Morfologické a sedimentologické účinky říčního dřeva v korytě Černé Opavy
| Title in English | Morphological and Sedimentological Effects of Woody Debris in the Channel of the Černá Opava |
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| Authors | |
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Geologické výzkumy na Moravě a ve Slezsku |
| MU Faculty or unit | |
| Citation | |
| Field | Earth magnetism, geography |
| Keywords | woody debris; channel morphology; grain size; sediment sorting; the Černá Opava River |
| Description | Woody debris in streams and rivers is an important controlling variable of channel morphology. We investigated morphological and sedimentological effects of individual wood pieces and wood accumulations in two segments of the Černá Opava River. We conclude that live and dead woody vegetation conditioned the origin of river branching after the extreme flood in 1997. Afterwards, woody debris governed the spatial distribution of small erosional bed forms (pools) and also partly enhanced the retention of finer sediments. Woody debris has also local impact on sediment grain size and to a lesser extent on sediment sorting. Bed load samples from fluvial forms which were generated by woody debris show finer and better sorted sediments. However, the difference to samples unaffected by woody debris is statistically insignificant. Nevertheless, it is evident that the presence of woody debris steepness the horizontal gradients in sediment grain size. |
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