Temat: water flux - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Soil water, solute storage and drainage in a deeply loosened, heavy-clay soil of Southern Romania
Autorzy:: Paltineanu, C.
Powiązania:: https://bibliotekanauki.pl/articles/25993.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: soil water flux
soil water
Romania
internal drainage
heavy clay soil
leaching
water flux
drainage
solute storage
Źródło:: International Agrophysics; 2003, 17, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The velocity oriented approach revisited
Autorzy:: Nawalany, M.
Zijl, W.
Powiązania:: https://bibliotekanauki.pl/articles/2063027.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: velocity oriented approach
continuity of water flux
groundwater flow modeling
Opis:: A great deal of hydrogeological situations requires an extremely accurate calculation of the 3-dimensional groundwater discharge rates in the subsoil. Examples are: hydrology of wetlands, water balances of aquatic ecosystems depending on groundwater recharge, river-groundwater interaction, advective transport of pollution underneath waste disposal sites, particle trajectories in aquifer-aquitard systems with contrasting heterogeneities and many others. Numerical determination of the vertical groundwater velocity is a notoriously difficult problem. In nature this component may be two or three orders of magnitude smaller than the horizontal velocity components. In such cases application of Darcy’s law to the numerically calculated hydraulic heads obtained from a finite difference or finite element model may lead to relatively inaccurate vertical velocities. More specifically, when estimating vertical velocity components in cases where the Dupuit approximation – negligible vertical head gradient – holds, numerical differentiation of hydraulic heads yields zero vertical velocity. In the 1980s of the last century Zijl and Nawalany proposed to invert the order of calculating the velocity field by eliminating the head from Darcy’s law and to consider the Darcy velocity as the primary variable. For 2-dimensional flow this was already common practice and the challenge was a 3-dimensional extension, which was called the Velocity Oriented Approach (VOA). In two dimensions such methods were conventionally based on a stream function as primary variable. However, at that time application of a 3D stream function was not feasible and, therefore, the Darcy velocity itself was considered as the primary variable. This approach has been proven to yield a high accuracy for all three components of the specific discharge, including the relatively small vertical component, especially in cases where the subsoil is smoothly heterogeneous in the horizontal directions. In the 1990s the mixed-hybrid finite element method was developed. The physical interpretation of this method shows the way how to liberate the VOA from its smoothness requirement by introduction of a practical applicable 3D stream function. In conclusion, the velocity oriented approach indicates a change in paradigm regarding the accurate calculation of specific discharge in groundwater flow.
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2010, 441 Hydrogeologia z. 10; 113--121
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wykorzystanie testu Production Logging dla określenia stref dopływu wody do studni wielkośrednicowych
Production Logging test for determining zones of water flux to large diameter wells
Autorzy:: Zawisza, L.
Macuda, J.
Gądek, W.
Nowak, J.
Powiązania:: https://bibliotekanauki.pl/articles/350794.pdf
Data publikacji:: 2007
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: Production Log
studnie wielkośrednicowe
przepływ wody do otworu
large diameter wells
water flux
Opis:: W artykule przedstawiono metodykę pomiarów, sposoby prezentacji danych oraz wyniki interpretacji profilowań zarejestrowanych sondą Production Log (PL) w ramach testu produkcyjnego w otworach hydrogeologicznych. Dla zobrazowania opisanej metodyki pomiarów produkcyjnych i ich interpretacji przedstawiono wyniki analizy pomiarów z otworu M-1 służącego jako studnia dostarczająca wodę termalną, otworu K-3 przeznaczonego do zrzutu zasolonych wód kopalnianych oraz otworu geotermalnego SS-1.
Measurement methodic, data presentation modes and results of interpretation of profiling made with the use of a Production Log (PL) within a production test in hydrogeologic wells are presented in the paper. The described measuring methodic and interpretation are presented on the example of data from the geothermal well M-1, well K-3 for discharging mine's waste brine, and geothermal well SS-1.
