Coarse Bed Sediments in a Headwater Channel as Indicators of Fluvial Processes and Slope-Channel Coupling: A Case Study from the Carpathian Mountains (Czech Republic)

Abstract

Abstract

Do the coarsest bed fractions and stream power record contemporary trends in steep headwater channels?

“…Two studied streams (Lubina and Lichnovský) showed to a certain extent the local adjustment of the coarsest bed fraction to these lateral sediment inputs. In the case of the Malý Škaredý Stream, thick debris flow deposits represent the dominant sediment source resulting in significantly coarser bed material (Galia and Škarpich, 2013;Galia et al, 2015). However, no recent debris flows have been observed in the studied reach of Malý Škaredý since the construction of the road crossing the stream in the 1980s.…”

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

“…In spite of this fact, very low critical condition values were obtained for bedload transport of certain grain-size fractions in local headwater channels (Galia et al, 2015). In addition, the local streams are prone to accelerated erosional processes when low sediment volumes are available for fluvial transport (Galia and Škarpich, 2013;Škarpich et al, 2013).…”

Active point bar development and river bank erosion in the incising channel of the lower Tisza river, Hungary

“…Likewise, point-bars have been the subject of various research (Dietrich and Smith, 1983;Hodskinson and Ferguson, 1998;Pyrce and Ashmore, 2005;Ikeda, 2013;Kasvi et al, 2013;Eke et al, 2014;Ghinassi et al, 2016;Wu et al, 2016;Cosma et al, 2019). The complex interplay of low-frequency high flows, and the quality and quantity of sediments, as well the geometry of rivers are significant in the deposition and erosion of a pointbar, just as in many other fluvial processes (Galia and Škarpich, 2013;Hagstrom et al, 2018;Moody, 2019). The location of a pointbar within the river system (upstream or downstream) also plays an important role in its development (Ghinassi et al, 2016).The important interplay of the processes involved in bank erosion and point-bars leads to the growth of meanders in rivers.…”