to zero-emission [Hoffert et al, 1998;Victor, 1998], but there is mounting evidence that hydroelectric reservoirs may in fact emit significant amounts of both carbon dioxide (CO 2 ) and methane (CH 4 ).…”

Section: Introductionmentioning

confidence: 99%

The net carbon footprint of a newly created boreal hydroelectric reservoir

Teodoru

Bastien

Bonneville

et al. 2012

Global Biogeochemical Cycles

143

102

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[1] We present here the first comprehensive assessment of the carbon (C) footprint associated with the creation of a boreal hydroelectric reservoir (Eastmain-1 in northern Québec, Canada). This is the result of a large-scale, interdisciplinary study that spanned over a 7-years period (2003)(2004)(2005)(2006)(2007)(2008)(2009)), where we quantified the major C gas (CO 2 and CH 4 ) sources and sinks of the terrestrial and aquatic components of the pre-flood landscape, and also for the reservoir following the impoundment in 2006. The pre-flood landscape was roughly neutral in terms of C, and the balance between pre-and post-flood C sources/sinks indicates that the reservoir was initially (first year post-flood in 2006) a large net source of CO 2 (2270 mg C m À2 d À1) but a much smaller source of CH 4 (0.2 mg C m À2 d À1). While net CO 2 emissions declined steeply in subsequent years (down to 835 mg C m À2 d À1 in 2009), net CH 4 emissions remained constant or increased slightly relative to pre-flood emissions. Our results also suggest that the reservoir will continue to emit carbon gas over the long-term at rates exceeding the carbon footprint of the pre-flood landscape, although the sources of C supporting these emissions have yet to be determined. Extrapolation of these empirical trends over the projected life span (100 years) of the reservoir yields integrated long-term net C emissions per energy generation well below the range of the natural-gas combined-cycle, which is considered the current industry standard.

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Untitled

Cited by 394 publications

References 52 publications

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

The influence of castanhão reservoir on nutrient and suspended matter transport during rainy season in the ephemeral Jaguaribe river (CE, Brazil)

The net carbon footprint of a newly created boreal hydroelectric reservoir

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