Źródło:: Górnictwo i Geoinżynieria; 2007, 31, 2; 617-626
1732-6702
Pojawia się w:: Górnictwo i Geoinżynieria
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: TDR technique for estimating the intensity of effective non rainfall
Autorzy:: Janik, G
Skierucha, W.
Blas, M.
Sobik, M.
Albert, M.
Dubicki, M.
Zawada, A.
Powiązania:: https://bibliotekanauki.pl/articles/26139.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: time domain reflectometry technique
time-domain reflectometer zob.TDR technique
intensity
non-rainfall water flux
water infiltration
soil
Opis:: The objective of this paper is to present a method for determining diurnal distribution of the intensity of effective non rainfall water flux. It was found that the application of TDR technique for the determination of diurnal dynamics of effective non rainfall water flux requires temperature correction of sensed volumetric moisture contents. Without temperature correction the error of estimated non rainfall water flux can be as much as 26%. In addition, the effect of temperature changes on the soil surface was determined in 0.5, 1, 2, 3, 4, and 5 hours periods. It was found that the intensity of effective non rainfall water flux was determined to the greatest extent by the rate of temperature drop during the period of 3 h preceding the non rainfall water flux determination. The agreement of non rainfall water flux calculated with the method proposed and that obtained by the collector was better for dew than for hoarfrost periods.
Źródło:: International Agrophysics; 2014, 28, 1
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Distributions and Fluxes of Nitrogen and Phosphorus Nutrients in Porewater Sediments in the Estuary of Jepara Indonesia
Autorzy:: Maslukah, Lilik
Wulandari, Sri Yulina
Prasetyawan, Indra Budi
Zainuri, Muhammad
Powiązania:: https://bibliotekanauki.pl/articles/123892.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: pore water
sediment flux
nitrogen nutrient
phosphorus nutrient
Jepara
Opis:: River is a location that is responsible for the main transport of nutrient flow from land to estuary and oceans. The nutrients that are adsorbed by the solid phase can be deposited and stored in the sediment. Sediments in estuaries and beaches have an important role in storing or removing nutrients from or to the water column. The presence of nutrients in porewater interacts with sediment and water column. In general, the nutrients that have a role as limiting factors for life in the waters are nitrogen (N) and phosphorus (P). The release of N and P elements is very important for the estuary and coastal environment, related to the process of regenerating nutrients into the water column. The release mechanism is determined by a diffusion process, based on the difference of concentration between the water column and the porewater. This study aims to determine the concentration of N and P in the porewater and estimate the value of flux. The sediment samples were taken from the Wiso and Serang estuary, Jepara. The components that were analyzed in the porewater are the concentration of N (nitrate, nitrite) and P (phosphate). Nitrite, nitrate and phosphate were determined by using sulphanilamide method and the molybdenum blue method, respectively. Furthermore, the flux value (F) was calculated based on the Fick’s I Law which was corrected by porosity. The results show that the mean concentrations of nitrate (NO₃^-), nitrite (NO₂^-) and phosphate (PO₄^2-) in the sediment water of Serang Estuary are 1.96, 1.41, 3.46 μM and in the Wiso estuary are 3.4, 1.85, 8.22 μM. In general, based on the calculation of flux, the sediments in the Serang and Wiso estuaries have a positive flux. Moreover, the sediment in Jepara acts as a source and releases N and P nutrient into the water column. The Wiso estuary has a higher flux than the Serang estuary.
Źródło:: Journal of Ecological Engineering; 2019, 20, 2; 58-64
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Simultaneous measurement of oxygen flux and salinity of the water saturated mineral soils
Autorzy:: Bieganowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/24164.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: mineral soil
simultaneous measurement
electrical conductivity
saturated soil
oxygen flux
soil oxygen
soil salinity
water
salinity
flux density
Źródło:: International Agrophysics; 2003, 17, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Determination of the integration range in voltammetric measurements of oxygen flux in the soil with the use of two- and three-electrode systems
Autorzy:: Bieganowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/26100.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: determination
soil aeration
soil
oxygen flux
oxygen condition
voltammetry
water content
Źródło:: International Agrophysics; 2004, 18, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Effektivnost' infrakrasnykh vodjanykh otopitel'nykh panelejj
Water efficiency infrared heating panels
Autorzy:: Cherednik, A.
