Sediment accumulation rates and high-resolution stratigraphy of
recent fluvial suspension deposits in various fluvial settings,
Morava River catchment area, Czech Republic

J 2016

Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic

SEDLACEK, Jan, Ondřej BÁBEK a Ondřej KIELAR

Základní údaje

Originální název

Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic

Autoři

SEDLACEK, Jan (203 Česká republika), Ondřej BÁBEK (203 Česká republika, domácí) a Ondřej KIELAR (203 Česká republika, domácí)

Vydání

Geomorphology, AMSTERDAM, ELSEVIER SCIENCE BV, 2016, 0169-555X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 2.958

Kód RIV

RIV/00216224:14310/16:00094237

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1016/j.geomorph.2015.11.011

UT WoS

000369561000006

Klíčová slova anglicky

Reservoirs; Oxbow lakes; Floodplain; Cs-137 dating; Sediment accumulation rates; Trap efficiency

Štítky

AKR, rivok

Změněno: 11. 5. 2017 18:22, Ing. Andrea Mikešková

Anotace

V originále

We present a comprehensive study concerning sedimentary processes in fluvial sediment traps within the Morava River catchment area (Czech Republic) involving three dammed reservoirs, four meanders and oxbow lakes, and several natural floodplain sites. The objective of the study was to determine sediment accumulation rates (SAR), estimate erosion rates, calculating these using a combination of the Cs-137 method and historical data. Another purpose of this study was to provide insight into changing erosion and accumulation rates over the last century. Extensive water course modifications were carried out in the Morava River catchment area during the twentieth century, which likely affected sedimentation rates along the river course. Other multiproxy stratigraphic methods (X-ray densitometry, magnetic susceptibility, and visible-light reflectance spectrometry) were applied to obtain additional information about sediment infill. Sediment stratigraphy revealed distinct distal-to-proximal patterns, especially in reservoirs. Granulometrically, silts and sandy silts prevailed in sediments. Oxbow lakes and meanders contained larger amounts of clay and organic matter, which is the main difference between them and reservoirs. Pronounced Cs-137 peaks were recorded in all studied cores (maximum 377 Bq.kg(-1)), thus indicating Chemobyl fallout from 1986 or older events. Calculated sediment accumulation rates were lowest in distal parts of reservoirs (0.13-0.58 cm/y) and floodplains (0.45-0.88 cm/y), moderately high rates were found in proximal parts of reservoirs and oxbow lakes (2.27-4.4 cm/y), and the highest rates in some oxbow lakes located near the river (6-8 cm/y). The frequency of the inundation still can be high in some natural areas as in the Litovelske Pomoravi protected area, whereas the decreasing frequency of the inundation in other modified parts can contribute to a lower sedimentation rate. The local effects such as difference between SARs in oxbow lakes and reservoirs, different grain size distribution in both systems, and high variability in thickness of their proximal and distal parts play a crucial role in the analysis of regional accumulation rates. Local effects are much stronger than regional effects, such as rainfall and land use. Combined with the low resolution of time scales (usually only three datums are available: reservoir construction datum, 137Cs fallout event, and top of sediment), these effects may obscure the general trends of regionally increasing or decreasing net SARs, making the analysis of erosion rates from the sedimentary record an extremely difficult task. (C) 2015 Elsevier B.V. All rights reserved.

Návaznosti

GAP210/12/0573, projekt VaV

Název: Pozdně kvartérní seismogenní zlomová aktivita a související vývoj sedimentačních pánví ve východní části Českého masívu

Investor: Grantová agentura ČR, Pozdně kvartérní seismogenní zlomová aktivita a související vývoj desimentačních pánví ve východní části Českého masívu

Citovat

SEDLACEK, Jan, Ondřej BÁBEK a Ondřej KIELAR. Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic. Geomorphology. AMSTERDAM: ELSEVIER SCIENCE BV, 2016, roč. 254, February, s. 73-87. ISSN 0169-555X. Dostupné z: https://dx.doi.org/10.1016/j.geomorph.2015.11.011.

