Depositional rates and dating techniques of modern deposits in the Brno reservoir (Czech Republic) during the last 70 years

Nehyba, Slavomír; Nývlt, Daniel; Schkade, Uwe; Kirchner, Gerald; Franců, Eva

doi:10.1007/s10933-010-9478-5

Cited by 24 publications

(12 citation statements)

References 37 publications

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“…Cesium-137 deposition rates in the environment showed a pronounced maximum in 1963. Because 137 Cs is strongly bound to clay minerals, the 1963 weapons' testing peak is preserved in most sediments (Nehyba et al 2011). A further time marker that was more pronounced than the 1963 peak originates from the Chernobyl reactor accident (former Ukrainian SSR of Soviet Union) in 1986.…”

Section: Core Datingmentioning

confidence: 99%

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Kleeberg

Neyen

Schkade

et al. 2015

Environ Sci Pollut Res

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Glacial kettle holes in young moraine regions receive abundant terrigenous material from their closed catchments. Core chronology and sediment accumulation were determined for two semi-permanent kettle holes, designated RG and KR, on arable land close to the villages of Rittgarten and Kraatz, respectively, in Uckermark, NE Germany. Core dating ((210)Pb, (137)Cs) revealed variable sediment accretion rates through time (RG 0.4-23.1 mm a(-1); KR 0.2-35.5 mm a(-1)), with periods of high accumulation corresponding to periods of intensive agricultural activity and consequent erosional inputs from catchments. Sediment composition (C, N, P, S, K, Ca, Fe, Mn, Zn, Cu, Mo, Pb, Cd, Zr) was used to determine sediment source and input processes. At RG, annual P input increased from 0.65 kg ha(-1) in the early nineteenth century to 1.67 kg ha(-1) by 2013. At KR, P input increased from 0.6 to 4.1 kg ha(-1) over the last century. There was a concurrent increase in Fe input in both water bodies. Thus, Fe/P ratios showed no temporal trend and did not differ between RG (18.5) and KR (18.4), indicating similar P mobility. At RG, the S/Fe ratio increased from 0.4 to 2.3, indicating more iron sulphides and thus higher P availability, coinciding with high coverage of duckweed (Spirodela polyrhiza (L.)) and soft hornwort (Ceratophyllum submersum L.). At KR, however, this ratio remained low and relatively unchanged (0.3 ± 0.4), indicating more efficient Fe-P binding and lower hydrophyte productivity. Trends in sediment composition indicate a shift towards eutrophication in both kettle holes, but with differences in timing and magnitude. Other morphologically similar kettle holes in NE Germany that are prone to erosion could have been similarly impacted but may differ in the extent of sediment infilling and degradation of their ecological functions.

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Section: Core Datingmentioning

confidence: 99%

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Kleeberg

Neyen

Schkade

et al. 2015

Environ Sci Pollut Res

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“…Humphries et al, 2010;Mizugaki et al, 2006;Saravan Kumar et al, 1999;Yan et al, 2002) reveal two more or less distinct peaks of 137 Cs concentration -at c. ad 1963 (maximum intensity of thermonuclear weapon tests) and at c. ad 1986 (Chernobyl catastrophic explosion). The most pronounced peak of the 137 Cs concentration in Central Europe is usually related to atmospheric fallout from the Chernobyl catastrophic explosion of ad 1986 (Nehyba et al, 2011). Regarding the position of the ad 1986 peak at a depth of 20 cm, the average sedimentation rate of the last three decades is c. 0.83 cm/yr.…”

Section: Chronology and Sedimentation Rates Of The Impoundmentmentioning

confidence: 99%

Late-Holocene evolution of a floodplain impounded by the Smrdutá landslide, Carpathian Mountains (Czech Republic)

et al. 2012

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Landslides affecting narrow mountainous valleys might significantly determine sedimentation dynamics of floodplains. We present here a detailed study of the sedimentary archive within a landslide-controlled impounded floodplain (Smrdutá site, Czech Flysch Carpathians) using geochronological ( 14 C and 137 Cs), sedimentological and pollen evidence. A sedimentary sequence deposited above the landslide dam points to three highly discontinuous and instantaneous depositional events dated to 4.6 and 2.0 cal. ka BP, whereas the last cycle started approximately in the 17-18th centuries and has continued to recent times. Such sedimentary pulses characterized by the duration of several decades to a few centuries originated as a consequence of the blockage and/or reduction of the valley floor width by successive long-runout landslides from a slope formed by tectonically and lithologically anisotropic flysch bedrock. Stages of mass movement activity revealed by the Smrdutá landslide correlate well with major humid late-Holocene oscillations suggesting its high sensitivity to century-scale climatic deteriorations. The character of lithological units forming individual sedimentary pulses, erosional hiatuses and sedimentary traces caused by the July 1997 extreme flood indicate a decisive role of large flood events during accretion and erosion of the floodplainimpounded section.

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“…These overall errors of 1 standard deviation fall into the normal range of most studies; however, some studies had difficulty using 210 Pb analysis for dating their recent sediments with nearby uranium ore mining operations. For example, Nehyba et al (2011) found little relationship between concentrations of unsupported 210 Pb and sediment core depth due to the likely source of the parent isotope ( 238 U) from the nearby uranium mining activity, whereas in all of our lakes (impact and reference) there was exponential decay of unsupported 210 Pb activity with depth, and the concentration of 210 Pb in the impact lakes was similar to those seen in the reference lakes ( Fig. 2).…”

Section: Chronologymentioning

confidence: 59%

Enrichment of uranium, arsenic, molybdenum, and selenium in sediment cores from boreal lakes adjacent to northern Saskatchewan uranium mines

Laird

Das

Cumming

2014

Lake and Reservoir Management

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Laird KR, Das B, Cumming BF. 2014. Enrichment of uranium, arsenic, molybdenum, and selenium in sediment cores from boreal lakes adjacent to northern Saskatchewan uranium mines. Lake Reserv Manage. 30:344-357. Assessment of flux rates and concentrations of potentially toxic elements in sediment cores from 5 lakes adjacent to the McClean Lake uranium mines in northern Saskatchewan (impact lakes) compared to results from a set of 5 upwind and distant lakes (reference lakes) clearly indicated enrichment of several elements in lakes close to the mining operations. The flux of uranium to the sediments of the 5 impact lakes was significantly higher post-1960 from the mean pre-1960 background conditions by 1.5 to 23 times. Flux rates of arsenic, molybdenum, and selenium also indicated significant enrichment from background conditions in the majority of the impact lakes. In contrast, large and significant increases in flux only occurred in 1 of the 5 reference lakes for arsenic. The highest levels of enrichment were found in the 3 lakes either in closest proximity to the tailings management facility, waste-rock piles, or downstream from the treated effluent management system. High flux rates and concentrations of elements such as arsenic and vanadium in both the reference lakes and in pre-mining samples of the impact lakes indicated that potentially toxic elements can occur naturally in this region. Sediment core analyses of elemental flux and concentration in both reference lakes and pre-1960 conditions in the impact lakes provided an estimate of natural background conditions. Our data suggest that the McClean Lake mine may be a source for the enrichments of toxic elements in the lakes in close proximity to the mining operations.

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Depositional rates and dating techniques of modern deposits in the Brno reservoir (Czech Republic) during the last 70 years

Cited by 24 publications

References 37 publications

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Late-Holocene evolution of a floodplain impounded by the Smrdutá landslide, Carpathian Mountains (Czech Republic)

Enrichment of uranium, arsenic, molybdenum, and selenium in sediment cores from boreal lakes adjacent to northern Saskatchewan uranium mines

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