Redko, A.
Powiązania:: https://bibliotekanauki.pl/articles/76786.pdf
Data publikacji:: 2014
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:: water management
radiant heating
flux density
air temperature
heat flow
experimental study
Źródło:: Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 6
1730-8658
Pojawia się w:: Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: On the nonlinear internal waves propagating in an inhomogeneous shallow sea
Autorzy:: Massel, S.R.
Powiązania:: https://bibliotekanauki.pl/articles/48527.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: nonlinear wave
internal wave
energy flux
wave propagation
shallow water
wave breaking
Źródło:: Oceanologia; 2016, 58, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Seasonal variations in the abundance and sinking flux of biogenic silica in Daya Bay, Northern South China Sea
Autorzy:: Zhao, X.
Yang, W.
Ma, H.
Li, J.
Chen, M.
Fang, Z.
Zhang, X.
Zeng, J.
Qiu, Y.
Zheng, M.
Powiązania:: https://bibliotekanauki.pl/articles/48777.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: biogenic silica
flux
thorium
seasonal variation
shallow water
Daya Bay
China Sea
Źródło:: Oceanologia; 2019, 61, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Identification of the average and local boundary condition of heat transfer during cooling with a water spray under surface boiling
Autorzy:: Jasiewicz, Elżbieta
Hadała, Beata
Malinowski, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/29520235.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: water spray cooling
heat transfer coefficient
heat flux
inverse problem
heat conduction equation
Opis:: The study determined the local and average heat transfer coefficient and the heat flux on the surface of a cylinder cooled with a water nozzle. The inverse method was used to identify the heat transfer coefficient. An objective function was defined to determine the distance between the measured and calculated temperatures. Two models describing the heat transfer coefficient on the cooled surface were considered. The first model described changes in the heat transfer coefficient as a function of the sample radius and cooling time, and the second one assumed the dependence of the heat transfer coefficient solely on time. Numerical simulations showed significant differences in the determined heat transfer coefficients depending on the adopted model of the boundary condition. The performed tests included experimental temperature measurements at selected points of the sensor, numerical simulations of temperature changes, and the inverse solution.
Źródło:: Computer Methods in Materials Science; 2020, 20, 4; 147-155
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Winter upwelling in the Gulf of Finland, Baltic Sea
Autorzy:: Suursaar, U.
Powiązania:: https://bibliotekanauki.pl/articles/2078916.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: upwelling
winter
nearshore region
Finland Gulf
Baltic Sea
stratification
vertical flux
water temperature
Opis:: Traditionally, upwelling-related studies in the Baltic Sea have been limited to the period from May to September. Based on wintertime in situ measurements at two nearshore locations in the Gulf of Finland, clear evidence of winter “warm” upwelling events was detected and analysed. The process was very common. At a 10 m deep location, upwelling caused water temperature (T) to switch from 0—1 to 4—5°C and salinity (S) to switch from 4.5 to 6 PSU; at 20 m depth it caused a switch in T between 1 and 2—4°C and in S between 5.5 and 6.8 PSU. Differently from summer upwelling, T and S variations were positively correlated to each other. Salinity variations remained roughly the same throughout the winter, whereas T differences were higher in winter onset, then decreased to ca. 1°C, and increased again after the process reversed to summer-type upwelling in April—May. Based on analysis of SatBaltyk (January to March) sea surface temperature and salinity product imagery, winter upwelling occurrence along the North Estonian coast was 21—28% over 2010—2021, and slightly less along the Finnish coast. Regarding S variations, winter upwelling occurred with roughly similar frequencies and impacts in the northern and southern parts of the gulf. However, the impacts on T and sea ice conditions were highly asymmetrical. Upwelling kept the Estonian coast ice-free longer and water temperatures slightly higher than at the Finnish coast. Winter upwelling as a phenomenon has long been ignored and therefore probably underestimated.
Źródło:: Oceanologia; 2021, 63, 3; 359-369
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki