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1
Content available Influence of Extreme Discharge on Restoration Works In Mountain River – A Case Study of the Krzczonówka River (Southern Poland)
Lenar-Matyas A., Korpak J., Mączałowski A.
Journal of Ecological Engineering
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2015
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Vol. 16, nr 3
83--96
EN
The research was conducted on the Krzczonówka River channel, one of the gravel-bedded, regulated mountain river in Polish Carpathians. The main morphological and ecological problem of the river was lack of sediment and channel down cutting. The area is currently associated with an on-going project called “the Upper Raba River Spawning Grounds”. Lowering of an existing debris dam on Krzczonówka River is a part of the project. In 2013 twelve artificial riffles have been created by heaping up stones at points within the segment of the river channel below the debris dam. The riffles are to introduce variety to the longitudinal profile of the river and to reduce the river’s slope. Consequently, these are to decrease sediment transport and to prevent further deepening of the river channel. Post-project monitoring of river restoration works is conducted to determine channel changes and development. In May, 2014, extreme flooding occurred, which caused unexpected changes in channel development. This paper describes maintenance work performed in the riverbed of the Krzczonówka River. Observations and calculations concerning changes in conditions of water flow and sediment transport are also presented. The main purpose is to characterize the influence of an extreme flow event on morphology and functioning of the recently restored gravel-bed river.
2
Content available Geomorphologic effects of river engineering structures in Carpathian fluvial systems
Korpak J.
Landform Analysis
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2010
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Vol. 14
34-44
EN
Long stretches of Carpathian river channels have been engineered, which has had an impact on their morphology and functioning. Three different river engineering periods have been identified for Carpathian Mountain rivers - different in terms of the type of work performed and its intensity. The first period covers the third quarter of the 20th century, when a large number of structures (groynes, weirs, debris dams) were built causing significant changes to river channels. The aforesaid structures led to a significant reduction in the amount of alluvia present in river channels, as did large scale gravel removal projects and land use changes in the catchment. The second period (1977-1996) was characterized by a rather small number of river engineering projects. This was the result of a relative lack of major floods during this time period. Channel gradient reduction with use of drop structures was the primary "fix" at the time. It contributed to further reductions in the amount of alluvia present and led to channel deepening, although at a slower rate. The third period (post-1997) was characterized by renewed engineering efforts, which were primarily a response to the occurrence of major floods that helped destroy old hydraulic structures and alter river channels. New types of "natural" engineering structures began to emerge, which were designed to imitate natural channel forms such as rapids. The principal morphologic outcomes of river engineering efforts were the transformation of braided channels into single-thread channels as well as channel deepening and narrowing. River engineering efforts produced the largest changes in channel morphology between 1950 and 1976. Long stretches of river channels were incised as deep as solid rock. Today, the primary fluvial process transforming river channels in the Carpathian Mountains is downcutting
3
Wpływ budowli regulacyjnych i poboru rumowiska na koryta rzek i potoków górskich - wybrane przykłady z rzek karpackich
Korpak J., Krzemień K., Radecki-Pawlik A.
Gospodarka Wodna
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2009
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Nr 7
274-281
PL
Artykuł pokazuje wpływ wybranych systemów regulacyjnych na negatywne zmiany w korytach rzek karpackich. Jako przykładowe wybrano koryta: Białego Dunajca i potoku Mszanka. Dodatkowo zwrócono uwagę na problem nielegalnego poboru rumowiska z koryt rzecznych i jego wpływu na degradację koryt.
EN
The article demonstrates the influence of chosen regulation systems on negative changes in beds of the Carpathian rivers. As examples were chosen: Biały Dunajec river and Mszanka stream. Additionally, the authors indicate the problem of illegal river rock debris collection and its influence on the degradation of riverbeds.
4
Content available remote Wpływ działalności człowieka na funkcjonowanie górskich systemów fluwialnych
Korpak J., Krzemień K., Radecki-Pawlik A.
Czasopismo Techniczne. Architektura
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2009
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R. 106, z. 2-A
55-61
PL
W artykule przedstawiono współczesny stan wiedzy o przyczynach zmian karpackich koryt oraz ich reakcji na różne interwencje. Zaprezentowano też kilka nowoczesnych, alternatywnych rozwiązań w kwestii zarządzania górskimi systemami fluwialnymi.
EN
The article demonstrates the present state of knowledge about the reasons of Carpathian channel changes and channel response to various interferences. A range of modern alternative solutions in the matter of mountain fluvial system management is also presented.
5
Content available Rola maksymalnych wezbrań w funkcjonowaniu systemów uregulowanych koryt górskich
Korpak J.
Landform Analysis
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2008
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Vol. 8
41--44
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