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Wyszukujesz frazę "surface level" wg kryterium: Temat


Tytuł:
Topological Fragmentation of Medical 3D Surface Mesh Models for Multi-Hierarchy Anatomical Classification
Autorzy:
Zwettler, G. A.
Backfrieder, W.
Powiązania:
https://bibliotekanauki.pl/articles/226172.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
3D surface mesh
functional classification in medicine
multi-hierarchy classification
level of detail
spline-based surface selection
Opis:
High resolution 3D mesh representations of patient anatomy with appendant functional classification are of high importance in the field of clinical education and therapy planning. Thereby, classification is not always possible directly from patient morphology, thus necessitating tool support. In this work a hierarchical mesh data model for multi-hierarchy anatomical classification is introduced, allowing labeling of a patient model according to various medical taxonomies. The classification regions are thereby specified utilizing a spline representation to be placed and deformed by a medical expert at low effort. Furthermore, application of randomized dilation allows conversion of the specified regions on the surface into fragmented and closed sub-meshes, comprising the entire anatomical structure. As proof of concept, the semi-automated classification method is implemented for VTK library and visualization of the multihierarchy anatomical model is validated with OpenGL, successfully extracting sub-meshes of the brain lobes and preparing classification regions according to Brodmann area taxonomy.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 129-136
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania możliwości technicznych pomiaru płaskości powierzchni kinematyczną metodą trygonometryczną
Researches on technical possibilities of flatness examination using kinematic trigonometric method
Autorzy:
Wyczałek, I.
Plichta, A.
Wyczałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/371964.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płaskość
poziom powierzchni
tachimetr zmotoryzowany
pomiar kinematyczny
flatness
motorized tachymeter
surface level
kinematic measurement
Opis:
Nowe podejście do pomiaru płaskości posadzek lub innych powierzchni poziomych bazuje na użyciu sensorów montowanych na pojeździe przemieszczającym się po tych powierzchniach w mniej lub bardziej zautomatyzowany sposób. Staje się ono konkurencyjne w stosunku do metod klasycznych wykorzystujących łatę i klin lub pochyłomierze przykładane w miejscu pomiaru, a także do stosowanych zamiennie metod geodezyjnych. Pomiar z użyciem pojazdów wymaga z jednej strony przemieszczania sensorów wzdłuż zadanych linii, z drugiej - odpowiedniej częstości i precyzji odczytów. Prowadzone są prace badawczo-wdrożeniowe nad wykonywaniem kinematycznych pomiarów tachimetrycznych do pryzmatu przemieszczanego na posadzce. Prace te obejmują dwa aspekty: zdolność pomiarową instrumentów oraz precyzję oceny płaskości w funkcji przemieszczania pryzmatu w określonych kierunkach na badanej powierzchni. Tematy te stanowią przedmiot prac naukowo-badawczych i są okresowo publikowane. W ramach niniejszej pracy wykonano próby kinematycznego pomiaru zmotoryzowanym tachimetrem (RTS) Leica TCRP 1201+ do pryzmatu przemieszczanego na zdalnie sterowanym pojeździe stosowanym w modelarstwie i robotyce. Opracowano modele pomiaru (różne warianty skanowania), poddano analizie wiarygodność reprezentacji osi pomiarowej przez uśrednianie między dwoma kołami pojazdu oraz wykonano testy mające na celu stwierdzenie poprawności pomiaru wykorzystanym typem tachimetru do poruszającego się celu. Testowano oba warianty skanowania: (i) wzdłuż zadanych linii oraz (ii) wzdłuż dowolnie dobranych linii, uzyskując zbliżone wyniki (nieprzekraczające 10%). W efekcie przeprowadzonych badań uznano, że przyjęte tezy znajdują potwierdzenie a tym samym stwierdzono, że zastosowane podejście może być stosowane do pomiarów płaskości posadzek.
