Publication details
SEDIMENT FLUX CONDITIONS IN THE ČERNÁ OPAVA RIVER BASIN - AN ANALYSIS OF THE (DIS)CONECTIVITY OF THE FLUVIAL SYSTEM
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| Year of publication | 2016 |
| Type | Conference abstract |
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| Citation | |
| Description | This contribution concerns with sediment flux conditions and its disruptions in the Černá Opava River basin. Furthermore, attention is paid to the analysis of the (dis)connectivity of the fluvial system and the delivery of sediments into the streams and downstream fining of the bedload sediment. The Černá Opava River Basin represents one of the examples of connective middle-mountain river basins in the Czech Republic. Almost 60 % of the valley network is connective (Brierley 2006), which means very close contact between slopes and channels (slope-channel coupling phenomenon; Wistuba 2014). The author also focuses on defining the potential source areas of sediment-delivery, which were checked by the field survey. Studied river basin is strongly connected in terms of sediment delivery into the channels, however there is not show hungry water effect, despite of the numerous natural and anthropogenic barriers in channels. One of the goal is to identify the areas of erosion and sediment accumulation for the selected streams. The attention is also paid to defining blockages in the sediment transport in the form of buffers, barriers and blankets. Although Černá Opava River basin is located in the Protected Landscape Area Jeseníky (PLA Jeseníky), sediment transport is disrupted due to the human impact in the channel and close river landscape. There are two main types - historical remains (flumes to the saw mills or iron mills) in the upper reaches. Recent channel regulations in the urban area of Vrbno city (flood control measures after flood in 1997, straightening the river, concreted parts of the channel). Part of the thesis deals with anthropogenic interventions in the channel and extracting of sediments. During the field mapping, sediment grain size analysis was carried out at selected locations and it is assessed whether a refinement of the bottom material is present. Generally bed load sediment downstream fining was observed and clarified with an attention on local disturbances in this trend. Further maps, source areas of sediment delivery, blockages are created accompanied with illustrative documentation photographs. This contribution provides a summary view about existing findings on this river basin research since 2012. |