Sediment accumulation rates and sediment dynamics using five different methods in a well-constrained impoundment: Case study from Union Lake, Michigan

Baskaran, M.; Miller, Carol J.; Kumar, Anupam; Andersen, Espen; Hui, Jennifer; Selegean, James P.; Creech, Calvin; Barkach, John H.

doi:10.1016/j.jglr.2015.03.013

Cited by 28 publications

(14 citation statements)

References 26 publications

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“…This value of ±2.4 year is the lowest value compared to a range of values, ±8.5e±13.1 yr (n ¼ 4) reported for Riley Dam in Michigan, USA Table 1). (Baskaran et al, 2014). The small s value (i.e., sharp peak) for the measured 137 Cs vertical profile suggests the following: i) the erosional input contributed to the sedimentary years in recent years are relatively small compared to the peak fallout era; and ii) the shape of the 137 Cs indicates that the diffusion and mixing of sediment due to biological and/or physical factors are negligible, as any effects would have resulted in broadened peak width at the maximum 137 Cs level.…”

Section: Inventories Of 210 Pb Xs and 137 Cs And Characterization Of mentioning

confidence: 99%

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Baskaran

Nix

Kuyper

et al. 2014

Journal of Environmental Radioactivity

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Section: Inventories Of 210 Pb Xs and 137 Cs And Characterization Of mentioning

confidence: 99%

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Baskaran

Nix

Kuyper

et al. 2014

Journal of Environmental Radioactivity

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“…In stable environments with uniform sediment accumulation rates, chronologies based on appropriate dating models are very reliable (Appleby, 2001). For example, in lakes where the sedimentation rate and 210 Pbex flux are both constant, the constant flux constant sedimentation model (CFCS) provides reliable dating results (Baskaran et al, 2015;Jweda and Baskaran, 2011;Krishnaswamy et al, 1971). The constant initial concentration model (CIC) assumes a constant initial 210 Pbex concentration regardless of any changes in the sedimentation rate (Binford, 1990;Pennington et al, 1976;Robbins and Edgington, 1975).…”

Section: Introductionmentioning

confidence: 99%

Determination of geochronology and sedimentation rates of shallow lakes in the middle Yangtze reaches using 210Pb, 137Cs and spheroidal carbonaceous particles

Chen

Qiao

McGowan

et al. 2019

CATENA

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Accurate chronologies for recent sediments of shallow lakes in the Yangtze floodplain are critical to calibrate proxy records for reconstructing environmental changes during the past century. This study presents the results of detailed 210 Pb analysis from eight lake sediment cores collected from the middle Yangtze reaches, southeast China. Unsupported 210 Pb activities generally declined exponentially with mass depth in the eight cores. The chronologies and sedimentation rates for the sediment cores were calculated using different 210 Pb-based mathematical models. The 137 Cs chronomarker (i.e. the 1963 fallout peak) and the spheroidal carbonaceous particle (SCP) chronomarker (i.e. the start of the rapid increase in 1970 AD) were selected to validate the 210 Pb dating. Sedimentation rates derived from different models were validated using historical data including lake area, arable land area, sediment discharge and reservoir volume in the Yangtze basin. The SCP-corrected CRS (constant rate of supply) model performs better than other models, based on validation using historical documents in the Yangtze basin. The 137 Cs chronomarker might be erroneous due to catchment-driven 137 Cs inputs from soil erosion and post-depositional diffusion. Both SCPs and 137 Cs are susceptible to inputs from catchment soil erosion, but SCPs showno apparent degradation and post-depositional changes in lake sediments. The SCP profile provides a relatively reliable chronomarker, which can be used for validating 210 Pb chronologies in these floodplain lakes. Generally, sedimentation rates in the eight lakes were less than 0.2 g cm -2 yr -1 before the 1930s, and then increased to a peak in the 1960s. Afterwards, sedimentation rates decreased and remained low after the 1980s.

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“…The geochemical behavior of 137 Cs is strikingly different between freshwater and seawater. 137 Cs is highly soluble (K d < 500) and very weakly particle reactive in marine waters and traces the water mass [ Cochran et al ., ; Smith et al ., ; Delfanti et al ., ], whereas it is highly particle reactive in freshwater, with K d values of 10 4 −10 6 cm 3 g −1 [e.g., Baskaran et al ., ]. This difference between freshwater and seawater is mainly due to differences in the concentrations of K in these waters.…”

Section: Discussionmentioning

confidence: 99%

“…However, none of these studies obtained a 137 Cs profile similar to the global fallout cure. 137 Cs have been widely used as a chronometer in freshwater systems [e.g., Evans et al, 1983;Davis et al, 1984;Baskaran et al, 2014Baskaran et al, , 2015. The majority of the sedimentary particulate matter discharged by the Changjiang River are ''tagged'' with 137 Cs and deposited mostly in the nearshore closest to the river mouths.…”

Section: Cs In MM As a Tracer Of The Transport Of Mm In The Ecsmentioning

confidence: 99%

Mobile mud dynamics in the East China Sea elucidated using ²¹⁰Pb, ¹³⁷Cs, ⁷Be, and ²³⁴Th as tracers

Wang

Baskaran

et al. 2016

JGR Oceans

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“Mobile mud” (MM), which has fine grain size distribution (>90% clay + silt, and <5% sand) and high porosity (≥0.50), plays an important role in the biogeochemical cycles in the estuarine areas and the inshore shelf. A suite of MM samples from the coastal area of the East China Sea (ECS) was collected in spring and summer of 2011 to observe their spatial and temporal distribution, grain size, and radionuclides concentrations. The MM thickness ranged from 0.5 to 11 cm (average: 2.2 cm (May) and 3.9 cm (August)). The thick mud layer is mainly distributed along the coast, with an area of 2.2 × 104 km2 in May and 1.5 × 104 km2 in August, with corresponding masses of 8.8 × 108 and 7.8 × 108 t, respectively. The estimated masses of MM are considerably larger than the annual sediment discharge mass of the Changjiang River. The distribution of 137Cs inventories in MM indicates that 137Cs can be effectively utilized as a transport tracer of MM in the river‐dominated estuaries and coastal areas. The higher inventories of 7Be in MM in the river mouth in spring are attributed to higher depositional flux and higher sediment discharge. The ratio of the MM inventory of 234Thex/production in the overlying water column of >2.5 in south inshore indicates that the sediment focusing resulted in the increased mass flux. The residence time of MM is estimated as 3–6 years both by mass balance of MM and 210Pbex in MM.

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Sediment accumulation rates and sediment dynamics using five different methods in a well-constrained impoundment: Case study from Union Lake, Michigan

Cited by 28 publications

References 26 publications

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Determination of geochronology and sedimentation rates of shallow lakes in the middle Yangtze reaches using 210Pb, 137Cs and spheroidal carbonaceous particles

Mobile mud dynamics in the East China Sea elucidated using ²¹⁰Pb, ¹³⁷Cs, ⁷Be, and ²³⁴Th as tracers

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Sediment accumulation rates and sediment dynamics using five different methods in a well-constrained impoundment: Case study from Union Lake, Michigan

Cited by 28 publications

References 26 publications

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Determination of geochronology and sedimentation rates of shallow lakes in the middle Yangtze reaches using 210Pb, 137Cs and spheroidal carbonaceous particles

Mobile mud dynamics in the East China Sea elucidated using 210Pb, 137Cs, 7Be, and 234Th as tracers

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Resources

About

Mobile mud dynamics in the East China Sea elucidated using ²¹⁰Pb, ¹³⁷Cs, ⁷Be, and ²³⁴Th as tracers