Prostorová distribuce a vlastnosti dřevních akumulací jako indikátory transportu a depozice hrubého říčního dřeva - případová studie z řeky Dyje na česko-rakouském pomezí
| Title in English | Spatial distribution and properties of wood jams as indicators of large woody debris transport and depostion - an example from the River Dyje at the Czech-Austrian border |
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| Authors | |
| Year of publication | 2011 |
| Type | Article in Periodical |
| Magazine / Source | Thayensia |
| MU Faculty or unit | |
| Citation | |
| Field | Earth magnetism, geography |
| Keywords | wood jams; LWD transport; LWD deposition; valley bottom geomorphology; the Dyje River |
| Description | Abundance, spatial distribution and characteristics of wood jams were examined in 62 segments of the river corridor along a 42 km section of the River Dyje. The initial assumption that the spatial distribution and abundance of wood jams would be affected by the meandering valley geomorphology was not confirmed. A statistically significant but weak relationship was found only between the volume of wood jams and width of the riparian zone. Relationships to position within meander bend, channel width and slope, meander radius and downstream distance were not found. Spatial distribution and abundance of wood jams appear rather to reflect the distribution of forest and meadows in the valley bottom. Most of the jams were formed during floods in 2002 and 2006; 65 % of the wood jams are allochthonous, while 29 % of them are combined. Large woody debris transport and wood jam formation were facilitated by the fact that the river manager cut vast quantities of fallen trees into short logs after the flood in 2002. Large woody debris transport during flood events was also highly influenced by their dimensions (length and diameter) and their decay status. Obstructions within the corridor, including in particular the standing and fallen trees and boulders, encouraged the formation of wood jams. |
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