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Dr. Tomáš Galia
Department of Physical Geography and Geoecology, Faculty of Science, University of Ostrava, 710 00 Ostrava, Chittussiho 10 street, Czech Republic

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Research Keywords & Expertise

0 Morphology and sediment transport in mountain streams
0 Instream wood
0 Grade-control structures
0 Modelling of bedload transport
0 River restorations

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Instream wood
Grade-control structures
Modelling of bedload transport

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Journal article
Published: 12 June 2021 in Geosciences
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Mountain headwater streams are still somewhat on the boundary of interest regarding possible human impact on their morphology or geomorphic processes, which may be caused by our perception of mountains as islands of relatively preserved natural conditions. This paper summarizes the past and present human pressure on the headwater streams that drain the highest mountain ranges of the Outer Western Carpathians in Czechia. Anthropogenic pressure began in this region in the 16th century during a colonization of the mountains and continued by timber harvesting, timber floating, and construction of torrent control works until present. Each of these interventions produced a morphological response of the channels in relation to altered sediment or water fluxes at the whole catchment scale or within longitudinal stream profiles. Because it is highly unlikely to reach pre-settlement conditions of the channels, the management effort should be concentrated to achieve realistic restoration targets under the present socioeconomic circumstances by taking into consideration the morphodynamical specifics of mountain headwater streams.

ACS Style

Tomáš Galia. Legacy of Human Impact on Geomorphic Processes in Mountain Headwater Streams in the Perspective of European Cultural Landscapes. Geosciences 2021, 11, 253 .

AMA Style

Tomáš Galia. Legacy of Human Impact on Geomorphic Processes in Mountain Headwater Streams in the Perspective of European Cultural Landscapes. Geosciences. 2021; 11 (6):253.

Chicago/Turabian Style

Tomáš Galia. 2021. "Legacy of Human Impact on Geomorphic Processes in Mountain Headwater Streams in the Perspective of European Cultural Landscapes." Geosciences 11, no. 6: 253.

Original article
Published: 12 April 2021 in Journal of Mountain Science
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Tributaries are one of the most important factors contributing to variability in the downstream evolution of bed sediment grain size. The primary aim of this work is to evaluate the response of the bed sediment texture in the recipient channel induced by ten tributaries of the Černá Ostravice stream and find reach-scale and catchment-scale parameters that would be able to predict this response. The research was based on collecting information on the grain size distributions at sites adjacent to confluence zones. A significant change in sediment texture occurred in the vicinity of five confluences. Considering the other factors contributing to grain size variability (e.g., local channel geometry, lithology, and lateral sediment sources), it was assumed that only four of them were associated with a sufficient bedload influx to alter the sediment calibre below the junction. Moreover, a significant morphological effect in the form of a large confluence bar was observed in one case. These tributaries had several common features: (i) they had a larger relative catchment area than that of nonsignificant tributaries; (ii) they were characterized by different bed grain sizes, with some exceptions; and (iii) they had a higher unit stream power close to the confluence in relation to that of the mainstream. These characteristics were represented by the proposed relative parameters, including the relative unit stream power and bed material texture, which allowed the best classification of significant and nonsignificant tributaries. In their simplified form, the parameters described the transport capacity and grain size distribution, which were generally considered to be primary factors responsible for a redefinition of the sediment texture in the recipient channel. However, it should be noted that these results are subject to some degree of uncertainty due to the relatively small sample size of only 10 tributaries.

ACS Style

Ivan Smažák; Tomáš Galia. Influence of tributaries on downstream bed sediment grain sizes under flysch conditions. Journal of Mountain Science 2021, 18, 847 -862.

AMA Style

Ivan Smažák, Tomáš Galia. Influence of tributaries on downstream bed sediment grain sizes under flysch conditions. Journal of Mountain Science. 2021; 18 (4):847-862.

Chicago/Turabian Style

Ivan Smažák; Tomáš Galia. 2021. "Influence of tributaries on downstream bed sediment grain sizes under flysch conditions." Journal of Mountain Science 18, no. 4: 847-862.