The new approach for measuring the flatness of floors or other horizontal surfaces is based on the use of vehicle-mounted sensors that moves through these surfaces in a more or less automated way. It becomes competitive in relation to the classical methods using the straightedge and the wedge or tilts or geodetic methods used interchangeably. The measurement with vehicles requires, on the one hand, the movement of the sensors along the set lines, and on the other - the appropriate frequency and precision of the readings. Research and implementation works on the implementation of kinematic tacheometric measurements to the prism moved on the floor are still underway. These works cover two aspects: the measurement capability of the instruments and the precision of evaluation of flatness as a function of prism movement in certain directions on the tested area. These topics are the subject of scientific research and are periodically published. As the part of this work, kinematic measurements of the Leica TCRP 1201+motorized tacheometer (RTS) have been performed to the prism mounted on a remote-controlled vehicle used in modeling and robotics. Measurement models (different scan variants) were developed, the reliability of the measurement axes' position by averaging between two wheels of the vehicle was analyzed, and tests that enabled determination of the accuracy of the totalizer-type measurement for the moving target were performed. Both scan variants were tested: (i) along fixed lines and (ii) along individually defined lines, obtaining comparable results (not exceeding 10%). As a result of the research, it was concluded that the adopted theses were confirmed and thus the applied approach could be used for measuring flatness of the floor.
Źródło:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2017, 165 (45); 49-65
1895-7323
Pojawia się w:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extreme sea levels at selected stations on the Baltic Sea coast
Autorzy:
Wolski, T.
Wisniewski, B.
Giza, A.
Kowalewska-Kalkowska, H.
Boman, H.
Grabbi-Kaiv, S.
Hammarklint, T.
Holfort, J.
Lydeikaite, Z.
Powiązania:
https://bibliotekanauki.pl/articles/47831.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
Baltic coast
sea level
storm surge
fall
sea surface
surface deformation
wind speed
wind stress
Źródło:
Oceanologia; 2014, 56, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical aspects of extreme storm surges and falls on the Polish coast
Autorzy:
Wisniewski, B.
Wolski, T.
Powiązania:
https://bibliotekanauki.pl/articles/49192.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
atmospheric precipitation
atmospheric pressure
deformation
evaporation
fall
meteorological factor
Polish coast
sea level
sea surface
storm surge
water density
water exchange
wind stress
wind velocity
Opis:
Extreme sea levels – storm-generated surges and falls – on the Polish coast are usually the effects of three components: the volume of water in the southern Baltic (the initial level preceding a given extreme situation), the action of tangential wind stresses in the area (wind directions: whether shore- or seaward; wind velocities; and wind action duration), and the sea surface deformation produced by deep, mesoscale baric lows moving rapidly over the southern and central Baltic that generate the so-called baric wave. Among these factors, the baric wave is particularly important for, i.e. the water cushion underneath the baric depression, moving along the actual atmospheric pressure system over the sea surface.
Źródło:
Oceanologia; 2011, 53, (1-TI)
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial characteristics of water conductivity in the surface level of Polish arable soils
Autorzy:
Walczak, R
Ostrowski, J.
Witkowska-Walczak, B.
Slawinski, C.
Powiązania:
https://bibliotekanauki.pl/articles/26447.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
surface level
Polska
water permeability
soil
water conductivity
water retention
arable soil
water balance
Źródło:
International Agrophysics; 2002, 16, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of global climate oscillations on intermonthly to interannual variability of sea levels along the English Channel Coasts (NW France)
Autorzy:
Turki, I.
Massei, N.
Laignel, B.
Shafiei, H.
Powiązania:
https://bibliotekanauki.pl/articles/2079277.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sea level
interannual variability
storm
atmospheric circulation
climatic oscillation
sea surface temperature
sea level pressure
North Atlantic oscillation
English Channel
Opis:
This work examines the multiscale variability in sea level along the English Channel coasts (NW France) using a wavelet multiresolution decomposition of water level values and climate oscillations in order to gain insights in the connection between the global atmospheric circulation and the local-scale variability of the monthly extreme surges. Changes in surges have exhibited different oscillatory components from the intermonthly (~3–6-months) to the interannual scales (~1.5-years, ~2–4-years, ~5–8-years) with mean explained variances of ~40% and ~25% of the total variability respectively. The correlation between the multiresolution components of surges and 28 exceptional stormy events with different intensities has revealed that energetic events are manifested at all timescales while moderate events are limited to short scales. By considering the two hypotheses of (1) the physical mechanisms of the atmospheric circulation change according to the timescales and (2) their connection with the local variability improves the prediction of the extremes, the multiscale components of the monthly extreme surges have been investigated using four different climate oscillations (Sea Surface Temperature (SST), Sea-Level Pressure (SLP), Zonal Wind (ZW), and North Atlantic Oscillation (NAO)); results show statistically significant correlations with ~3–6-months, ~1.5-years, ~2–4-years, and ~5–8-years, respectively. Such physical links, from global to local scales, have been considered to model the multiscale monthly extreme surges using a time-dependent Generalized Extreme Value (GEV) distribution. The incorporation of the climate information in the GEV parameters has considerably improved the fitting of the different timescales of surges with an explained variance higher than 30%. This improvement exhibits their nonlinear relationship with the large-scale atmospheric circulation.
