Abstract
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.
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References
Benda L, Andras K, Miller D, et al. (2004) Confluence effects in rivers: Interactions of basin scale, network geometry, and disturbance regimes. Water Resour Res 40(5): 1–15. https://doi.org/10.1029/2003WR002583
Benda L, Hassan MA, Church M, et al. (2005) Geomorphology of steepland headwaters: transition from hillslopes to channels. J Am Water Resour Assoc 41(4): 835–851. https://doi.org/10.1111/j.1752-1688.2005.tb03773.x
Bíba M, Oceánská Z, Vícha Z, et al. (2006) Forest-hydrological research in small experimental catchments in the Beskydy Mountains. J Hydrol Hydromech 54(2): 113–122. (In Czech)
Bombino G, Gurnell AM, Tamburino V, et al. (2009) Adjustments in channel form, sediment calibre and vegetation around check-dams in the headwater reaches of mountain torrents, Calabria, Italy. Earth Surf Process Landf 34: 1011–1021. https://doi.org/10.1002/esp.1791
Borja P, Molina A, Govers G, et al. (2018) Check dams and afforestation reducing sediment mobilization in active gully systems in the Andean mountains. Catena 165: 42–53. https://doi.org/10.1016/j.catena.2018.01.013
Brummer CJ, Montgomery DR (2003) Downstream coarsening in headwater channels. Water Resour Res 39(10): 1–14. https://doi.org/10.1029/2003WR001981
Bunte K, Abt SR (2001) Sampling surface and subsurface particle size distributions in wadable gravel- and cobble-bed streams for analyses in sediment transport, hydraulics and streambed monitoring. Gen. Tech. Rep. RMRS–GTR-74. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 1–409.
Church M, Kellerhals R (1978) On the statistics of grain size variation along a gravel river. Can J Earth Sci 15(7): 1151–1160. https://doi.org/10.1139/e78-121
Czech Geological Survey (CGS) (2019) Map of ground instabilities 1: 10000. Available online at: http://mapygeology.cz/svahove_nestability/ (Accessed on 5 June 2019)
Dawson M (1988) Sediment size variation in a braided reach of the Sunwapta River. Earth Surf Process Landf 13(1–2): 599–618. https://doi.org/10.1002/esp.3290130705
Ferguson R, Cudden J, Hoey T, et al. (2006) River system discontinuities due to lateral inputs: generic styles and controls. Earth Surf Process Landf 31(9): 1149–1166. https://doi.org/10.1002/esp.1309
Fryirs KA, Brierley GJ, Preston NJ, et al. (2007) Buffers, barriers and blankets: The (dis)connectivity of catchment-scale sediment cascades. Catena 70(1): 49–67. https://doi.org/10.1016/j.catena.2006.07.007
Galia T, Hradecký J (2012) Critical conditions for beginning of coarse sediment transport in torrents of Moravskoslezské Beskydy Mts (Western Carpathians). Carpathian J Earth Environ Sci 7(4): 5–14.
Galia T, Hradecký J (2014) Morphological patterns of headwater streams based in flysch bedrock: Examples from the Outer Western Carpathians. Catena 119: 174–183. https://doi.org/10.1016/j.catena.2014.02.013
Galia T, Škarpich V, Hradecký J (2015) Connectivity of the coarsest fraction in headwater channels: imprints of fluvial processes and debris — flow activity. Geogr Ann Ser A-phys Geogr 97(3): 437–452. https://doi.org/10.1111/geoa.12086
Galia T, Škarpich V (2016) Do the coarsest bed fractions and stream power record contemporary trends in steep headwater channels. Geomorphology 272: 115–126. https://doi.org/10.1016/j.geomorph.2015.07.047
Golden AR, Springer GS (2006) Hydraulic geometry, median grain size, and stream power in small mountain streams. Geomorphology 78(1–2): 64–76. https://doi.org/10.1016/j.geomorph.2006.01.031
Heitmuller F, Hudson P (2009) Downstream trends in sediment size and composition of channel-bed, bar, and bank deposits related to hydrologic and lithologic controls in the Llano River watershed, central Texas, USA. Geomorphology 112(3–4): 246–260. https://doi.org/10.1016/j.geomorph.2009.06.010
Hradecký J, Pánek T (2008) Deep-seated gravitational slope deformations and their influence on consequent mass movements (case studies from the highest part of the Czech Carpathians). Nat Hazards 45(2): 235–253. https://doi.org/10.1007/s11069-007-9157-7
Ichim I, Radoane M (1990) Channel sediment variability along a river: a case study of the Siret River (Romania). Earth Surf Process Landf 15(3): 211–225. https://doi.org/10.1002/esp.3290150304
Knighton AD (1980) Longitudinal changes in size and sorting of stream bed material in four English Rivers. Geol Soc Am Bull 91(1): 55–62. https://doi.org/10.1130/0016-7606(1980)91<55:LCISAS>2.0.CO;2
Lambert BC (1997) The effects of hillslope and fluvial processes on particle size of the stream bed at the watershed, reach and within-reach scales in a fifth-order mountain stream [master’s thesis]. Oregon State University, Oregon, USA.
