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Wyszukujesz frazę "river channel processes" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Influence of Extreme Discharge on Restoration Works In Mountain River – A Case Study of the Krzczonówka River (Southern Poland)
Autorzy:
Lenar-Matyas, A.
Korpak, J.
Mączałowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/124376.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mountain river maintenance
river channel processes
artificial riffle
debris dam reconstruction
Opis:
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.
Źródło:
Journal of Ecological Engineering; 2015, 16, 3; 83-96
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Channel Processes and the Need to Forecast Deformations of the Stryi Riverbed
Autorzy:
Hnativ, Ihor
Balkovskyi, Volodymyr
Cherniuk, Volodymyr
Panas, Natalia
Korinec, Yuri
Yakhno, Oleh
Hnativ, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2086425.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mountain river
surface water
channel processes
shore protection
riverbed deformation
denudation processes
Opis:
Deformations of the channel are a consequence of the development of denudation processes in the basin area, increase in the volume of solid runoff and deposition of debris of the rock, its fractional redistribution in the channels, which especially increase during floods and flooding. They cause changes in the hydrological regime and structure of the river system, the destruction of residential and commercial buildings, as well as the infrastructure in the floodplain. Trends, magnitudes and intensity of deformations of riverbeds are formed by a complex of natural and man-made factors. Neglecting the planned and high-altitude displacements of riverbeds often leads to unpredictable consequences. Washing the shore can cause a gas or oil pipeline to rupture, leading to a strong explosion and fire, as well as oil pollution and environmental damage. Channel processes are associated with the washing of bridge piers, power lines, significant material losses and even human casualties during floods and flooding. The aim of the work is to analyze the development of channel processes in the basin of the river Stryi and forecast the deformation of its channel. The results of the analysis show that the riverbeds of Prykarpattia are very unstable and are characterized by intense erosion of the banks and bottom, which is caused by the influence of various factors. It is a man-made activity that includes the development of gravel quarries in floodplains and riverbeds and their straightening, runoff regulation, changes in forestry and land use. Natural factors, such as climate change and water runoff, etc., are also affected. It was found that the bed of the river Stryi does not have a stable shape, significantly changed the configuration, significantly reduced multi-sleeved and increased its straightness, and in some places the river changed its position by 60–80 meters. Restoration works carried out in some parts of the riverbed during this period were not effective enough. Water in different parts of the riverbed washes the shores, which causes dangerous landslides that occur directly near the riverbed. In these areas, it is necessary to more effectively carry out measures to regulate runoff and restore shore protection.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 187--195
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes of Natural Self-Cleaning of Small Watercourses with Increasing Anthropogenic Load in the Dniester River Basin
Autorzy:
Hnativ, Roman
Cherniuk, Volodymyr
Khirivskyi, Petro
Kachmar, Natalia
Lopotych, Natalia
Hnativ, Ihor
Powiązania:
https://bibliotekanauki.pl/articles/2202373.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mountain river
surface waters
small river
natural self-cleaning
hydrodynamically active area
channel processes
Opis:
Small river basins are complex self-regulatory systems, as well as indicators of the state of the environment due to the level of anthropogenic pressure. Since any changes in the regime of small rivers are reflected in the entire hydrographic chain, the problem of estimating the anthropogenic load on small rivers of Ukraine is relevant for modern hydrochemistry and hydroecology. The main sources of water pollution are industrial and domestic effluents, which increase the inflow of pesticides, heavy metal ions, etc. Aquatic ecosystems of small rivers are subject to intense mechanical and biochemical effects, and about 80% of pollutants are washed into water bodies. Water bodies located on the territory or near large cities and urban areas are particularly exposed to man-made pollution. In the territory of the Dniester river basin, natural landscapes are maximally preserved in comparison with other regions of Western Ukraine, but in modern conditions we observe an increase in the negative anthropogenic impact on the quality of natural waters. Hydrodynamic barriers or hydrodynamically active areas (HAA) of mountain rivers, which are significantly saturated with oxygen in the