DOC and DBP precursors in western US watersheds and reservoirs

Nguyen, My Linh; Baker, Lawrence A.; Westerhoff, Paul

doi:10.1002/j.1551-8833.2002.tb09474.x

Cited by 29 publications

(13 citation statements)

References 23 publications

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“…3). These small, but statistically significant, changes could be due to photodegradation (Brooks et al, 2007;Kraus et al, 2011;Cory et al, 2014) coupled with autochthonous production of DOC (Chin et al, 1994;Nguyen et al, 2002). A similar decreasing SUVA 254 pattern from upstream to downstream of reservoirs was reported below Lake Powell and Lake Mead in the lower Colorado River basin (Miller, 2012).…”

supporting

confidence: 53%

Dam tailwaters compound the effects of reservoirs on the longitudinal transport of organic carbon in an arid river

Ulseth

Hall

2015

Biogeosciences

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Abstract. Reservoirs on rivers can disrupt organic carbon (OC) transport and transformation, but less is known how river reaches directly below dams contribute to OC processing. We compared how reservoirs and their associated tailwaters affected OC quantity and quality by calculating particulate OC (POC) and dissolved OC (DOC) fluxes, and measuring composition and bioavailability of DOC. We sampled the Yampa River near Maybell, Colorado, USA, and the Green River above and below Fontenelle and Flaming Gorge reservoirs as well as their respective tailwaters from early snowmelt to base flow hydrological conditions. In unregulated reaches (Yampa River, Green River above Fontenelle reservoir), DOC and POC concentrations increased with snowmelt discharge. POC and DOC concentrations also increased with stream discharge below Fontenelle reservoir, but there was no relationship between DOC and stream flow below Flaming Gorge reservoir. The annual load of POC was 3-fold lower below Fontenelle Reservoir and nearly 7-fold lower below Flaming Gorge reservoir, compared to their respective upstream sampling sites. DOC exported to downstream reaches from both reservoirs was less bioavailable, as measured with bioassays, than DOC upriver of the reservoirs. Lastly, tailwater reaches below the reservoirs generated OC, exporting potentially 1.6-2.2 g C m −2 d −1 of OC to downstream ecosystems. Therefore, the effect of impounding rivers on C fluxes is greater than the impact of the reservoirs alone given the additive effect of tailwater reaches below dams, which may produce and export comparable amounts of likely autochthonous carbon to downstream reaches.

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supporting

confidence: 53%

Dam tailwaters compound the effects of reservoirs on the longitudinal transport of organic carbon in an arid river

Ulseth

Hall

2015

Biogeosciences

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“…Other factors that clearly will affect reservoir DOM cycling include temperature, solar radiation, and residence time (Nguyen et al 2002, Mash et al 2004. For example, longer water residence times during periods where respiration exceeds photosynthesis may provide an opportunity for environmental processing of DOM, which may reduce the DBP precursor pool (Jack et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…In particular, both STHMFP and SHAAFP were notably lower in May compared to January. Nguyen et al (2002) also reported losses of THM and HAA precursors during reservoir residence time. Similarly, the Ohio River was found to be a net sink for THM precursors due to the predominance of bacterial respiration over photosynthesis (Jack et al 2002).…”

Section: Summer (Jul-sep)mentioning

confidence: 91%

“…Previous studies that have examined fluxes of DOC and DBP precursors in reservoirs and lakes have also found that reservoirs can act as either a source (Palmstrom et al 1988, Karimi and Singer 1991, Stepczuck et al 1998b or sink (Nguyen et al 2002, Garvey and Tobiason 2003, Bukavekas et al 2007). The time frame over which a study is conducted greatly impacts findings due to both seasonal and hydrologic controls on DOM budgets.…”

Section: Reservoir Dom Production Versus Consumptionmentioning

confidence: 94%

“…With increasingly strict regulations on the concentrations of DBPs permissible in tap water, there is an increasing need to understand the sources of DBP precursors and particularly management actions that can reduce their occurrence (Cooke and Kennedy 2001). Despite the prevalence and importance of reservoirs to water supply worldwide, few studies have looked at the sources and processing of DBP precursors in these systems, and most of the studies used a mass balance approach to determine net changes in DBP precursor loads (Palmstrom et al 1988, Stepczuck et al 1998b, Nguyen et al 2002, Bukavekas et al 2007). …”

mentioning

confidence: 99%

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How reservoirs alter drinking water quality: Organic matter sources, sinks, and transformations

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Bergamaschi

Hernes

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Lake and Reservoir Management

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How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

et al. 2021

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Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of DOM composition has led to an incomplete understanding of DOM and an underestimation of its role and importance in biogeochemical processes. A single sample of DOM can be composed of tens of thousands of distinct molecules. Each of these unique DOM molecules has their own chemical properties and reactivity or role in the environment. Human activities can modify DOM composition and recent research has uncovered distinct DOM pools laced with human markers and footprints. Here we review how land use change, climate change, nutrient pollution, browning, wildfires, and dams can change DOM composition which in turn will affect internal processing of freshwater DOM. We then describe how human-modified DOM can affect biogeochemical processes. Drought, wildfires, cultivated land use, eutrophication, climate change driven permafrost thaw, and other human stressors can shift the composition of DOM in freshwater ecosystems increasing the relative contribution of microbial-like and aliphatic components. In contrast, increases in precipitation may shift DOM towards more relatively humic-rich, allochthonous forms of DOM. These shifts in DOM pools will likely have highly contrasting effects on carbon outgassing and burial, nutrient cycles, ecosystem metabolism, metal toxicity, and the treatments needed to produce clean drinking water. A deeper understanding of the links between the chemical properties of DOM and biogeochemical dynamics can help to address important future environmental issues, such as the transfer of organic contaminants through food webs, alterations to nitrogen cycling, impacts on drinking water quality, and biogeochemical effects of global climate change.

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DOC and DBP precursors in western US watersheds and reservoirs

Cited by 29 publications

References 23 publications

Dam tailwaters compound the effects of reservoirs on the longitudinal transport of organic carbon in an arid river

Dam tailwaters compound the effects of reservoirs on the longitudinal transport of organic carbon in an arid river

How reservoirs alter drinking water quality: Organic matter sources, sinks, and transformations

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

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