Źródło:
Oceanologia; 2020, 62, 2; 226-242
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shoulder girdle muscle activity and fatigue during automobile chassis repair
Autorzy:
Tian, Baozhen
Yu, Suihuai
Chu, Jianjie
Li, Wenhua
Powiązania:
https://bibliotekanauki.pl/articles/2161964.pdf
Data publikacji:
2019-07-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
muscle activity
surface electromyography
muscle fatigue
perceived level of discomfort
automobile chassis repair
shoulder postures
Opis:
Objectives The objective of this study was to assess the postures that were commonly used in automobile chassis repair operations, and to evaluate shoulder girdle muscle fatigue for different combinations of the weight of hand-tools. Material and Methods Two right muscles, including upper trapezius (UT) and middle deltoid (MD), were selected. Surface electromyography (SEMG) and a perceived level of discomfort (PLD) were used to assess the degree of shoulder girdle fatigue. Fifteen healthy young male subjects from the Northwestern Polytechnical University participated in the test. The test consisted of assuming 4 different postures and maintaining each of them for 60 s. The 4 postures varied in terms of dumbbell weights, standing for the hand-tools weight: W1 was 0.48 kg and W2 was 0.75 kg; the 4 shoulder postures were shoulder flexions of 150°, 120°, 90°, and 60°, combined with an included elbow angle of 180°, 150°, 120° and 90°, respectively. The experimental sequences were randomly selected. The signals of SEMG and the values of PLD in the shoulder girdle were recorded in 60 s. All subjects completed the whole test. The repeated measure analysis of variance (ANOVA) was performed to ascertain differences between dumbbell weight (0.48 kg and 0.75 kg) and shoulder postures (150°/180°, 120°/150°, 90°/120° and 60°/90°). The Friedman test was utilized to determine the significant differences for UT(PLD) and MD(PLD) on shoulder postures. Spearman’s correlation was used to analyze the relationship between the subjective and objective measurements. Results Significant correlational relationships existed between the UT percentage of the maximal voluntary electrical activation (%MVE) and UT(PLD) (r = 0.459, p < 0.01), between MD(%MVE) and MD(PLD) (r = 0.821, p < 0.01). The results showed that SEMG and PLD of the 4 postures under analysis differed significantly (p < 0.05). Conclusions It was indicated that posture T4 (shoulder forward flexion 60° and included elbow angle 90°) resulted in the lowest fatigue, both in terms of the objective measure and the subjective perception, which meant that this posture was more ergonomic. Int J Occup Med Environ Health. 2019;32(4):537–52
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2019, 32, 4; 537-552
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Great Lagoon (Szczecin Lagoon) water salinity - once again
O zasoleniu wody w Wielkim Zalewie Szczecińskim raz jeszcze
Autorzy:
Poleszczuk, G.
Niedzwiecki, E.
Wolnomiejski, N.
Bucior, A.