water flow, which activates the processes of biochemical and biological self-cleaning of natural waters, are important to increase the efficiency of self-purification processes. Natural biological cleaning of pollutants in small rivers is highly effective due to the overgrowth of aquatic vegetation. The aim of the work was to establish the ability of the aquatic ecosystem of a small river to self-purify on the basis of hydrochemical indicators of water quality. The compliance with sanitary and hygienic requirements of hydrochemical indicators of Kolodnytsia river water of the right tributary of the Dniester was analyzed and possible regularities of their changes were established, as well as the main factors of anthropogenic impact on a small river and the possibility of laboratory modeling of such rivers. It was found that in the Kolodnytsia River the processes of self-cleaning are quite active, which are caused by the hydrological characteristics of the river and the presence of hydrodynamically active areas in the foothills of the basin. Therefore, at present there is no steady excess of pollutants relative to the MPC.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 12--18
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of horizontal displacements and changes of the riverine area of the Dniester River
Autorzy:
Shevchuk, Volodymyr
Burshtynska, Khrystyna
Korolik, Iryna
Halochkin, Maksym
Powiązania:
https://bibliotekanauki.pl/articles/1844327.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
channel processes
Dniester River
monitoring
riverbed displacements
riverine areas
satellite images
supervised classification
topographic maps
Opis:
The article discusses the monitoring of horizontal displacements of the channel of Dniester, the second largest river in Ukraine, based on topographic maps, satellite images, as well as geological, soil and quaternary sediment maps. Data processing has been carried out using the geographic information system ArcGIS. The monitoring over a 140-year period (1874–2015) has been performed at the river’s transition from a mountainous to plain terrain on the 67 km section of the river. During this period, maximum displacements in the study area were 590–620 m. The research examines water protection zones needed for channel displacements. The article describes the monitoring methodology and analyses changes over a period of 18 years (2000–2018). The analysis includes the anthropogenic influence on the channel in the monitoring area. Results of the research may be useful for construction and cadastral works related to the channel in the area concerned, as well as for water management.
Źródło:
Journal of Water and Land Development; 2021, 49; 1-15
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oddziaływanie obiektów hydrotechnicznych na morfologię koryt rzek ziemi kłodzkiej w świetle analizy GIS : zarys problemu i zamierzenia badawcze
The impact of hydrotechnical engineering facilities on the morphology of rivers under Klodzko County GIS analysis : an outline of the problem and research plans
Autorzy:
Witek, M.
Białobrzeska, M.
Powiązania:
https://bibliotekanauki.pl/articles/294757.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
koryta uregulowane
zabudowa hydrotechniczna
procesy fluwialne
typologia koryta
GIS
regulated river channels
hydrotechnical engineering
fluvial processes
channel typology
Opis:
Jednym z elementów środowiska przyrodniczego, poddanego niezwykle silnej ingerencji człowieka, są wody powierzchniowe, a w szczególności rzeki. Koryta rzek ziemi kłodzkiej zostały antropogenicznie przekształcone i w różnym stopniu uregulowane, wzniesiono w nich budowle hydrotechniczne różnego typu oraz przeznaczenia. Rzeki te w okresie wiosennych roztopów i letnich ulewnych opadów często są źródłem powodzi lub lokalnych podtopień. Istotne jest zatem określenie wpływu obecności obiektów hydrotechnicznych i systemów regulacji w korytach rzek tego regionu. Autorki opracowania postanowiły przyjrzeć się temu zagadnieniu, wykorzystując narzędzia dostępne w oprogramowaniu GIS. Artykuł jest wynikiem wstępnego etapu badań nad zagadnieniem wpływu obiektów hydrotechnicznych na funkcjonowanie koryt. Głównym celem opracowania, a także dalszych prac, jest próba odpowiedzi na pytanie, czy obecność konkretnych konstrukcji hydrotechnicznych w znaczącym stopniu wpływa na sposób funkcjonowania koryta oraz czy zastosowanie nowoczesnych metod analizy danych przestrzennych pozwoli na dokładniejsze określenie tego wpływu. Na podstawie kartowania terenowego dokonano typologii koryt w oparciu o analizę ich cech w profilu podłużnym z wykorzystaniem metody analizy odcinków, a następnie zobrazowano otrzymane wyniki przy użyciu narzędzi oprogramowania GIS. Przeprowadzono szczegółowe obserwacje w sąsiedztwie budowli piętrzących, które ujawniły wpływ tych obiektów na zmianę typów lub podtypów koryta, a co za tym idzie na zmianę dominujących procesów korytowych. Przekształcenia procesów korytowych są odmienne w poszczególnych przypadkach i uwarunkowane wieloma czynnikami, których rozpoznanie będzie celem dalszych prac.