Journal article
Published: 17 March 2021 in CATENA
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Large wood (LW) is an important component of headwater streams that drain forested mountain regions, and a variety of disturbances act as LW recruitment and transport agents, dictating the final distribution of LW in this part of the fluvial system. We focused on the patterns of LW recruitment and distribution in three small mid-mountain catchments in relation to their disturbance histories. In addition to a detailed LW inventory used to assess the distributional patterns, dendroecological dating was used to obtain the ages of tree death and the growth increments of the trees during the last 30 years of their lives. The studied reach that was impacted only by blowdowns indicated the highest LW volume (193 m3/ha), and the calculated concavity pointed to a uniform longitudinal distribution of LW. The studied reach that was treated by a high-magnitude cascade recruitment-transport process (blowdown and debris flow) had the lowest LW volume (82.2 m3/ha) and a highly irregular longitudinal LW distribution; a quite similar irregularity was also obtained for the control reach, in which neither high-magnitude recruitment nor transport disturbances had occurred. Dendroecological dating revealed that 52.1% of sampled LW died during the period of 2005–2011, including deaths due to a blowdown in September 2007 and a debris flow in July 2011. This is particularly evident in the reach impacted by both disturbances; in this reach, all sampled logs died during this period. Overall, the analysis of LW growth patterns pointed to harsh conditions in 56.3% of the sampled LW, reflected by the presence of growth disturbances and abrupt or gradual declines prior to death. In contrast, a slight predominance of LW with balanced or improved growth increments (53.9%) was identified in the reach impacted by both blowdown and debris flow, indicating a higher proportion of trees that would normally stay alive.

ACS Style

Tomáš Galia; Radek Tichavský; Andrea Fabiánová; Vilém Spálovský. Effects of multiple disturbances on large wood recruitment and distribution in mid-mountain headwater streams. CATENA 2021, 202, 105279 .

AMA Style

Tomáš Galia, Radek Tichavský, Andrea Fabiánová, Vilém Spálovský. Effects of multiple disturbances on large wood recruitment and distribution in mid-mountain headwater streams. CATENA. 2021; 202 ():105279.

Chicago/Turabian Style

Tomáš Galia; Radek Tichavský; Andrea Fabiánová; Vilém Spálovský. 2021. "Effects of multiple disturbances on large wood recruitment and distribution in mid-mountain headwater streams." CATENA 202, no. : 105279.

Journal article
Published: 06 January 2021 in Geomorphology
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Check dams are frequently built in mountain streams as sequences of stair-like grade-control structures to stabilise longitudinal profiles and decrease bedload transport rates. However, their effect on sediment connectivity is still not properly understood owing to missing field data about particle mobility through check-dam sequences. In this study, we tracked tagged particles in a reach intensively managed by torrent control works (i.e., a straightened channel stabilised by a sequence of consolidation check dams and bank reinforcements) and in an untreated pool-riffle reach with similar catchment-scale characteristics. Data on water level and particle mobility were collected over two years and five resurveys. In addition, we measured the grain-size characteristics of armour and subarmour bed layers to assess potential armouring processes in relation to the presence of the check dams. The tracking of tagged particles showed clear differences in the longitudinal and channel-unit patterns of particle retention between the studied reaches after two bankfull events. The presence of the torrent control works accelerated the downstream transport of the tagged particles despite lower calculated unit stream powers in comparison with those in the unmanaged reach. We observed a close-to-normal longitudinal distribution of the tagged particles and longer travel distances in the managed reach. In contrast, the pool-riffle reach indicated high retention of recovered particles in fresh bar deposits and a left-skewed distribution of the final travel distances. In addition, the managed reach with check dams indicated strong bed armouring processes that likely made the vertical exchange of particles between sedimentary layers difficult. In contrast to the general perception of check dams as decelerators of downstream sediment fluxes, our field experiment demonstrated a specific case when sequences of consolidation check dams in small and relatively low-gradient managed channels can act as boosters of longitudinal sediment connectivity.

ACS Style

Tomáš Galia; Václav Škarpich; Stanislav Ruman. Impact of check dam series on coarse sediment connectivity. Geomorphology 2021, 377, 107595 .

AMA Style

Tomáš Galia, Václav Škarpich, Stanislav Ruman. Impact of check dam series on coarse sediment connectivity. Geomorphology. 2021; 377 ():107595.

Chicago/Turabian Style

Tomáš Galia; Václav Škarpich; Stanislav Ruman. 2021. "Impact of check dam series on coarse sediment connectivity." Geomorphology 377, no. : 107595.

Journal article
Published: 30 October 2020 in AUC GEOGRAPHICA
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ACS Style

Adriana Holušová; Tomáš Galia. Downstream fining trends of gravel bar sediments: a case study of Czech Carpathian rivers. AUC GEOGRAPHICA 2020, 55, 229 -242.

AMA Style

Adriana Holušová, Tomáš Galia. Downstream fining trends of gravel bar sediments: a case study of Czech Carpathian rivers. AUC GEOGRAPHICA. 2020; 55 (2):229-242.

Chicago/Turabian Style

Adriana Holušová; Tomáš Galia. 2020. "Downstream fining trends of gravel bar sediments: a case study of Czech Carpathian rivers." AUC GEOGRAPHICA 55, no. 2: 229-242.

