Changes in the geochemistry of fluvial sediments after dam construction (the Chrudimka River, the Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13520%2F18%3A43893940" target="_blank" >RIV/44555601:13520/18:43893940 - isvavai.cz</a>

Alternative codes found

RIV/61388980:_____/18:00494119 RIV/61989592:15310/18:73590927

Result on the web

<a href="http://dx.doi.org/10.1016/j.apgeochem.2018.09.012" target="_blank" >http://dx.doi.org/10.1016/j.apgeochem.2018.09.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apgeochem.2018.09.012" target="_blank" >10.1016/j.apgeochem.2018.09.012</a>

Result language

angličtina

Original language name

Changes in the geochemistry of fluvial sediments after dam construction (the Chrudimka River, the Czech Republic)

Original language description

The Sec Dam Reservoir on the Chrudimka River (the Czech Republic) was studied as a possible barrier for the transport of solid particles related to fluvial pollution. To understand the damming-triggered changes in the sediment lithology and geochemistry and to establish the pollution chemostratigraphy of the reservoir deposits, we first characterized the grain-size control on the sediment composition, including concentrations of risk elements Cu, Ni, Pb, and Zn. To that end, we first examined the chemical composition of the sieved size fractions of sediments, and then we compared the grain-size parameters obtained by granulometry with the geochemical composition using either scatter plots or a compositional regression with functional covariates in framework of Bayes spaces. The onset of deposition in the dam reservoir outside of the inflow delta is marked by three major changes: (1) a decrease in the grain size and a corresponding increase in Al/Si and Ti and a decrease in K and Ca, (2) enhanced retention of the finest particulates, especially Fe and Mn, and (3) enhanced concentration of risk elements originating from local industry in the city of Hlinsko that started nearly coevally with the dam construction. In the inflow delta, these changes are not so straightforward: the lithology of the deltaic deposits resembles that of the pre-dam fluvial sediments, except for the fact they are polluted, although the pollution stratigraphy is poorly preserved. The peak of polycyclic aromatic hydrocarbons (PAHs) in the dam reservoir was found near the onset of the dam deposition. We found that Fe is the best-performing reference (normalizing) element for the geochemical background functions (GBFs), although Ti would provide better grain-size correction; clearly, post-depositional geochemical reactions also play a role. GBFs were used to calculate local enrichment factors (LEF) and show that the dam construction suppressed the downstream transport of Cu, Ni, and Zn pollution by more efficient retention and trapping of fine sediment components including Fe oxides, which are otherwise transported through the floodplain.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

<a href="/en/project/GA17-06229S" target="_blank" >GA17-06229S: Sedimentary history of dam reservoirs as anthropogenic barriers in river systems: from sediment budget to fate of pollutants</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Geochemistry

ISSN

0883-2927

e-ISSN

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Volume of the periodical

2018

Issue of the periodical within the volume

98

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

94-108

UT code for WoS article

000450301100011

EID of the result in the Scopus database

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