Migration of risk elements within the floodplain of the Litavka River, the Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F19%3A00500190" target="_blank" >RIV/61388980:_____/19:00500190 - isvavai.cz</a>

Alternative codes found

RIV/67985831:_____/19:00500190 RIV/44555601:13520/19:43894490 RIV/00216208:11310/19:10397037 RIV/61989592:15310/19:73600613

Result on the web

<a href="http://hdl.handle.net/11104/0294721" target="_blank" >http://hdl.handle.net/11104/0294721</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.geomorph.2018.12.010" target="_blank" >10.1016/j.geomorph.2018.12.010</a>

Result language

angličtina

Original language name

Migration of risk elements within the floodplain of the Litavka River, the Czech Republic

Original language description

Floodplains are one of the most complex sedimentary environments used for the reconstruction of human impacts on fluvial deposition and catchment pollution. Studies of polluted floodplains require an interdisciplinary approach, including tools from geomorphology, geophysics, and geochemistry. The spatial distribution of pollutants can reflect not only pollution history but also post-depositional transfers of pollutants. The Litavka River (SW Czech Republic) was impacted by historical mining and processing of Ag-Pb-Zn-Sb sulfidic ores, which resulted in a severely polluted floodplain. Previous studies revealed that nearly all of the floodplain deposits of the Litavka River downstream from the ore district are polluted, indicating massive floodplain aggradation. Our aim was to decipher the role of aggradation in floodplain development by investigating the pollutant distribution in the floodplain fill. Another important goal was to distinguish polluted (modern) sediments from secondarily polluted sediments (which were previously pristine) caused by extensive lateral and vertical post-depositional chemical migration of risk elements within the floodplain fill. The floodplain topography was characterized via a digital terrain model (DTM), the internal structure of the floodplain was determined by electrical resistivity tomography (ERT). Sediment samples were collected from hand-drilled cores across the floodplain along the ERT line, and their elemental composition and magnetic susceptibility were analysed. Dating of sediments was performed via optically stimulated luminescence (OSL). The concentrations of Zn, Pb and Cd, along with values of magnetic susceptibility decreased with increasing distance from the current river channel. However, the spatial patterns of risk elements were more complicated than expected in a fluvial sedimentary environment. Inter-element relationships of risk elements exhibited a complex pattern, with abundant outliers that required the use of robust regression. The results helped distinguish the geochemical difference between proximal and distal floodplains, and to identify zones of anomalous inter-element ratios attributed to post-depositional element migration. The observed migration was significant, and not only vertical but horizontal, spanning a distance of approximately half the floodplain width. Metal migration explains why unpolluted sediments are practically missing from the floodplain fill of the Litavka River. Use of pollution chemostratigraphy, without considering the possibility of post-depositional migration of risk elements, could lead to overestimation of the volume of younger sediments deposited directly within the floodplain and to overestimation of the role of aggradation processes.

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

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

<a href="/en/project/GA15-00340S" target="_blank" >GA15-00340S: Anthropogenic Pollution and Fluvial Architecture: Two Phenomena and a Single Story</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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

Name of the periodical

Geomorphology

ISSN

0169-555X

e-ISSN

—

Volume of the periodical

329

Issue of the periodical within the volume

MAR

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

46-57

UT code for WoS article

000460085400004

EID of the result in the Scopus database

2-s2.0-85059623726