Leopold LB (1992) Sediment size that determines channel morphology. In: Billi P et al. (eds.), Dynamics of Gravel-bed Rivers. John Wiley & Sons. Chichester, United Kingdom. pp 297–311. https://doi.org/10.1002/esp.3290180510
Menčík E, Adamová M, Dvořák J, et al. (1983) Geology of the Moravskoslezské Beskydy Mountains and Podbeskydská pahorkatina hilly country. Ústřední Ústav Geologický, Praha. (In Czech)
Rice S, Church M (1998) Grain size along two gravel-bed rivers: statistical variation, spatial pattern and sedimentary links. Earth Surf Process Landf 23(4): 345–363. https://doi.org/10.1002/(SICI)1096-9837(199804)23:4<345::AID-ESP850>3.0.CO;2-B
Rice S, Ferguson RI, Hoey TB (2006) Tributary control of physical heterogeneity and biological diversity at river confluences. Can J Fish Aquat Sci 63(11): 2553–2566. https://doi.org/10.1139/f06-145
Rice S, Greenwood M, Joyce C (2001) Tributaries, sediment sources, and the longitudinal organisation of macroinvertebrate fauna along river systems. Can J Fish Aquat Sci 58(4): 824–840. https://doi.org/10.1139/f01-022
Rice S (1998) Which tributaries disrupt downstream fining along gravel-bed rivers. Geomorphology 22(1): 39–56. https://doi.org/10.1016/S0169-555X(97)00052-4
Surian N (2002) Downstream variation in grain size along an alpine river: analysis of controls and processes. Geomorphology 43(1–2): 137–149. https://doi.org/10.1016/S0169-555X(01)00127-1
Swanson BJ, Meyer G (2014) Tributary confluences and discontinuities in channel form and sediment texture: Rio Chama, NM. Earth Surf Process Landf 39(14): 1927–1943. https://doi.org/10.1002/esp.3586
Vianello A, D’Agostino V (2007) Bankfull width and morphological units in an alpine stream of the dolomites (Northern Italy). Geomorphology 83(3–4): 266–281. https://doi.org/10.1016/j.geomorph.2006.02.023
Wistuba M, Sady A, Poręba G (2018) The impact of Wallachian settlement on relief and alluvia composition in small valleys of the Carpathian Mts. (Czech Republic). Catena 160: 10–23. https://doi.org/10.1016/j.catena.2017.08.017
Wohl EE (2010) Mountain Rivers Revisited. Washington, DC: American Geophysical Union. p 573.
Wohl EE, Wilcox A (2005) Channel geometry of mountain streams in New Zealand. J Hydrol 300(1–4): 252–266. https://doi.org/10.1016/j.jhydrol.2004.06.006
Wolman MG (1954) A method of sampling coarse riverbed material. Trans Am Geophys Union 35(6): 951–956.
Acknowledgements
This research was supported by the University of Ostrava (Grant no. SGS02/PřF/2019–2020). The authors wish to thank two anonymous referees for providing very useful and critical comments that greatly improved the quality of the initial manuscript.
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Smažák, I., Galia, T. Influence of tributaries on downstream bed sediment grain sizes under flysch conditions. J. Mt. Sci. 18, 847–862 (2021). https://doi.org/10.1007/s11629-020-6182-4
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DOI: https://doi.org/10.1007/s11629-020-6182-4