Research article
Published: 04 April 2020 in Earth Surface Processes and Landforms
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Although in‐channel and floodplain large wood (LW) has been recognized as an important component of lotic ecosystems, there is still limited knowledge on the recruitment, mobility and retention of LW in rivers with an intermittent hydrological regime. In this study, we analysed the LW characteristics and related reach‐scale variables of 22 reaches in a Mediterranean intermittent river (Evrotas, Greece) in order to identify predictors of in‐channel and floodplain LW distribution. Our results indicated high downstream variation in LW volumes in the fluvial corridor (0.05‐25.51 m3/ha for in‐channel LW and 0‐30.88 m3/ha for floodplain LW). In‐channel and floodplain LW retention was primarily driven by the hydrological regime of the studied reaches (i.e., perennial or non‐perennial) with higher volumes of LW observed in perennial sections. The width of the riparian corridor was an important predictor of LW storage at the reach scale. Non‐perennial reaches had a disproportionally larger number of relatively small‐diameter living trees at the expense of mature trees with larger diameters typical for riparian stands functioning as LW recruitment areas in perennial reaches. The smaller dimensions of in‐channel LW in non‐perennial reaches, coupled with the dominance of loose LW pieces, implies frequent LW transport during ordinary flood events. Nevertheless, overall low LW retention in the fluvial corridor under non‐perennial flow regime predicts low volumes of mobilized LW. In contrast, the recruitment of relatively long and large‐diameter LW from mature riparian stands in perennial reaches, together with additional LW stabilisation by banks, bed sediments, living trees or other LW pieces decreases the potential for further LW transport.

ACS Style

Tomáš Galia; Tereza Macurová; Leonidas Vardakas; Václav Škarpich; Tereza Matušková; Eleni Kalogianni. Drivers of variability in large wood loads along the fluvial continuum of a Mediterranean intermittent river. Earth Surface Processes and Landforms 2020, 45, 2048 -2062.

AMA Style

Tomáš Galia, Tereza Macurová, Leonidas Vardakas, Václav Škarpich, Tereza Matušková, Eleni Kalogianni. Drivers of variability in large wood loads along the fluvial continuum of a Mediterranean intermittent river. Earth Surface Processes and Landforms. 2020; 45 (9):2048-2062.

Chicago/Turabian Style

Tomáš Galia; Tereza Macurová; Leonidas Vardakas; Václav Škarpich; Tereza Matušková; Eleni Kalogianni. 2020. "Drivers of variability in large wood loads along the fluvial continuum of a Mediterranean intermittent river." Earth Surface Processes and Landforms 45, no. 9: 2048-2062.

Journal article
Published: 17 March 2020 in Ecological Engineering
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ACS Style

Václav Škarpich; Tereza Macurová; Tomáš Galia; Stanislav Ruman; Jan Hradecký. Degradation of multi-thread gravel-bed rivers in medium-high mountain settings: Quantitave analysis and possible solutions. Ecological Engineering 2020, 148, 1 .

AMA Style

Václav Škarpich, Tereza Macurová, Tomáš Galia, Stanislav Ruman, Jan Hradecký. Degradation of multi-thread gravel-bed rivers in medium-high mountain settings: Quantitave analysis and possible solutions. Ecological Engineering. 2020; 148 ():1.

Chicago/Turabian Style

Václav Škarpich; Tereza Macurová; Tomáš Galia; Stanislav Ruman; Jan Hradecký. 2020. "Degradation of multi-thread gravel-bed rivers in medium-high mountain settings: Quantitave analysis and possible solutions." Ecological Engineering 148, no. : 1.

Journal article
Published: 15 February 2020 in Geomorphology
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In deeply incised rivers, bankfull discharge (i.e. the flow filling the channel to the top of the banks) does not represent channel forming flow and increasingly large flows are associated with increasingly large boundary shear stress. In such rivers, solid bank revetments (rip-rap, gabions, retaining wall) are usually constructed to the top of the banks—similarly as in vertically stable rivers—despite the fact that the upper parts of the banks may never be flooded. To optimize the height of solid bank revetments in deeply incised channels, it is thus important to determine whether a flood magnitude can be identified, for which the combination of flow duration and bedload transport rate results in the highest river efficiency to transport bedload and perform geomorphic work. This question was explored in the Morávka River, Czech Carpathians, which deeply incised into non-resistant flysch bedrock over the past few decades. Observations of high-water marks (e.g. trash lines, wash lines) after a flood in 2014 enabled reconstruction of the peak flood stage in the deeply incised reach and the adjacent, vertically stable reach. These observations, together with post-flood measurements of cross-sectional channel geometry, distances between consecutive cross sections and estimates of channel roughness, were used in one-dimensional hydraulic modelling aimed to determine a peak discharge of the flood in a number of cross sections in both reaches. Despite the close proximity of both reaches, markedly higher discharge values were obtained for the incised reach and the discrepancy was used to calibrate roughness coefficients for the incised reach. A flow-duration curve determined on the basis of a 25-year series of daily discharges in the upstream gauging station together with data about channel geometry and roughness in the incised cross sections were used to simulate bedload transport at successive discharges with the BAGS sediment transport model. The calculations indicated the effective discharge for bedload transport in the incised reach to have the recurrence interval of 7–12 years. The upper limit of the reach-average effective discharge is associated with the stage slightly higher than a half of the bankfull depth. This highlights the disparity between effective and bankfull discharges and indicates that in incised channels, channel forming flow should be linked with the former. The vertical extent of the reach-average effective discharge is proposed as an indicator of the optimal, cost-effective height of solid bank-protection structures in the deeply incised channel and the suitability of this approach is discussed.

ACS Style

Bartłomiej Wyżga; Artur Radecki-Pawlik; Tomáš Galia; Karol Plesiński; Václav Škarpich; Radek Dušek. Use of high-water marks and effective discharge calculation to optimize the height of bank revetments in an incised river channel. Geomorphology 2020, 356, 107098 .

AMA Style

Bartłomiej Wyżga, Artur Radecki-Pawlik, Tomáš Galia, Karol Plesiński, Václav Škarpich, Radek Dušek. Use of high-water marks and effective discharge calculation to optimize the height of bank revetments in an incised river channel. Geomorphology. 2020; 356 ():107098.

Chicago/Turabian Style

Bartłomiej Wyżga; Artur Radecki-Pawlik; Tomáš Galia; Karol Plesiński; Václav Škarpich; Radek Dušek. 2020. "Use of high-water marks and effective discharge calculation to optimize the height of bank revetments in an incised river channel." Geomorphology 356, no. : 107098.

Journal article
Published: 12 January 2020 in Water
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Floods represent frequent hazards in both low- and first-order catchments; however, to date, the investigation of peak flow discharges in the latter catchments has been omitted due to the absence of gauging stations. The quantification of flood parameters in a first-order catchment (1.8 km2) was realised in the moderate relief of NE Czechia, where the last flash flood event in 2014 caused considerable damage to the infrastructure. We used an integrated approach that included the dendrogeomorphic reconstruction of past flood activity, hydraulic modelling of the 2014 flash flood parameters using a two-dimensional IBER model, and evaluation of the channel stability using sedimentological parameters. Based on 115 flood scars, we identified 13 flood events during the period of 1955 to 2018, with the strongest signals recorded in 2014, 2009 and 1977. The modelled peak flow discharge of the last 2014 flood was equal to 4.5 m3·s−1 (RMSE = 0.32 m) using 26 scars as palaeostage indicators. The excess critical unit stream power was observed at only 24.2% of the reaches, representing predominantly bedrock and fine sediments. Despite local damage during the last flood, our results suggest relatively stable geomorphic conditions and gradual development of stream channels under discharges similar to that in 2014.

ACS Style

Radek Tichavský; Stanislav Ruman; Tomáš Galia. Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters. Water 2020, 12, 212 .

AMA Style

Radek Tichavský, Stanislav Ruman, Tomáš Galia. Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters. Water. 2020; 12 (1):212.

Chicago/Turabian Style

Radek Tichavský; Stanislav Ruman; Tomáš Galia. 2020. "Hydrogeomorphic Impacts of Floods in a First-Order Catchment: Integrated Approach Based on Dendrogeomorphic Palaeostage Indicators, 2D Hydraulic Modelling and Sedimentological Parameters." Water 12, no. 1: 212.

Journal article
Published: 11 September 2019 in Water Resources Research
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ACS Style

T. Galia; M. Horáček; T. Macurová; V. Škarpich. Drivers of Low Instream Large Wood Retention and Imprints of Wood Mobility in Mountain Nonperennial Streams of a Mediterranean Semiarid Environment. Water Resources Research 2019, 55, 7843 -7859.

AMA Style

T. Galia, M. Horáček, T. Macurová, V. Škarpich. Drivers of Low Instream Large Wood Retention and Imprints of Wood Mobility in Mountain Nonperennial Streams of a Mediterranean Semiarid Environment. Water Resources Research. 2019; 55 (9):7843-7859.

Chicago/Turabian Style

T. Galia; M. Horáček; T. Macurová; V. Škarpich. 2019. "Drivers of Low Instream Large Wood Retention and Imprints of Wood Mobility in Mountain Nonperennial Streams of a Mediterranean Semiarid Environment." Water Resources Research 55, no. 9: 7843-7859.

Journal article
Published: 24 January 2019 in Science of The Total Environment
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Check dams can modify local channel and sedimentological characteristics through sediment deposition in upstream sedimentary wedges and scour processes downstream of individual check dams. However, research focusing on the channel reaches between subsequent check dams (referred to here as intermediate reaches) is limited. We evaluated channel complexity and its selected dimensions (longitudinal and cross-section heterogeneity, sediment characteristics and the presence of instream wood) in 30-m long intermediate reaches (n = 10) between subsequent check dams in comparison with channel reaches that were not treated with check dams (n = 10) in both a stepped-bed stream in a steep confined valley and an originally pool-riffle stream in an unconfined foothill valley. Check dams altered the channel complexity of intermediate reaches when compared with reaches of undisturbed streams. However, in contrast to foothills streams, check dams did not heavily affect longitudinal or cross-sectional heterogeneity of the intermediate reaches in the steep streams. Despite an increase in sediment homogeneity in steep reaches treated with check dams, the presence of coarse bed sediments helped to preserve their stepped-bed morphology. In contrast, the longitudinal profile of the treated foothill stream completely lost its vertical oscillations because of the transformation of pool-riffles to a uniform plane bed morphology. Similarly, cross-sectional heterogeneity in the foothill stream was degraded in comparison with those of untreated reaches. We did not observe differences in instream wood abundance between treated and untreated streams.

ACS Style

Tomáš Galia; Václav Škarpich; Stanislav Ruman; Tereza Macurová. Check dams decrease the channel complexity of intermediate reaches in the Western Carpathians (Czech Republic). Science of The Total Environment 2019, 662, 881 -894.

AMA Style

Tomáš Galia, Václav Škarpich, Stanislav Ruman, Tereza Macurová. Check dams decrease the channel complexity of intermediate reaches in the Western Carpathians (Czech Republic). Science of The Total Environment. 2019; 662 ():881-894.

Chicago/Turabian Style

Tomáš Galia; Václav Škarpich; Stanislav Ruman; Tereza Macurová. 2019. "Check dams decrease the channel complexity of intermediate reaches in the Western Carpathians (Czech Republic)." Science of The Total Environment 662, no. : 881-894.

Journal article
Published: 17 December 2018 in Geologické výzkumy na Moravě a ve Slezsku
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High-gradient streams are integral parts of the fluvial systems, which connect the mountainous landscapes with lowland rivers in the sense of water and sediment transport. We analysed downstream grain-size characteristics of bed sediments and sphericity of grains with respect to the local flysch lithology and channel geometry in the 5.4 km long reach of the high-gradient Kobylská Stream (the Vsetín highlands, Outer Western Carpathians, Czech Republic). Results showed a high variability of bed-sediment sizes in the longitudinal course of the Kobylská stream. This condition is given by the occurrence of anthropogenic impact in the studied channel (local bank stabilisations, grade-control structures) and lateral sediment input from the adjacent landslides and bank failures. The lithology of the flysch nappe structure of the basin significantly influenced variations of bed sediment grain-sizes. Different bedrock resistance resulted into inverse correlation between the local river gradient and related bed grain-sizes. Especially the mudstone bedrock layers had significant impact on the fining of bed sediment in the upper steep part of the basin (D50 ≤ 40 mm) and by contrast, sandstone bedrock caused the coarsening of the bed sediment in the middle and lower parts (D50 up to 50 mm) characterised by lower bed gradients.

ACS Style

Tereza Macurová; Václav Škarpich; Tomáš Galia. VLIV LITOLOGIE A MORFOLOGIE VYSOKOGRADIENTOVÝCH KORYT NA DNOVÉ SEDIMENTY: PŘÍKLADOVÁ STUDIE VODNÍHO TOKU KOBYLSKÁ (VSETÍNSKÉ VRCHY, ČESKÁ REPUBLIKA). Geologické výzkumy na Moravě a ve Slezsku 2018, 25, 1 .

AMA Style

Tereza Macurová, Václav Škarpich, Tomáš Galia. VLIV LITOLOGIE A MORFOLOGIE VYSOKOGRADIENTOVÝCH KORYT NA DNOVÉ SEDIMENTY: PŘÍKLADOVÁ STUDIE VODNÍHO TOKU KOBYLSKÁ (VSETÍNSKÉ VRCHY, ČESKÁ REPUBLIKA). Geologické výzkumy na Moravě a ve Slezsku. 2018; 25 (1-2):1.

