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Analysing riverbed morphology as a response to changes of geological and neotectonic conditions: A case study of the oľšava river

Dušan Barabas

Dušan Barabas

Institute of Geography, Pavol Jozef Šafárik University in KošiceKošice, Slovak Republik
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Barabas, Dušan
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Matúš Tkáč

Matúš Tkáč

Institute of Geography, Pavol Jozef Šafárik University in KošiceKošice, Slovak Republik
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Tkáč, Matúš
  
10. Sept. 2019
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Online veröffentlicht: 10. Sept. 2019
Seitenbereich: 109 - 122
Eingereicht: 10. Mai 2019
DOI: https://doi.org/10.2478/quageo-2019-0033
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© 2019 Dušan Barabas, Matúš Tkáč published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Fig. 1

Geological and tectonic structure of the Oľšava river catchment (A), geomorphological units of the Oľšava catchment area (B), the location of the basin (C).
Geological and tectonic structure of the Oľšava river catchment (A), geomorphological units of the Oľšava catchment area (B), the location of the basin (C).

Fig. 2

The longitudinal profile of the Oľšava river valley showing the boundaries of the assessed segments. The top of the figure depicts transverse profiles of the Oľšava valley documenting the change in the width of the valley and its asymmetry.
The longitudinal profile of the Oľšava river valley showing the boundaries of the assessed segments. The top of the figure depicts transverse profiles of the Oľšava valley documenting the change in the width of the valley and its asymmetry.

Fig. 3

The average width of the riverbed (left axis) and the depth of the channel (right axis) in the measured Oľšava River longitudinal profile section.
The average width of the riverbed (left axis) and the depth of the channel (right axis) in the measured Oľšava River longitudinal profile section.

Fig. 4

Bar areas on the left (Sľ), centre (Ss) and right side (Sp).
Bar areas on the left (Sľ), centre (Ss) and right side (Sp).

Fig. 5

Graph of individual parameters in the Oľšava flow measured section.Left axis: total area of bars ΔSl [m2], total area of the channel ΔSvp [m2], flow surface channel ΔS [m2]. Right axis: height/width valley Vf, width/depth water level, and flow surface/area of bars K.
Graph of individual parameters in the Oľšava flow measured section.Left axis: total area of bars ΔSl [m2], total area of the channel ΔSvp [m2], flow surface channel ΔS [m2]. Right axis: height/width valley Vf, width/depth water level, and flow surface/area of bars K.

Fig. 6

Graph of the different parameters in the Oľšava measured section.Left axis: section riffle type [m], channel gradient index SL. Right axis: average channel segment slope and degree of sinuosity.
Graph of the different parameters in the Oľšava measured section.Left axis: section riffle type [m], channel gradient index SL. Right axis: average channel segment slope and degree of sinuosity.

Correlation matrix of the individual Oľšava flow parameters in the segments of the mapped sections_

type river reach [m]average width of river bed [m]area of the bars ΔSl [m2]total area of the channel ΔSvp [m2]water area ΔS [m2]water area/area bars [K]stream gradients [SL]slope segmentsheight/width valley [Vf]sinuosity index
type river reach [m]–
average width of river
bed [m]−0.9089–
area of the bars ΔSl0.00040.3437–
[m2]
total area of the chan-−0.67580.81960.5862–
nel ΔSvp [m2]
water area ΔS [m2]−0.74470.83590.45020.9873–
water area/area bars
[K]−0.81810.5971−0.40020.47330.6001–
stream gradients [SL]0.2060−0.04600.4379−0.0413−0.1313−0.5419–
slope segments0.9576−0.90160.0121−0.6263−0.6926−0.76540.2821–
height/width valley−0.81580.76030.16370.81120.86200.7471 −0.1214−0.7021–
[Vf]
sinuosity index−0.40780.2685−0.5840−0.2729−0.18630.4380 −0.1873−0.44960.0689–
Index width/depth water level0.6817−0.65680.0603−0.2456−0.2827−0.47140.33720. 7426−0.1801−0.5676

Basic parameters of evaluated segments of the longitudinal profile of the Oľšava River_

segmentsaltitude [m a.s.l.]lenghthight/width valley (Vf)stream lenght gradiet index (SL)average slope segments [%]width valley [m]average slope segments [°]sinuosity index
minmax
1174.5175.01675.95.1915.960.0298384.160.017071.030
2175.0200.09856.31.59121.020.2536241.020.145301.495
3200.0207.31490.96.17204.430.48961237.460.280521.042
4207.3222.09051.83.4359.910.16241318.800.093051.604
5222.0265.09686.55.33121.620.44391060.460.254301.569
6265.0305.05795.12.26135.670.6902550.250.395501.212
7305.0456.011692.20.26140.931.291553.000.739901.296
8456.0504.01596.70.08128.313.006210.001.721911.112
9504.0774.03469.70.15135.007.781720.004.449601.056
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