A Rouse-based method to integrate the chemical composition of river sediments: Application to the Ganga basin

Lupker, Maarten; France‐Lanord, Christian; Lavé, Jérôme; Bouchez, Julien; Galy, Valier; Métivier, François; Gaillardet, Jérôme; Lartiges, Bruno; Mugnier, Jean‐Louis

doi:10.1029/2010jf001947

Cited by 158 publications

(190 citation statements)

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“…3). A similar discrepancy was found for sediment from the Ganges system (Lupker et al, 2011). A related observation was made by Bouchez et al (2010a): Rouse numbers derived from total SPM concentration depth-profiles were higher than Rouse numbers calculated from u * (obtained from ADCP water velocities) and w (estimated from D 50 of measured grain size distribution).…”

Section: Modeling the Grain Size Distribution Throughout The River Crsupporting

confidence: 52%

“…The mineralogical, chemical and isotopic compositions of river suspended sediments is grain-size dependent, as recently examined by Bouchez et al (2011), Garzanti et al (2010) and Lupker et al (2011). Consequently, the chemical composition of river sediments varies importantly with depth in the water column.…”

Section: Introductionmentioning

confidence: 98%

“…This vertical sorting leads to an increase in suspended particulate matter (SPM) concentration with depth, which has to be taken into account when estimating sediment fluxes of large rivers flowing in deep channels (e.g. Filizola, 2003;Laraque et al, 2009;Bouchez et al, 2010a;Lupker et al, 2011). In addition, vertical sorting leads to a coarsening of suspended sediments with depth.…”

Section: Introductionmentioning

confidence: 99%

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How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles

Bouchez

Lupker

Gaillardet

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Modeling the Grain Size Distribution Throughout The River Crsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles

Bouchez

Lupker

Gaillardet

et al. 2011

Geochimica et Cosmochimica Acta

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“…3). Al / Si is well correlated with grain size, which is controlled by hydraulic mineral sorting of sediments within the water column Lupker et al, 2011Lupker et al, , 2012. The variable Al / Si ratio of sediments in the water column is, to a first order, the result of binary mixing between Si-rich, coarse-grained quartz bottom sediments and Al-rich phylosilicates and clays that are relatively enriched in surface sediments.…”

Section: Total Cation Exchange Capacitymentioning

confidence: 99%

Impact of sediment–seawater cation exchange on Himalayan chemical weathering fluxes

2016

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Abstract. Continental-scale chemical weathering budgets are commonly assessed based on the flux of dissolved elements carried by large rivers to the oceans. However, the interaction between sediments and seawater in estuaries can lead to additional cation exchange fluxes that have been very poorly constrained so far. We constrained the magnitude of cation exchange fluxes from the Ganga-Brahmaputra river system based on cation exchange capacity (CEC) measurements of riverine sediments. CEC values of sediments are variable throughout the river water column as a result of hydrological sorting of minerals with depth that control grain sizes and surface area. The average CEC of the integrated sediment load of the Ganga-Brahmaputra is estimated ca. 6.5 meq 100 g −1 .The cationic charge of sediments in the river is dominated by bivalent ions Ca 2+ (76 %) and Mg 2+ (16 %) followed by monovalent K + (6 %) and Na + (2 %), and the relative proportion of these ions is constant among all samples and both rivers. Assuming a total exchange of exchangeable Ca 2+ for marine Na + yields a maximal additional Ca 2+ flux of 28 × 10 9 mol yr −1 of calcium to the ocean, which represents an increase of ca. 6 % of the actual river dissolved Ca 2+ flux. In the more likely event that only a fraction of the adsorbed riverine Ca 2+ is exchanged, not only for marine Na + but also Mg 2+ and K + , estuarine cation exchange for the GangaBrahmaputra is responsible for an additional Ca 2+ flux of 23 × 10 9 mol yr −1 , while ca. 27 × 10 9 mol yr −1 of Na + , 8 × 10 9 mol yr −1 of Mg 2+ and 4 × 10 9 mol yr −1 of K + are re-absorbed in the estuaries. This represents an additional riverine Ca 2+ flux to the ocean of 5 % compared to the measured dissolved flux. About 15 % of the dissolved Na + flux, 8 % of the dissolved K + flux and 4 % of the Mg 2+ are reabsorbed by the sediments in the estuaries. The impact of estuarine sediment-seawater cation exchange appears to be limited when evaluated in the context of the long-term carbon cycle and its main effect is the sequestration of a significant fraction of the riverine Na flux to the oceans. The limited exchange fluxes of the Ganga-Brahmaputra relate to the lower than average CEC of its sediment load that do not counterbalance the high sediment flux to the oceans. This can be attributed to the nature of Himalayan river sediment such as low proportion of clays and organic matter.

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“…Assessing paleomonsoon intensity is challenging and can be tracked with two approaches. First, the efficiency of sediment transport from the Himalaya to the Bay of Bengal is somewhat controlled by the seasonality and intensity of rainfall that trigger high river discharge (Lupker et al, 2011). This transport in turn exerts control on sediment fluxes to the Bay of Bengal that can be traced by accumulation rates.…”

Section: Calibration Of Neogene To Present Changesmentioning

confidence: 99%

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France‐Lanord

Spieß

Schwenk

et al. 2015

International Ocean Discovery Program Preliminary Report

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International Ocean Discovery Expedition 354 to 8°N in the Bay of Bengal drilled a seven site, 320 km long transect across the Bengal Fan. Three deep-penetration and an additional four shallow holes give a spatial overview of the primarily turbiditic depositional system that comprises the Bengal deep-sea fan. Sediments originate from Himalayan rivers, documenting terrestrial changes of Himalayan erosion and weathering, and are transported through a delta and shelf canyon, supplying turbidity currents loaded with a full spectrum of grain sizes. Mostly following transport channels, sediments deposit on and between levees while depocenters laterally shift over hundreds of kilometers on millennial timescales. During Expedition 354, these deposits were documented in space and time, and the recovered sediments have Himalayan mineralogical and geochemical signatures relevant for reconstructing time series of erosion, weathering, and changes in source regions, as well as impacts on the global carbon cycle. Miocene shifts in terrestrial vegetation, sediment budget, and style of sediment transport were tracked. Expedition 354 has extended the record of early fan deposition by 10 My into the late Oligocene.

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A Rouse-based method to integrate the chemical composition of river sediments: Application to the Ganga basin

Cited by 158 publications

References 96 publications

How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles

How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles

Impact of sediment–seawater cation exchange on Himalayan chemical weathering fluxes

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