The Effect of Strip Bed Roughness on the Reaeration Rate Coefficient

Bicudo, J. R.; Giorgetti, Marcius F.

doi:10.2166/wst.1991.0649

Cited by 7 publications

(9 citation statements)

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“…Research about methane emissions from Amazonian Rivers came to similar conclusions [ Sawakuchi et al ., ], indicating the potential roles of sediment types on the carbon gases production in the river systems. On the other hand, sampling sites with fine‐grained sediments may experience lower surface turbulence due to the slight friction of the water passing over the stream bottom [ Bicudo and Giorgetti , ; Raymond and Cole , ], which is conducive to accumulation of dissolved CO 2 in the water body. The gas transfer velocities in sites with sand and silt sediments were significantly lower than those with boulder, cobble, and pebble (Figure S4), indicating that the slow gas evasion may account for the high p CO 2 in the fine‐grained sediments.…”

Section: Discussionmentioning

confidence: 99%

pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

Wang

Yuan

et al. 2017

JGR Biogeosciences

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Most rivers of the world are supersaturated with carbon dioxide (CO2), resulting in a large gas flux that has only recently been included in global carbon budgeting. However, little is known about CO2 emissions from urban river networks suffering anthropogenic disturbance in the context of global urbanization. We surveyed the partial pressure of carbon dioxide (pCO2) and CO2 flux from 84 locations in the Chongqing metropolitan river network, with an area of 5494 km2. The overall mean pCO2 and CO2 fluxes were 2152 µatm and 163.0 mol C m−2 yr−1, respectively, with 318.9 mol C m−2 yr−1 from rivers in the completely urban area and 49.6 mol C m−2 yr−1 from the least urbanized area. The riverine pCO2 level increased with the proportion of urban land, with 2–4 times higher CO2 flux in the urban areas than the remote rural ones. Sites with low flow velocity, narrow channel, and factitious bottom sediment appeared to be local hot spots of CO2 emission. The pCO2 and CO2 degassing was positively correlated with the nutrients content of surface water (i.e., nitrogen and phosphorus). Carbon was released to the atmosphere as CO2 from Chongqing metropolitan river network at a rate of 12.3 × 109 mol C yr−1. pCO2 exhibited a clear seasonality with lower values in March 2015 and June 2015 but a higher value in September 2014, which was coregulated by temperature, flood dilution, and in situ photosynthesis. The results highlight that rapid urbanization, with increasing nutrients loading and anthropogenic activities, will alter the carbon biogeochemical cycle in the terrestrial‐aqueous‐atmospheric ecosystem and then impact global CO2 budgets.

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Section: Discussionmentioning

confidence: 99%

pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

Wang

Yuan

et al. 2017

JGR Biogeosciences

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“…Na EESC-USP, Schulz & Giorgetti (1990) e Bicudo & Giorgetti (1991) ofereceram importantes contribuições referentes ao estudo da influência da rugosidade sobre o fenômeno da reaeração em corpos de água.…”

Section: Aos Amigos De Laboratório André Simões E Hemerson Pinheiro Punclassified

“…Numerosos experimentos (TSENG et al, 1974;NAKAGAWA, 1975;SMOOT, 1988;BICUDO & GIORGETTI, 1991;HICKS & MASON, 1991;JIRKA, 1991;MOOG, 1995;MOOG & JIRKA, 1995, 1999 Apenas para exemplificar um estudo de caso, apresenta-se uma breve descrição do trabalho realizado por Moog & Jirka (1999). Após a colisão, há perdas de energia localizadas e distorções no perfil de velocidades, afetando a maioria ou a totalidade da profundidade do escoamento -uma característica essencial de escoamentos com macro-rugosidades.…”

Section: Reoxigenação Superficialunclassified

“…Outras importantes contribuições para estudos relacionados à influência da hidrodinâmica de escoamentos com macro-rugosidades sobre o processo de transferência de gases na interface ar-água, foram apresentadas por Bicudo & Giorgetti (1991). Pode-se considerar que este trabalho é uma das principais referências do presente estudo.…”

Section: Reoxigenação Superficialunclassified

“…Com base no trabalho de Knight & Macdonald (1979), apresentado na seção 3.2.3 (Macro-Rugosidade em canais), Bicudo & Giorgetti (1991) …”

Section: Reoxigenação Superficialunclassified

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Estudo da influência de macro-rugosidades do leito de um canal hidráulico sobre o coeficiente de reoxigenação superficial

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A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective

Marx

Dušek

Jankovec

et al. 2017

Reviews of Geophysics

270

216

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Terrestrial carbon export via inland aquatic systems is a key process in the global carbon cycle. It includes loss of carbon to the atmosphere via outgassing from rivers, lakes, or reservoirs and carbon fixation in the water column as well as in sediments. This review focuses on headwater streams that are important because their stream biogeochemistry directly reflects carbon input from soils and groundwaters. Major drivers of carbon dioxide partial pressures (pCO2) in streams and mechanisms of terrestrial dissolved inorganic, organic and particulate organic carbon (DIC, DOC, and POC) influxes are summarized in this work. Our analysis indicates that the global river average pCO2 of 3100 ppmV is more often exceeded by contributions from small streams when compared to rivers with larger catchments (> 500 km2). Because of their large proportion in global river networks (> 96% of the total number of streams), headwaters contribute large—but still poorly quantified—amounts of CO2 to the atmosphere. Conservative estimates imply that globally 36% (i.e., 0.93 Pg C yr−1) of total CO2 outgassing from rivers and streams originate from headwaters. We also discuss challenges in determination of CO2 sources, concentrations, and fluxes. To overcome uncertainties of CO2 sources and its outgassing from headwater streams on the global scale, new investigations are needed that should include groundwater data. Such studies would also benefit from applications of integral CO2 outgassing isotope approaches and multiscale geophysical imaging techniques.

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The Effect of Strip Bed Roughness on the Reaeration Rate Coefficient

Cited by 7 publications

References 0 publications

pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

Estudo da influência de macro-rugosidades do leito de um canal hidráulico sobre o coeficiente de reoxigenação superficial

A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective

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The Effect of Strip Bed Roughness on the Reaeration Rate Coefficient

Cited by 7 publications

References 0 publications

pCO2 and CO2 fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

pCO2 and CO2 fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

Estudo da influência de macro-rugosidades do leito de um canal hidráulico sobre o coeficiente de reoxigenação superficial

A review of CO2 and associated carbon dynamics in headwater streams: A global perspective

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Product

Resources

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pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

pCO₂ and CO₂ fluxes of the metropolitan river network in relation to the urbanization of Chongqing, China

A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective