Temat: water flow - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A bypass flow model with a procedure to approximate precipitation intensity
Autorzy:: Walczak, R T
Slawinski, C.
Tematy:: bypass flow model
preferential water flow
precipitation
intensity
water flow
distribution; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1401856.pdf Link otwiera się w nowym oknie
Opis:: Precipitation and intensity of precipitation are the most important parameters of soil profile water balance. Precipitation values give the information about amount of water reaching the soil surface. Intensity of the precipitation determines the amount of water accumulated in a soil profile and the amount of runoff water. The aim of the paper was to show the importance of consideration of precipitation distribution approximation in water dynamics modelling in soil profile taking into account preferential water flow.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: The calculation long-term physical field created by water flow around the ship
Autorzy:: Bielański, J.
Tematy:: water flow around the ship
hydrodynamics; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/331900.pdf Link otwiera się w nowym oknie
Opis:: The paper presents a description of the problems with fluid flow around a ship. Using the described solution of the problem were performed numerical calculations using the boundary element method. Were also presented preliminary results of the calculation of pressure fields at the bottom of the ship, taking into account the impact of the bottom.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Indicators of Variability of Water Flow Rate in the Piwonia River
Autorzy:: Grzywna, Antoni
Tematy:: Piwonia River
water flow
indicators
variation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/124217.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the variability of the Piwonia River flows in the Parczew profile (catchment area of 391 km²) in hydrological years 2009/10–2015/16. On the basis of the monthly flow and daily water level measurements, flow-level curves and hydrograms of water flows were drawn. The analysis of the weather conditions in the catchment area showed that in the analyzed period there were two very wet years (2010, 2014), three wet years (2011, 2013, 2016), one normal year (2012) and one dry year (2015). The total of annual precipitation in very wet years was 150 mm (130% of the norm) higher than the average for multi-years, and in the dry year it was 60 mm (86% of the norm) lower. The intensity of instantaneous flows ranged from 0.26 m³∙s^-1 in 2015 to 5.5 m³∙s^-1 in 2010. The average annual flow of the river in multi-years was SSQ = 1.68 m³∙s^-1 and ranged from 1.19 m³∙s^-1 in 2015 (dry in terms of precipitation) to 2.13 m³∙s^-1 in 2010 (very wet). The direct reasons for the variability of river flows are: weather conditions, retention capacity of lakes and fish ponds, and exploitation of the hydrotechnical structures. The hydrological year 2014/15 was characterized by the highest variability of flows, while the lowest variability was recorded in the hydrological year 2010/11.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Influence of geotechnical conditions on damage states of Gdansk Bay Coast cliff formations
Autorzy:: Mieloszyk, E.
Wyroślak, M.
Tematy:: coastal cliff
escarpment stability
underground water flow; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258882.pdf Link otwiera się w nowym oknie
Opis:: A geotechnical aspect of destruction processes of seashores was identified based on the case of erosion of Gdansk Bay Coast cliff formations. Causative factors of landslide were described in the context of natural phenomena, land development and its anthropogenic transformations. Possible directions of theoretical analysis of changes in groundwater relations were indicated.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: The processing of elements by mires in agricultural landscape: mass balances based on sub-surface hydrology
Processing of elements by mires in agricultural landscape
Autorzy:: Kruk, Marek
Współwytwórcy:: Polska Akademia Nauk. Instytut Ekologii
Wydawca:: Polish Scientific Publishers
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Ekologia Polska
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Opis:: Streszczenie w języku polskim
Strony 73-117 : ilustracje ; 24 cm
Bibliographical references (pages 113-117)
Bibliografia na stronach 113-117
Pages 73-117 : illustrations ; 24 cm
Abstract in Polish
Small mires located in hollows with no surface outflows were subject to biogeochemical studies by input-output balance method based on measurements of groundwater flows. Estimates were made of water balance as well as balance of dissolved forms of: N (including N – NO3, N – NH4, Norg), K, Na, Ca, Mg, S – SO4 and Cl. The following undrained mires were examined: two with minerotrophic fen and one with ombrotrophic-transition bog. Also a drained minerotrophic mire was studied. It was observed that nitrogen outflow from undrained mires was considerably smaller. The mire with ombrotrophic-transition bog could retain a substantial part of a scanty inflow of the examined elements, while mires with minerotrophic fen – upmost a tiny part of a rich inflow mainly from catchment basin. Drained minerotrophic mire was no longer apt to retain a majority of elements, nitrogen in particular.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

Książka

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Skocz do pozycji: 6.

Tytuł:: Evaluation of some water extraction models in predicting water uptake of pigeonpea
Autorzy:: Ogunremi, L.T.
Tematy:: water uptake
soil
genotype
pigeon-pea
water flow
water extraction; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/25561.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Addressing Water Scarcity in Samdrupjongkhar Thromde, Bhutan : feasibility Study and Design of a Sustainable Gravity Water Supply System
Autorzy:: Tamang, Phurba
Tenzin, Rigden Yoezer
Tshering, Dawa
Sharma, Vasker
Tematy:: water supply
gravity water flow
EPANET analysis
water pipe system design; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/31340454.pdf Link otwiera się w nowym oknie
Opis:: The provision of a reliable water-supply system is essential for the development and well-being of urban communities. Samdrupjongkhar Thromde, located in Bhutan, has been facing water supply challenges despite the presence of a water treatment plant. The non-perennial nature of the current water source coupled with malfunctions in water pumps has led to acute water shortages in the municipality. To address this issue, this study carried out a feasibility investigation and designed a gravity water supply system by conducting an EPANET (Environment Protection Agency Network Evaluation Tool) analysis. The study involved field visits to identify potential water sources, and a topographic survey using RTK (Real Time Kinematics) technology to determine the optimal pipeline route. The EPANET analysis was then conducted to evaluate the hydraulic performance of the initial route. Based on these findings, a final water pipeline route was selected considering factors such as terrain characteristics, construction feasibility, avoidance of negative water pressure, and minimum encroachment of private land. The results showed that the maximum pressure head within the pipeline system reached 296 m with a maximum water flow velocity of 5 m/s. However, at the outlet, the pressure head decreased to 70 m and the velocity decreased to 2 m/s. Two Break Pressure Tanks (BPT) were strategically placed to achieve this pressure reduction. The chosen pipe materials and their placement ensure the long-term reliability and functionality of the water supply system, while considering maintenance convenience and terrain characteristics.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 8.

Tytuł:: Formation of a Favorable Filtration Regime of Soils in Saline Areas of the Danube Delta Rice Irrigation Systems
Autorzy:: Turcheniuk, Vasil
Rokochinskiy, Anatoliy
Kuzmych, Lyudmyla
Volk, Pavlo
Prykhodko, Nataliia
Tematy:: water supply
gravity water flow
EPANET analysis
water pipe system design; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/31340455.pdf Link otwiera się w nowym oknie
Opis:: The environmental state of rice irrigation systems (RIS) is determined by many factors, including natural ones (soil, topographical, hydrogeological, and climatic factors) and technological ones (irrigation norm, design, and parameters of irrigation and drainage networks, etc). The most significant influence on the ecological reclamation state of the RIS carries is effected by its drainage network (DN). The need to maintain a flushing water regime with specific filtration rates to prevent secondary salinization in the Danube Delta’s rice systems is a crucial aspect of managing these agricultural areas. In the saline areas of rice systems located in the Danube Delta, the DN must ensure the maintenance of the flushing water regime with the rates of filtration ranging between 10 to 12 mm/day. This is a prerequisite for preventing secondary salinization of irrigated lands of these rice systems. According to the results of studies, the filtration from the surface of the irrigation checks of the Danube Delta RIS has been established, and its values in the area of the rice check vary significantly. Different intensity of filtration in the area of rice checks causes the difference in mineralization of groundwater and in the content of salts in the soil. This leads to the fact that the same rice check created various natural reclamation conditions and different productivity of cultivated crops.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Simulation of density dependent transport in groundwater
Autorzy:: Maciejewski, S.
Zaradny, H.
Tematy:: water flow
chemical substances
transport
mathematical model
groundwater; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/241486.pdf Link otwiera się w nowym oknie
Opis:: A mathematical model of water flow and transport of chemical substances is presented in the paper. This model takes into account the influence of variable density and viscosity of water caused by variable solute concentration in soil. A solution of the problem of water flow and solute transport was sought using numerical methods. A finite elements method for solution of water flow equation and Monte-Carlo method to simulate solute transport were applied. Advantages of the presented model are illustrated on the example of water flow and salt transport in two dimensional ground profile in the region of Puck Bay. The geology of this profile is taken from Jankowska et al (1994). Obtained results from the proposed model are qualitatively conformable with observations in situ.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Stable isotope deuterium as a natural tracer of mixing processes in rivers
Autorzy:: Palige, J.
Ptaszek, S.
Zimnicki, R.
Chmielewski, A. G.
Wierzchnicki, R.
Tematy:: stable isotopes
tracer
deuterium
oxygen-18
river
water flow; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146756.pdf Link otwiera się w nowym oknie
Opis:: The possibility of application of naturally existing differences in isotope contents 18O/16O, 2H/1H in waters for investigation of transport and mixing of various waters in the tributary-river system is presented. Experiments carried out on the Bug-Narew rivers-Zegrze Lake and the BugoNarew-Vistula rivers systems have indicated that the hydrogen isotope ratio 2H/1H can be used as an intrinsic tracer of natural mixing processes occurring in rivers. The IRMS methodology was used for isotope ratio measurement of water samples. The degrees of water mixing as a function of distance from the confluence point of rivers were determined. The obtained results indicate that in water systems where the natural differences in ?2H are higher than 5‰ this technique can replace the time-consuming and expensive dye (or radiotracer) dispersion tests for evaluation of pollutant transport in rivers.
Dostawca treści:: Biblioteka Nauki

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