Chicago/Turabian Style

Tereza Macurová; Václav Škarpich; Tomáš Galia. 2018. "VLIV LITOLOGIE A MORFOLOGIE VYSOKOGRADIENTOVÝCH KORYT NA DNOVÉ SEDIMENTY: PŘÍKLADOVÁ STUDIE VODNÍHO TOKU KOBYLSKÁ (VSETÍNSKÉ VRCHY, ČESKÁ REPUBLIKA)." Geologické výzkumy na Moravě a ve Slezsku 25, no. 1-2: 1.

Conference paper
Published: 05 September 2018 in E3S Web of Conferences
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We present a comparative study of large wood (LW) mobility in two steep channels (0.062) and an ephemeral Mediterranean steep stream (the Sfakiano Gorge, Crete, Greece; A≤52 km2). Both studied hydro-geomorphic events were partially accompanied by debris-flood or debris-flow character of sediment transport including significant content of LW. The minimal estimations of transported LW volume were 71.3 m3 along 1.7 km long reach in the Klepáčský and 49.4 m3 along 4 km long reach in the Sfakiano Gorge. Despite completely different characters of hydrologic regimes, riparian zones and valley confinement settings, living trees in the valley floor played crucial role in wood deposition and development of large jams in both environments. The trees living in the valley floor were the main source of LW in the studied Mediterranean channel, whereas long-term LW recruitment from very steep hillslopes or rock cliffs was quite negligible. On the other hand, previous windstorms in the Klepáčsky caused notable delivery of LW from adjacent hillslopes and LW recruitment by bank erosion occurred only at spatially-limited semi-confined parts of the valley.

ACS Style

Tomáš Galia; Václav Škarpich; Radek Tichavský. Large wood recruitment and mobility in steep mountain streams of contrast European landscapes. E3S Web of Conferences 2018, 40, 02001 .

AMA Style

Tomáš Galia, Václav Škarpich, Radek Tichavský. Large wood recruitment and mobility in steep mountain streams of contrast European landscapes. E3S Web of Conferences. 2018; 40 ():02001.

Chicago/Turabian Style

Tomáš Galia; Václav Škarpich; Radek Tichavský. 2018. "Large wood recruitment and mobility in steep mountain streams of contrast European landscapes." E3S Web of Conferences 40, no. : 02001.

Conference paper
Published: 05 September 2018 in E3S Web of Conferences
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In the last centuries, gravel-bed rivers in developed countries have undergone rapid changes in channel morphology. The most serious problems include channel transformation related to progressive channel narrowing, incision or bed sediment coarsening. The main reasons for transformations were connected to the human interventions, which affected water and sediment fluxes in the basins. This paper summarizes contemporary research activities focused on these negative effects of channel transformations in the Czech flysch Carpathian rivers (the Morávka, the Olše and the Ostravice draining the highest mountainous areas of the Beskydy Mts). As the result of channel transformations, progressive changes in fluvial ecosystem were observed. The initial phytosociological survey demonstrates a higher biodiversity in the floodplain along the preserved multi-thread river channel than along the deeply incised channel in the Morávka River basin. Our observations of aquatic communities demonstrated that the channel transformation connected with incision and coarsening of bed sediments negatively affected fish or lamprey populations in the studied rivers. Regulation, damming and incision of channels caused changes of hydrological regime linked with gradual drying of floodplain. Additionally, a large set of hydraulic structures, bridges or weirs were affected by undercutting and progressive destruction in the Ostravice, Olše and Morávka River basins, which is assigned to increased transport capacity of regulated channels together with decreased sediment supply from mountainous parts.

ACS Style

Václav Škarpich; Miroslav Kubín; Tomáš Galia; Stanislav Ruman; Jan Hradecký. Impacts of gravel-bed rivers transformation on fluvial ecosystems and human society: Examples from the Czech flysch Carpathians. E3S Web of Conferences 2018, 40, 02005 .

AMA Style

Václav Škarpich, Miroslav Kubín, Tomáš Galia, Stanislav Ruman, Jan Hradecký. Impacts of gravel-bed rivers transformation on fluvial ecosystems and human society: Examples from the Czech flysch Carpathians. E3S Web of Conferences. 2018; 40 ():02005.

Chicago/Turabian Style

Václav Škarpich; Miroslav Kubín; Tomáš Galia; Stanislav Ruman; Jan Hradecký. 2018. "Impacts of gravel-bed rivers transformation on fluvial ecosystems and human society: Examples from the Czech flysch Carpathians." E3S Web of Conferences 40, no. : 02005.

Journal article
Published: 01 September 2018 in Ecological Engineering
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ACS Style

T. Galia. Controls on log step occurrence in steep headwater streams draining Carpathian managed forests. Ecological Engineering 2018, 120, 384 -396.

AMA Style

T. Galia. Controls on log step occurrence in steep headwater streams draining Carpathian managed forests. Ecological Engineering. 2018; 120 ():384-396.

Chicago/Turabian Style

T. Galia. 2018. "Controls on log step occurrence in steep headwater streams draining Carpathian managed forests." Ecological Engineering 120, no. : 384-396.

Journal article
Published: 26 August 2018 in Science of The Total Environment
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European multi-thread rivers have undergone rapid morphological changes during past centuries due to the extensive direct and indirect human impacts on fluvial systems. As a consequence, we can identify altered patterns of bed sediment calibre reflecting disturbed sediment connectivity and modified flow hydraulics. Changes in the grain-sizes of samples collected on 68 gravel bars in August 2015 were studied along 14.0-km river reach of the Bečva River (Outer Western Carpathian Mts., Czech Republic). The grain-size characteristics obtained were confronted with modeled flow hydraulics and the present stage of the channel. The studied channel reach is presently characterized by several distinctive sections: for a long time (ca. 100 years) regulated single channel sections with artificial bank stabilizations incised several meters in the floodplain and by contrast, multi-thread channel patterns of two sections, which have witnessed retrograde development after large floods in 1997 and 2010 with 100- and 50-year recurrence intervals, respectively. The present channel behaviour of managed (regulated) and re-naturalized (multi-thread) river sections corresponded well with the modeled hydraulic variables for one-year discharge recurrence interval. Especially, re-naturalized river sections showed lower values of flow competence which facilitated the deposition of sediment material in the form of gravel bars. The high occurrence of lateral sediment sources (e.g., tributaries, bank failures) together with sediment disconnectivities (e.g., boulder ramps) in the longitudinal river reach were observed, and grain-size parameters did not particularly reflect the hydraulic conditions. Especially tributaries as sediment inputs had significant effect on bar grain size and increase of channel diversity, although, in general results indicate a gradual downstream fining.

ACS Style

Václav Škarpich; Tomáš Galia; Stanislav Ruman; Zdeněk Máčka. Variations in bar material grain-size and hydraulic conditions of managed and re-naturalized reaches of the gravel-bed Bečva River (Czech Republic). Science of The Total Environment 2018, 649, 672 -685.

AMA Style

Václav Škarpich, Tomáš Galia, Stanislav Ruman, Zdeněk Máčka. Variations in bar material grain-size and hydraulic conditions of managed and re-naturalized reaches of the gravel-bed Bečva River (Czech Republic). Science of The Total Environment. 2018; 649 ():672-685.

Chicago/Turabian Style

Václav Škarpich; Tomáš Galia; Stanislav Ruman; Zdeněk Máčka. 2018. "Variations in bar material grain-size and hydraulic conditions of managed and re-naturalized reaches of the gravel-bed Bečva River (Czech Republic)." Science of The Total Environment 649, no. : 672-685.

Journal article
Published: 01 August 2018 in CATENA
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Karel Šilhán; Radek Tichavský; Tomáš Galia; Václav Škarpich. Hydrogeomorphic activity in ungauged Mediterranean gorges: Specifics of tree ring data-based study. CATENA 2018, 167, 90 -99.

AMA Style

Karel Šilhán, Radek Tichavský, Tomáš Galia, Václav Škarpich. Hydrogeomorphic activity in ungauged Mediterranean gorges: Specifics of tree ring data-based study. CATENA. 2018; 167 ():90-99.

Chicago/Turabian Style

Karel Šilhán; Radek Tichavský; Tomáš Galia; Václav Škarpich. 2018. "Hydrogeomorphic activity in ungauged Mediterranean gorges: Specifics of tree ring data-based study." CATENA 167, no. : 90-99.