Among the elements of natural environment which have suffered from a very strong human interference are surface waters, particularly rivers. The Kłodzko County rivers' channels have been anthropogenically transformed and regulated in various levels; hydraulic stuctures of various types and purpose have been built there. These rivers often inundate their valleys or cause local flooding during spring thaw and summer downpours. It is important to determine the effect of the presence of hydrotechnical facilities and channelization schemes in the river channels of the region. The authors decided to develop a look at this issue using the tools available in GIS software. The article is the result of initial stage of research. The main objective of the paper, and the future work, is an attempt to answer the question, whether the presence of hydraulic structures significantly affects the processes in the river channels and whether the use of modern methods of spatial data analysis will allow more accurate determination of the impact. Based on field mapping, river typology has been done. An analysis of river characteristics was performed in the longitudinal profile using the method of river section analysis, and then the results were illustrated using the GIS software tools. Detailed research has been conducted in the vicinity of dam structures, what revealed the influence of these objects on changes of types and subtypes of the channel and furthermore on change of dominating channel processes. Evolution of nature of these processes varies in particular cases and depends on many factors, which recognition of is the goal of upcoming research.
Źródło:
Landform Analysis; 2012, 20; 103-116
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromorphological conditions of the lower Vistula in the development of navigation and hydropower
Uwarunkowania hydromorfologiczne dolnej Wisły w rozwoju żeglugi i hydroenergetyki
Autorzy:
Babiński, Z.
Habel, M.
Powiązania:
https://bibliotekanauki.pl/articles/397164.pdf
Data publikacji:
2013
Wydawca:
ENERGA
Tematy:
fluvial processes
channel pattern
morphodynamics of sandbars
inland navigation
hydropower
Lower Vistula River
procesy fluwialne
typy koryt
morfodynamika łach
żegluga śródlądowa
hydroenergetyka
dolna Wisła
Opis:
The article presents general principles of development of the lower Vistula channel in the Holocene period, with a particular emphasis on the unintentional human interference in the fluvial processes associated with deforestation and cultivation of cereals and root crops. It also characterises the basic hydraulic engineering works in the form of construction of embankments, adjustment of the bed and construction of the Włocławek barrage as factors of deliberate human interference and their impact on channel changes. The article characterises morphological and morphodynamic conditions of the basic bed forms, i.e. sandy and gravel bars and pools determining the possibility of river transport, and its development in time and space (depth of navigable route). Perspectives of multi-directional hydraulic development are presented, including the main cascade developments of the lower Vistula. The article presents the opportunities for a comprehensive use of the waterway, which forms route E40 in the section of the lower Vistula, taking into account sustainable development and compensation in the form of restoration of the valley bottom.
W artykule przedstawiono ogólne prawidłowości rozwoju koryta dolnej Wisły w okresie holocenu, ze szczególnym uwzględnieniem nieświadomej ingerencji człowieka w procesy korytowe, związane z wylesianiem i uprawą zbóż oraz roślin okopowych. Scharakteryzowano podstawowe prace hydrotechniczne w postaci budowy wałów przeciwpowodziowych, regulacji koryta i budowy stopnia wodnego we Włocławku jako czynników świadomej działalności człowieka i ich wpływ na zmiany koryta. Scharakteryzowano warunki morfologiczne i morfodynamiczne podstawowych form korytowych, tj. łach piaszczysto-żwirowych i plos, warunkujących możliwości istnienia transportu rzecznego, jego rozwoju w czasie i przestrzeni (głębokość szlaku żeglownego). Przedstawiono perspektywy wielokierunkowej zabudowy hydrotechnicznej, w tym głównie skaskadowania dolnej Wisły. Zaprezentowano możliwości kompleksowego wykorzystania drogi wodnej, jaką jest E40 w odcinku dolnej Wisły, z uwzględnieniem zrównoważonego rozwoju i rekompensaty w postaci rewitalizacji dna doliny.
Źródło:
Acta Energetica; 2013, 2; 83-96
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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