Powiązania:
https://bibliotekanauki.pl/articles/85121.pdf
Data publikacji:
2005
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
Szczecin Lagoon
water salinity
fresh water
ionic composition
measurement station
water sample collection
bottom water
salinity level
surface water
salinity degree
chloride concentration
marine-inland water
mineralization
Opis:
Between May and October of 2003, mineral composition of surface (0.5 m deep) and bottom (5.0 meters) waters, at measurement stations in north-western and south-eastern parts of Great Lagoon (Szczecin Lagoon), have been studied. Total concentrations of ionic macrocomponents: Na+, K+, Ca2+, Mg2+, Cl-, HCO3 - , SO4 2- have been determined. Differentiation of ionic composition and changing level of concentrations of ionic macrocomponents in waters, depending on location of measurement station, depth of water sample collection and time of examination, have been proved. Bottom waters in south-eastern part of Great Lagoon had highest salinity level, whereas surface waters in the same location had lowest degree of salinity. Taking into consideration relatively small number of measurements, authors of present paper regard outlined investigations as diagnostic and obtained conclusions as preliminary ones. Towards substantial variability in ionic composition and magnitudes of concentrations, it is practically impossible to forecast and define values of concentrations of individual ionic components and general salinity degrees, basing on chlorides concentrations, what was often pursued, until now.
W roku 2003 w okresie od maja do października oznaczano stężenia ogólne makroskładników jonowych (Na+, K+, Ca2+, Mg2+, Cl-, SO4 2-, HCO3 - ) i na podstawie tych oznaczę obliczano przybliżone wartości zasolenia wód Wielkiego Zalewu (Zalew Szczeciński). Próby wody do badań pobierano w miejscach stacji pomiarowych zlokalizowanych w północnozachodniej (stacja nr 1) i w południowo-wschodniej (stacja nr 2) czesciach Zalewu. Wodę czerpano z warstwy powierzchniowej (z głębokości ok. 0,5 m) i naddennej (z głębokości ok. 5,0 m). Próby wody do badań pobierano z częstotliwością raz w miesiącu. Ze względu na niedużą liczbę pomiarów, badania te traktowano jako rozpoznawcze, zaś ich wyniki – jako ustalenia wstępne. Badania potwierdziły znany wcześniej fakt znacznego zróżnicowania składu jonowego i stężenia substancji mineralnych w wodach Wielkiego Zalewu w zależności od miejsca poboru prób i głębokości, z jakiej próby pobierano. Wody naddenne były wyraźnie bardziej zasolone od wód powierzchniowych i to na obu ww. stacjach, przy czym – co było dość zaskakujące – bardziej zasolone były wody naddenne w południowowschodniej części Zalewu. Jeżeli chodzi o wody powierzchniowe, to – jak było też wiadome z wcześniejszych badań – bardziej zasolone były wody w północnej części Zalewu. Z równań regresji liniowej, ujmujących zależności pomiędzy wartościami stężeń poszczególnych składników mineralnych a stężeniami jonów chlorkowych, a także z równań ujmujących zależności pomiędzy łącznymi masami makroskładników jonowych zawartych w 1 dm3 wód (oznaczanymi w tekście pracy jako ż ion m ) – także ze stężenia jonów chlorkowych, w wodach na obu stacjach i w obu badanych warstwach wynika, że istotne statystycznie korelacje uzyskano jedynie dla stężeń Na+ i K+ oraz Emion – przy czym wartości stałej i współczynnika w równaniu regresji liniowej – dla każdej z 4 kategorii wód (2 stacje × 2 warstwy wody) – były wyraźnie różne. Związane to było z zachodzeniem w ekosystemie Zalewu (wzdłuż drogi spływu wód w dół estuarium) przemian prowadzących do zmiany składu chemicznego wód. Ustalenia te wskazują, że wyniki obliczeń składu jonowego wód i zasolenia wykonywane na podstawie ogólnych (uśrednionych) dla całego Wielkiego Zalewu równań korelacyjnych ujmujących zależność pomiędzy stężeniami wybranych składników makrojonowych wód oraz ich ogólnego zasolenia od stężenia chlorków mogą prowadzić do otrzymania wyników znacznie różniących się od wartości rzeczywistych. W tej sytuacji jedynym i najpewniejszym sposobem na ustalenie składu jonowego i wartości stężeń wybranych makroskładników jonowych oraz zasolenia ogólnego wód jest wykonanie odpowiednich oznaczeń stężeń wszystkich składników makrojonowych wód Wielkiego Zalewu.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2005, 09
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the reduction of geodetic and gravimetric measurements on technogenic and geodynamic polygons
Autorzy:
Perovych, Lev
Perovych, Igor
Gorlachuk, Valeriy
Powiązania:
https://bibliotekanauki.pl/articles/145497.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przyspieszenie grawitacyjne
grawitacja
korekta
correction
gravitational acceleration
level surface
gravity reduction
Opis:
