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Wyszukujesz frazę "erosion process" wg kryterium: Temat


Tytuł:
Riverbed erosion estimation in the selected cross-sections of the upper Vistula River
Autorzy:
Lapuszek, M.
Tematy:
riverbed erosion
river regulation
Vistula River
river channel
technical regulation
erosion process
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Powiązania:
https://bibliotekanauki.pl/articles/60197.pdf  Link otwiera się w nowym oknie
Opis:
The analysis of time variability of riverbed elevation recorded at eight cross-sections of the Upper Vistula River is presented in the paper. The variability is analyzed on the base on the observed low annual water stages and the cross-sectional geometry variation observed over decades. Furthermore, the analysis of riverbed changes in the years 2001 – 2011 was done in 16 cross-sections located between the Koło and Zawichost gauging stations. Based on the analyzed changes in the riverbed elevation of the eight tested gauging stations it should be noted that since the beginning of the observation period, that is from about the beginning of the 20th century to the mid 1960’s, in the Upper Vistula River riverbed erosion can be observed with a slight tendency for accumulation. As a result of technical regulations of the river channel of the Vistula River from km 247 +000 to 295 +000 carried out in the years 1975 to 1982, intensive processes of riverbed erosion has occured. In most of the 16 profiles it was found that in the years 2001-2011 the river channel was deepened. The occurrence of local riverbed deepening at the river banks was also observed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of the Surface Runoff of the Rivers of the Carpathian Region during the Urbanization of Slope Areas
Autorzy:
Hnativ, Roman
Yakhno, Oleh
Hnativ, Ihor
Tematy:
anthropogenic load
water object
pollution of riverbed
erosion process
bottom sediment
ecological indicator
channel process
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Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:
https://bibliotekanauki.pl/articles/24201783.pdf  Link otwiera się w nowym oknie
Opis:
Anthropogenic factors cause an increase in the impact on the natural system as a whole and its components. An increase in the intensity of this influence is predicted in the 21st century, and its forms are very diverse and unevenly distributed across the globe. This is most noticeable in industrialized countries, but at the same time this influence largely depends not only on the industrial potential and the level of technology, but also on the population density and urbanization of territories. Currently, much attention is being paid to the ecological problems of river catchments, which are significantly transformed as a result of technogenic influence on the natural environment. Surface runoff of water and sediments is usually formed in the river basin as slope runoff entering the river network. The river basin regulates the surface runoff formed as a result of atmospheric precipitation, which discretely falls on its surface, transferring a significant part of it into the underground runoff. The state of forest landscapes plays an important role in the formation of floods in the Dniester basin. The forest performs important ecological functions, including water protection and soil protection. Forests stabilize soils, preventing their erosion. The presence of a sufficient area of forests contributes to the regulation of surface runoff and the hydrological regime, the prevention of soil erosion and the stabilization of riverbeds. The use of water and mineral resources, construction on the banks of rivers and the laying of engineering communications through them are always different forms of artificial influence on the natural course of channel processes, which change it to varying degrees. Measures that change the channel-forming activity of the river, disrupt the flow of sediments, or radically change the hydraulic characteristics and structure of the flow have a particularly negative impact. The generalization of the dynamics of the channel process and ecological indicators within the territories of the Carpathian region will allow us to assess their impact on the state of the river network, the change in the quality of natural waters, and predict floods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental aspects of soil surface sealing and compaction
Autorzy:
Debicki, R
Lipiec, J.
Tematy:
root system
soil erosion process
erosion
wind erosion
compaction
soil surface
environmental aspect
plant growth
physical degradation
irrigation water
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Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/802969.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents some environmental impacts caused by two important factors of physical degradation of the soil, i.e., soil surface sealing/crusting phenomena and soil compaction. It can be concluded that despite numerous literature on the subject as well as the Authors' own data collected in model laboratory and field experiments, it is still difficult to judge to what extent the effects of those two processes are negative for both the soil environment and the plant growth.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phenomenological technique for prediction of cavitation erosion performance
Autorzy:
Gireń, B. G.
Welzant, A.
Baran, P.