@article{1380299,
   author = {Sedlacek, Jan and Bábek, Ondřej and Kielar, Ondřej},
   article_location = {AMSTERDAM},
   article_number = {February},
   doi = {http://dx.doi.org/10.1016/j.geomorph.2015.11.011},
   keywords = {Reservoirs; Oxbow lakes; Floodplain; Cs-137 dating; Sediment accumulation rates; Trap efficiency},
   language = {eng},
   issn = {0169-555X},
   journal = {Geomorphology},
   title = {Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic},
   volume = {254},
   year = {2016}
}

TY  - JOUR
ID  - 1380299
AU  - Sedlacek, Jan - Bábek, Ondřej - Kielar, Ondřej
PY  - 2016
TI  - Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic
JF  - Geomorphology
VL  - 254
IS  - February
SP  - 73-87
EP  - 73-87
PB  - ELSEVIER SCIENCE BV
SN  - 0169555X
KW  - Reservoirs
KW  - Oxbow lakes
KW  - Floodplain
KW  - Cs-137 dating
KW  - Sediment accumulation rates
KW  - Trap efficiency
N2  - We present a comprehensive study concerning sedimentary processes in fluvial sediment traps within the Morava River catchment area (Czech Republic) involving three dammed reservoirs, four meanders and oxbow lakes, and several natural floodplain sites. The objective of the study was to determine sediment accumulation rates (SAR), estimate erosion rates, calculating these using a combination of the Cs-137 method and historical data. Another purpose of this study was to provide insight into changing erosion and accumulation rates over the last century. Extensive water course modifications were carried out in the Morava River catchment area during the twentieth century, which likely affected sedimentation rates along the river course. Other multiproxy stratigraphic methods (X-ray densitometry, magnetic susceptibility, and visible-light reflectance spectrometry) were applied to obtain additional information about sediment infill. Sediment stratigraphy revealed distinct distal-to-proximal patterns, especially in reservoirs. Granulometrically, silts and sandy silts prevailed in sediments. Oxbow lakes and meanders contained larger amounts of clay and organic matter, which is the main difference between them and reservoirs. Pronounced Cs-137 peaks were recorded in all studied cores (maximum 377 Bq.kg(-1)), thus indicating Chemobyl fallout from 1986 or older events. Calculated sediment accumulation rates were lowest in distal parts of reservoirs (0.13-0.58 cm/y) and floodplains (0.45-0.88 cm/y), moderately high rates were found in proximal parts of reservoirs and oxbow lakes (2.27-4.4 cm/y), and the highest rates in some oxbow lakes located near the river (6-8 cm/y). The frequency of the inundation still can be high in some natural areas as in the Litovelske Pomoravi protected area, whereas the decreasing frequency of the inundation in other modified parts can contribute to a lower sedimentation rate. The local effects such as difference between SARs in oxbow lakes and reservoirs, different grain size distribution in both systems, and high variability in thickness of their proximal and distal parts play a crucial role in the analysis of regional accumulation rates. Local effects are much stronger than regional effects, such as rainfall and land use. Combined with the low resolution of time scales (usually only three datums are available: reservoir construction datum, 137Cs fallout event, and top of sediment), these effects may obscure the general trends of regionally increasing or decreasing net SARs, making the analysis of erosion rates from the sedimentary record an extremely difficult task. (C) 2015 Elsevier B.V. All rights reserved.
ER  -

SEDLACEK, Jan, Ondřej BÁBEK a Ondřej KIELAR. Sediment accumulation rates and high-resolution stratigraphy of recent fluvial suspension deposits in various fluvial settings, Morava River catchment area, Czech Republic. \textit{Geomorphology}. AMSTERDAM: ELSEVIER SCIENCE BV, 2016, roč.~254, February, s.~73-87. ISSN~0169-555X. Dostupné z: https://dx.doi.org/10.1016/j.geomorph.2015.11.011.

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