Modern sedimentary bodies in realigned channel of the river Morava (Czech Republic): The fate of ...
FAMĚRA, Martin, Ondřej BÁBEK, Slavomír NEHYBA and Klára HILSCHEROVÁ. Modern sedimentary bodies in realigned channel of the river Morava (Czech Republic): The fate of toxic contaminants. In 25th IAS Meeting of Sedimentology 2007, Patras - Greece, Book of Abstracts. 2007. |
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Original name | Modern sedimentary bodies in realigned channel of the river Morava (Czech Republic): The fate of toxic contaminants |
Name in Czech | Recentní sedimentární tělesa v regulovaném korytě řeky Moravy (Česká republika): osud toxických kontaminantů |
Authors | FAMĚRA, Martin (203 Czech Republic, guarantor, belonging to the institution), Ondřej BÁBEK (203 Czech Republic, belonging to the institution), Slavomír NEHYBA (203 Czech Republic, belonging to the institution) and Klára HILSCHEROVÁ (203 Czech Republic, belonging to the institution). |
Edition | 25th IAS Meeting of Sedimentology 2007, Patras - Greece, Book of Abstracts, 2007. |
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Original language | English |
Type of outcome | Conference abstract |
Field of Study | 10500 1.5. Earth and related environmental sciences |
Country of publisher | Greece |
Confidentiality degree | is not subject to a state or trade secret |
RIV identification code | RIV/00216224:14310/07:00022558 |
Organization unit | Faculty of Science |
Keywords in English | accretion deposits; bars; stram velocity; bathymetry; sonar; heavy metals; organic pollutants |
Tags | accretion deposits, bars, bathymetry, heavy metals, organic pollutants, sonar, stram velocity |
Tags | International impact, Reviewed |
Changed by | Changed by: prof. RNDr. Luděk Bláha, Ph.D., učo 15473. Changed: 29/4/2011 12:54. |
Abstract |
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The water course of the River Morava was realigned in the 1st half of the 20th century. Since then, the water course started to build new sedimentary bodies, depositing suspended-load and bed-load sediments from highly industrialized watersheds. The deposits contain toxic heavy metals and organic compounds bound to fine-grained solid particles. Much of this contamination is likely to be redistributed, constituting potential serious environmental hazards. A new project has been currently launched to unravel the depositional/erosional history of the modern sediment bodies and the fate of toxic compounds along the water course. Several air-borne-photography map sheets, supported by bathymetry data obtained from StreamPro river surveying and sonar measurements indicate the presence of longitudinal bars and point bars up to 260m long, 25-m wide 2.5m high. Stream-velocity measurements during low water yielded mean vertical velocities of 0.05 to 0.3 m.s-1 above the bars, and 0.1 to 0.7 m.s-1 above thalweg. The sampled bar sediments consist of light-coloured, sometimes parallel-laminated silts and sandy silts (silt fraction: 56.3 to 66.5%; sand: 20.6 to 33.9%; clay: 8.2 to 12.4%) and silty sands (sand: 55.1; silt: 37.6%, clay: 6.8%) alternating with dark silty layers enriched in organic matter. The sand fraction consists mainly of plant remains, quartz, sandstone clasts and anthropogenic materials. Above the main tributary from the highly-industrialized Zlín area, sediments of the bars contain only moderate toxic contamination (Pb: 23.9 to 24.3; Cu: 35.7 to 36.7; Cr: 38.1 to 40.4; Zn: 148.3 to 155.3 microgram.g-1; Suma PAH: 18.7 to 19.0 microgram.g-1; Suma PCB: 12.6 to 21.9 ng.g-1). Below the tributary, a significant input of toxic contamination was detected (Pb: 47.1; Cu: 66.1; Cr: 239.2; Zn: 303.7 microgram.g-1; Suma PAH: 46.3 microgram.g-1; Suma PCB: 57.3 ng.g-1), but the concentrations decrease to values comparable to- or even lower than those above the tributary, over the distance of 23.1 km along the water course. This decrease is considered to occur due to storage of the contaminants in the sediment bodies. |
Abstract (in Czech) |
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The water course of the River Morava was realigned in the 1st half of the 20th century. Since then, the water course started to build new sedimentary bodies, depositing suspended-load and bed-load sediments from highly industrialized watersheds. The deposits contain toxic heavy metals and organic compounds bound to fine-grained solid particles. Much of this contamination is likely to be redistributed, constituting potential serious environmental hazards. A new project has been currently launched to unravel the depositional/erosional history of the modern sediment bodies and the fate of toxic compounds along the water course. Several air-borne-photography map sheets, supported by bathymetry data obtained from StreamPro river surveying and sonar measurements indicate the presence of longitudinal bars and point bars up to 260m long, 25-m wide 2.5m high. Stream-velocity measurements during low water yielded mean vertical velocities of 0.05 to 0.3 m.s-1 above the bars, and 0.1 to 0.7 m.s-1 above thalweg. The sampled bar sediments consist of light-coloured, sometimes parallel-laminated silts and sandy silts (silt fraction: 56.3 to 66.5%; sand: 20.6 to 33.9%; clay: 8.2 to 12.4%) and silty sands (sand: 55.1; silt: 37.6%, clay: 6.8%) alternating with dark silty layers enriched in organic matter. The sand fraction consists mainly of plant remains, quartz, sandstone clasts and anthropogenic materials. Above the main tributary from the highly-industrialized Zlín area, sediments of the bars contain only moderate toxic contamination (Pb: 23.9 to 24.3; Cu: 35.7 to 36.7; Cr: 38.1 to 40.4; Zn: 148.3 to 155.3 microgram.g-1; Suma PAH: 18.7 to 19.0 microgram.g-1; Suma PCB: 12.6 to 21.9 ng.g-1). Below the tributary, a significant input of toxic contamination was detected (Pb: 47.1; Cu: 66.1; Cr: 239.2; Zn: 303.7 microgram.g-1; Suma PAH: 46.3 microgram.g-1; Suma PCB: 57.3 ng.g-1), but the concentrations decrease to values comparable to- or even lower than those above the tributary, over the distance of 23.1 km along the water course. This decrease is considered to occur due to storage of the contaminants in the sediment bodies. |
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MSM0021622412, plan (intention) | Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL) |
Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL) |
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