Tematy:
cavitation erosion
material performance
performance evaluation
wear
erosion process modelling
International Cavitation Erosion Test
erozja kawitacyjna
wydajność materiału
ocena wydajności
zużycie
modelowanie procesów erozji
Międzynarodowy Kawitacyjny Test Erozyjny
Pokaż więcej
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:
https://bibliotekanauki.pl/articles/1818504.pdf  Link otwiera się w nowym oknie
Opis:
Purpose: Major aim of the work was to formulate 2-parameters models of the cavitation erosion process and to bring about the particular methods for prediction of its performance with due calculation formulas. Design/methodology/approach: Phenomenological model of the erosion supplemented with functional relationships between calculation parameters and the strength parameters stand for the foundations of the method. Having assumed the probabilistic nature of the process and fatigue regime of the material destruction, the volume loss in time has been determined as proportional to the integral of the appropriate probability function. Correlations between parameters have been derived by adjusting the computed erosion curves to the experimental ones for the vast diversity of the cases. Findings: Two different formulas for the volume loss of the material in time under cavitation loading have been derived. Research limitations/implications: Results obtained from both the International Cavitation Erosion Test program as well as the own experiments carried out at the rotating disk set-up supplied necessary experimental data. Preliminary verification of the method soundness was completed. Assumption on the independence of the calculation parameters on the loading conditions have been taken. The approach is valid provided the defined relationships are also independent on the type and amplitude of the loading. Practical implications: Achieving the objectives is expected to result in developing a technique for assessment of the material damage under cavitation loadings. Numerical implementation of the model completed with the derived functional relationships stand for a tool, enabling a prospective user to predict the material performance under defined cavitation loading. Originality/value: New formulas for calculating the efficiency of cavitation erosion, inferred from the models of high physical clarity are the original contribution to the methodology and techniques concerned.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content of Cu, Zn and Mn in the eroded soils of a small arable-forest catchment of West Pomerania [The Chojna District]
Autorzy:
Chudecka, J
Tematy:
Pomeranian region
Polska
arable-forest catchment
water erosion
Chojna district
erosion process
geochemical background
soil
soil property
eroded soil
degraded ecosystem
anthropogenic ecosystem
heavy metal
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Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1449154.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this paper was to assess differentiation in the total content of Cu, Zn and Mn under the influence of water erosion. The present author investigated parent material, eroded soils and delluvial sediments of a small arable-forest catchment of the moraine zone in West Pomerania. The average content of heavy metals in the parent rock (boulder light loam) were assumed as geochemical backgrounds of Cu, Zn and Mn. It was found out that erosion process caused differentiation in heavy metals. Zinc was the most mobile in this transportation; Mn was not sensitive to it. Delluvial sediments from arable (drainage) depressions had a clearly lower content of Cu and Zn than the parent material. It was also noted that Cu and Zn content in the forest area was lower than in the arable area of a similar relief and soil composition. Mn content was always higher in the arable soils. Soil-forming processes influenced differentiation of heavy metals in the vertical soil profile. The humus and Bt horizons (accumulation of silicate clay) were enriched with heavy metals. A decrease of heavy metal content was noticed in the eluvial horizon (Eet - outwash of silicate clay). The humus horizon of the investigated soil had, a natural (not increased) content of Cu, Zn and Mn.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sklad chemiczny wody rzecznej w terenie lessowym
Chemical composition of river water in loess region
Autorzy:
Glinski, P
Glinski, J.
Tematy:
Wyzyna Lubelska
tereny lessowe
hydrologia
wody powierzchniowe
rzeki
rzeka Ciemiega
wody rzeczne
jakosc wody
ocena jakosci
sklad chemiczny
gleby
lessy
procesy erozyjne
Lublin Upland
loess area
hydrology
surface water
river
Ciemiega River
river water
water quality
chemical composition
soil
loess
erosion process
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1401769.pdf  Link otwiera się w nowym oknie
Opis:
W pracy przedstawiono wyniki 2-letnich badań jakości wód powierzchniowych rzeki Ciemięgi, przepływającej przez urzeźbione rolnicze tereny lessowe Wyżyny Lubelskiej. Stwierdzono, że jakość wód w okresie badań nie była zagrożona procesami erozyjnymi wpływającymi na ich skład chemiczny. Skład chemiczny tych wód był wynikiem głównie procesów geochemicznych
Two years`investigations of water quality of Ciemiegga river situated in eroded loess region fully agriculturally used were conducted in 1996 and 1997. It was found that chemical composition of river water was not affected by erosion processes, except of phosphorus compounds. It was only under the geochemical processes.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
L’erosione della funzione legislativa in Polonia
Autorzy:
Serowaniec, Maciej
Witkowski, Zbigniew
Tematy:
funzione legislativa
parlamento
processo legislativo
Costituzione della Repubblica di Polonia
L’erosione della funzione legislativa in Polonia
legislative process
parliament
law making process
Constitution of the Republic of Poland
erosion of legislative process in Poland
Pokaż więcej
Wydawca:
Wyższa Szkoła Gospodarki Euroregionalnej im. Alcide De Gasperi w Józefowie
Powiązania:
https://bibliotekanauki.pl/articles/1807268.pdf  Link otwiera się w nowym oknie
Opis:
La macchina legislativa parlamentare ‘rigurgita’ leggi coniate sulla base di un chiaro input governativo, e successivamente la macchina esecutiva implementa tali leggi, senza tenere conto dei principi e degli standard legislativi adottati nel mondo democratico. Nessun soggetto, dell’attuale partito al potere, prende in considerazione il fatto che la legge così formata e implementata diventa una farsa legale, in quanto – come dicevano già gli antichi Romani – da un atto illecito non può nascere un diritto (Ex iniuria ius non oritur). In questo modo si sta addirittura creando un modello di ‘legislazione indecente’ .
The parliamentary legislative apparatus “spits out” the laws made to order by politicians, and, then, the executive apparatus uses the laws produced in accordance with this political order without taking into account any established principles and universally accepted legislative standards in the democratic world. No one from the ruling group wants to acknowledge that such a law made to be applied on a ‘political order is merely an appearance of law’.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Dune Erosion on the Coast of South Baltic Sea Taking into Account Dune Landslide Processes
Autorzy:
Szmytkiewicz, P.
Zabuski, L.
Tematy:
South Baltic coastal zone
dunes
erosion
landslide process
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Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:
https://bibliotekanauki.pl/articles/240996.pdf  Link otwiera się w nowym oknie
Opis:
An analysis was carried out to determine the influence of landslide process at a few meters depth under the dune surface on the rebuilding of the dune. In the first step, calculations were done using the XBEACH model to determine seabed rebuilding as well as shore and dune undercutting for the assumed hydrologic and hydrodynamic conditions. Next, the obtained tachymetric profile of the dune and beach was fed into the FLAC2D program, and calculations of stress distribution, displacements and stability conditions were made. In this way, landslide movement was identified. The theoretical investigations clearly prove that waves attacking the dune not only cause surface erosion, but also trigger a landslide within the dune mass to a maximum depth of about 5 m. It results in a lowering of the dune crown by about 0:6 0:7 m. Numerical models such as XBEACH, SBEACH or CSHORE do not take into account landslide occurrence, and thus underestimate dune erosion.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for prediction of cavitation erosion performance in hydro-turbines based on the two-parameter phenomenological model
Autorzy:
Gireń, B. G.
Noińska-Macińska, M.
Tematy:
cavitation erosion
materials performance
performance evaluation
random process modelling
wear
Pokaż więcej
Wydawca:
Gdańska Szkoła Wyższa
Powiązania:
https://bibliotekanauki.pl/articles/1191846.pdf  Link otwiera się w nowym oknie
Opis:
Two-parameter phenomenological model for quantification of the cavitation damage process in its initial — incubation stage inspired by Förster energy migration theory is presented in the paper. The model built was supplemented with functional relationships between calculation parameters and strength parameters of the materials derived for chosen cavitation loading conditions. Experiments at the rotating disk set-up have been carried out in order to obtain necessary experimental data. The values of calculation parameters have been determined by adjusting the theoretical erosion curve to experimental one. Preliminary experimental verification of the model soundness consisted in comparing theoretical to experimental results obtained from both the ICET program and the experimental investigations of the cavitation erosion at Banki-Michel turbine blades. Reliability as well as the sources of inaccuracy and uncertainties were also discussed. The far-reaching aim of the work is to create the calculation tool for prediction of cavitation erosion performance in hydro-turbines during their operating cycle.
Dostawca treści:
Biblioteka Nauki
Artykuł

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