1. bookVolume 24 (2016): Issue 3 (September 2016)
Journal Details
License
Format
Journal
eISSN
2199-6202
First Published
30 Jul 2013
Publication timeframe
4 times per year
Languages
English
access type Open Access

Biogeomorphological effects of leaf accumulations in stepped-bed channels: Exploratory study, Moravskoslezské Beskydy Mountains, Czech Republic

Published Online: 08 Oct 2016
Volume & Issue: Volume 24 (2016) - Issue 3 (September 2016)
Page range: 13 - 23
Received: 28 Apr 2015
Accepted: 05 Feb 2016
Journal Details
License
Format
Journal
eISSN
2199-6202
First Published
30 Jul 2013
Publication timeframe
4 times per year
Languages
English
Abstract

The stepped-bed system, with a step-like longitudinal profile, is typical morphology in steep headwater streams. These systems are created by a series of coarse sediments or instream wood (steps with supercritical flows) interspaced with finer material (forming pools with subcritical flows). In the case of well-developed steps and pools, the resulting channel-reach morphology is referred to as “step-pool” morphology. In this study, we identify a previously undescribed type of step-pool formation, the “foliaged step-pool”, in the high-gradient Stoligy Stream of the Moravskoslezské Beskydy Mountains. The defining feature of this formation is the significant presence of leaves in the step structure. The geometry of the steps and pools was measured and the parameters that characterise the distribution, amount and function of leaves acting in these areas were defined. Statistical results showed differences between non-foliaged and foliaged step-pool formations, in which the latter showed a significant increase in storage level, influencing the channel’s hydrodynamics. Particle-size analyses demonstrated that foliaged step-pool formations had finer sediment in the pools, which indicates that there are differences in sediment transport processes between foliaged and non-foliaged formations. These results offer new insights into stepped-bed and step-pool morphology, providing directions for further research on small streams in deciduous forested regions.

Keywords

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