When conducting geodetic and gravimetric measurements, there is a problem of projecting them to the reference surface. Since the gravitational field is inhomogeneous under the real conditions, the problem arises of determining the corrections to the measured values of gravitational acceleration in order to use the obtained data for the subsequent solutions of projection problems. Currently, the solution to this problem is performed using a Bouguer reduction, which requires information about the internal structure of the upper layer of the earth’s surface, topography, etc. The purpose of this study is to develop a methodological approach that would allow to determine the reduction (projection) corrections for gravitational acceleration on technogenic and geodynamic polygons without using data about the distribution of surface layer density and topography. The research process is based on the use of mathematical analysis methods and a wide range of experimental geodetic and gravimetric measurements. In the course of the performed researches, an algorithm was obtained and a practical implementation of the determination of the corrections in the measured values of gravitational acceleration on the basis of geodetic and gravimetric measurements was carried out at the certain geodynamic polygon in order to bring all corrections to one level surface.
Źródło:
Geodesy and Cartography; 2020, 69, 1; 65-72
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recharge and drainage of lakes in the Powidzki Landscape Park in conditions of increased anthropogenic and environmental pressure (central-western Poland)
Autorzy:
Nowak, Bogumił Michał
Przybyłek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2058553.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
surface resources
groundwater resources
hydraulic contacts
water level changes
mining dewatering
evapotranspiration
Gniezno Lakeland
Opis:
The lakes of the Powidzki Landscape Park (Gniezno Lakeland) are known for their natural and recreational values. The majority of them are located within two large glacial tunnel valleys, that in many places cut through several levels of till and inter-till aquifers. Regional hydraulic linkage systems are developed where surface water and groundwater remain in direct contact. Smaller water bodies occur between the lakes, in other tunnel valleys, in isolated meltwater basins, or in river valleys. These water bodies constitute local drainage bases. The existence in the area of such morphologically diverse lakes with different flow rates, varied morphology, and heterogeneous geological structure permitted tracing of the hydrodynamic dependencies of lake catchments of various types. Hydrogeological cross-sections, comparative analyses of structural maps for successive aquifers, bathymetric plans of lakes, and piezometric contour maps were prepared. Surface and groundwater level fluctuations were investigated, as well as their response to changing atmospheric conditions. Water balances of lakes were also determined for selected lake catchments. The study showed that all the lakes analysed are closely related to groundwater, and that the deepest ones reach lower aquifers. The majority of the lakes drain the aquifers, but some of the lakes feed them. Such a situation was documented in coastal wetlands and in the eastern part of the Park, affected by a depression cone associated with a nearby lignite opencast mine. The study showed that the deepest of the lakes analysed have a very wide catchment area of groundwater recharge, expanding beyond the boundaries of their surface catchment areas. This is important for the development of their resources, especially in periods of hydrogeological low flow.
Źródło:
Geological Quarterly; 2020, 64, 1; 205--219
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation of energy for diapycnal mixing in the Baltic Sea due to internal wave drag acting on wind-driven barotropic currents
Autorzy:
Nohr, C.
Gustafsson, B.G.
Powiązania:
https://bibliotekanauki.pl/articles/48609.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
North Sea
barotropic motion
computation
deep water
halocline
internal wave
saline water
sea level
seasonal thermocline
shallow water
stratification
surface area
turbulent mixing
water exchange
wind force
Opis:
The pathways of energy supply for mixing the deep waters of the Baltic Sea is largely unknown. In this paper, a parameterization of the internal wave drag forces on barotropic motion is developed and implemented into a two-dimensional shallow water model of the Baltic Sea. The model is validated against observed sea levels. The dissipation of barotropic motion by internal wave drag that is quantified from the model results show that breaking internal waves generated by wind forced barotropic motions can contribute significantly to diapycnal mixing in the deep water of the Baltic Sea.
Źródło:
Oceanologia; 2009, 51, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal Patterns of Quality Surface Water Changes
Autorzy:
Mitryasova, Olena
Pohrebennyk, Volodymyr
Salamon, Ivan
Oleksiuk, Alina
Mats, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/1839615.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
surface water quality
water security
hydrochemical indicators
level of pollution
resistance degree of pollution
Inhulets river
Opis:
The dynamics of hydrochemical parameters of surface waters from the upper, middle and lower reaches of the river was analyzed. On the basis of the analysis of temporal and spatial monitoring data, a comprehensive assessment of the environmental status of the Inhulets river (Ukraine) waters by hydrochemical indicators was carried out. The study performed a comparative analysis of the river water quality assessment using different methods: an integrated assessment based on the calculation of water pollution indexes, pollution rate. A result of the evaluation of water quality in certain classes: in terms of ammonium ions and BOD5 – III quality class, the water is slightly polluted; phosphate content – V quality class, water is very low in the bottom; according to the content of suspended solids, in phosphates and BOD5 – III class of water quality, water is polluted; by a concentration of chlorides – V class of quality, degree of purity – very dirty; the value of suspended solids and chlorides – III class; in terms of the sulfate content – IV class. In general, the very excessive concentration of substances in the middle course remains stable, the environmental state is poor (quality class IV).
Źródło:
Journal of Ecological Engineering; 2021, 22, 4; 283-295
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions for the formation of outflow and its characteristics in river basins of the Lublin Region
Autorzy:
Michalczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/25378.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
outflow level
outflow formation
Polska
Krzna River
rainfall water
river basin
Bug River
water reserve
Tanew River
surface outflow
Vistula River
Lublin region
Źródło:
International Agrophysics; 1998, 12, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water relations during two hydrological years in swampy areas in the Siemianice Forest Experimental Station
Autorzy:
Krysztofiak, A.T.
Miler, A.T.
Powiązania:
https://bibliotekanauki.pl/articles/62494.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
water relation
hydrology
swamp area
Siemianice Forest Experimental Station
forest experimental station
ground water level
surface water level
climate change
Marianka Forest District
forest environment
water resource
water condition
Opis:
In recent years researchers have focused increasingly on climatic changes taking place in nature (increasing air temperature, decreasing precipitation totals). These imply changes in components of water balances and in practice changes in water relations both on the global and local scale. At present site overdrying is considered to be the biggest threat [Pierzgalski 2007]. The aim of the study is to present water relations in the forest swampy areas in a forest district (the Marianka Forest District) of the Siemianice Forest Experimental Station in hydrological years of 2005 and 2006. The investigations showed that analysed catchments, despite being located in swampy areas, are characterized by periods of water depletion in ditches. In analysed watercourses runoff was recorded from mid-November 2004 to the beginning of June 2005, while in the next hydrological year it was recorded again from mid-November, but this time longer to mid-June 2006. In relation to ground water of the catchment area a predictable relationship was observed of the water table level at the locations of observation wells. The wells located in the top sections of the catchment had water table the deepest below the ground level, while wells in valleys had water tables at the most shallow levels. It may also be stated that wells situated in higher areas (watershed), are characterized by a slightly bigger variation in the ground water table during the year than it was the case with wells located at lower points (in valleys). Both analyzed hydrological years (2005 and 2006) showed a similar pattern of ground water table at individual sites. Moreover, a marked cyclicity was recorded in the elevation of the water table, i.e. water level rising in autumn and lowering in summer months (as a result of changes in plant transpiration). The relationship of ground water levels with different forest sites found in the analyzed catchments confirms the dependence on the site moisture level variant. Water was lying at the most shallow levels in the ash-alder swamp forest site – a marshy site, while it was markedly the deepest in fresh mixed coniferous forest sites – a fresh site type. When analyzing changes in the ground water levels in terms of stand age classes we may clearly observe the seasonal variation and similar patterns of changes. Water lay the most shallow in stands of age classes V and VI. The level was significantly deepest in age class IV. The above dependencies pertained both to the hydrological year 2005 and 2006.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2008, 06
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł

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