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Published: 01 June 2018 in Geomorphology
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Although large wood (LW) has been intensively studied in forested basins of humid temperate climates, data on LW patterns in different fluvial environments are rather scarce. Therefore, we investigated the dimensions, characteristics, longitudinal distribution, and dynamics of LW along a 4.05-km-long reach of an ephemeral channel typical of European Mediterranean mountainous landscape (Sfakiano Gorge, Crete, Greece). We analysed a total of 795 LW pieces, and the mean observed abundance of LW was generally lower (14.3 m3/ha of active valley floor or 19.6 LW pieces/100 m of stream length) than is usually documented for more humid environments. The number of LW pieces was primarily controlled by trees growing on the valley floor. These living trees acted as important LW supply agents (by tree throws or the supply of individual branches with sufficient LW dimensions) and flow obstructions during large flood events, causing storage of transported LW pieces in jams. However, the downstream transport of LW is probably episodic, and large jams are likely formed only during major floods; after >15 years, we still observed significant imprints of the last major flood event on the present distribution of LW. The geomorphic function of LW in the studied stream can only be perceived to be a spatially limited stabilising element for sediments, which was documented by a few accumulations of coarse clastic material by LW steps and jams.

ACS Style

T. Galia; V. Škarpich; R. Tichavský; L. Vardakas; K. Šilhán. Longitudinal distribution and parameters of large wood in a Mediterranean ephemeral stream. Geomorphology 2018, 310, 15 -28.

AMA Style

T. Galia, V. Škarpich, R. Tichavský, L. Vardakas, K. Šilhán. Longitudinal distribution and parameters of large wood in a Mediterranean ephemeral stream. Geomorphology. 2018; 310 ():15-28.

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T. Galia; V. Škarpich; R. Tichavský; L. Vardakas; K. Šilhán. 2018. "Longitudinal distribution and parameters of large wood in a Mediterranean ephemeral stream." Geomorphology 310, no. : 15-28.

Journal article
Published: 01 June 2018 in CATENA
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Tomáš Galia; Radek Tichavský; Václav Škarpich; Karel Šilhán. Characteristics of large wood in a headwater channel after an extraordinary event: The roles of transport agents and check dams. CATENA 2018, 165, 537 -550.

AMA Style

Tomáš Galia, Radek Tichavský, Václav Škarpich, Karel Šilhán. Characteristics of large wood in a headwater channel after an extraordinary event: The roles of transport agents and check dams. CATENA. 2018; 165 ():537-550.

Chicago/Turabian Style

Tomáš Galia; Radek Tichavský; Václav Škarpich; Karel Šilhán. 2018. "Characteristics of large wood in a headwater channel after an extraordinary event: The roles of transport agents and check dams." CATENA 165, no. : 537-550.

Journal article
Published: 26 May 2018 in Forest Ecology and Management
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The effect of instream wood on stream hydraulics and geomorphic processes depends on wood and channel dimensions. We investigated abundance and characteristics (i.e., wood orientation, proportion of spanned channel width, stability and decay classes) of large wood (LW; defined here as having a length ≥ 1 m and a diameter ≥ 0.1 m) and small wood (SW; including two categories with length ≥ 0.5 m and diameter ≥ 0.1 m or length ≥ 1 m and diameter ≥ 0.05 m) in three steep, confined headwater channels of medium-high mountain ranges of the Western Carpathians (Central Europe). Results show that SW is more frequent than LW, however, active-channel LW load varied between 26 and 305 m3∙ha−1, whereas SW showed much lower active-channel load (8–16 m3∙ha−1). Differences between LW and SW active-channel volumes were considerably smaller in streams under dominant deciduous canopy. In these streams, morphological steps – created exclusively by SW – were more frequent than LW steps. This higher frequency of SW in streams surrounded by a deciduous tree canopy can be explained by the continuous supply of branches rather than entire dead trees. On the other hand, the volume and frequency of LW was related to the proportion of conifers in the valley corridor. We observe very high active-channel load in two channel reaches for which values exceeded most of those observed in similarly small streams across the globe. We also observe an unusually large proportion of instream wood (both LW and SW) oriented parallel to the flow direction, which might suggest a higher mobility of bed material in the flysch-dominated headwater channels of our study site.

ACS Style

Tomáš Galia; Virginia Ruiz-Villanueva; Radek Tichavský; Karel Šilhán; Matej Horacek; Markus Stoffel. Characteristics and abundance of large and small instream wood in a Carpathian mixed-forest headwater basin. Forest Ecology and Management 2018, 424, 468 -482.

AMA Style

Tomáš Galia, Virginia Ruiz-Villanueva, Radek Tichavský, Karel Šilhán, Matej Horacek, Markus Stoffel. Characteristics and abundance of large and small instream wood in a Carpathian mixed-forest headwater basin. Forest Ecology and Management. 2018; 424 ():468-482.

Chicago/Turabian Style

Tomáš Galia; Virginia Ruiz-Villanueva; Radek Tichavský; Karel Šilhán; Matej Horacek; Markus Stoffel. 2018. "Characteristics and abundance of large and small instream wood in a Carpathian mixed-forest headwater basin." Forest Ecology and Management 424, no. : 468-482.