Autor: Hachaj, P.S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact of a Thermocline on Water Dynamics in Reservoirs – Dobczyce Reservoir Case
Autorzy:: Hachaj, P. S.
Szlapa, M.
Powiązania:: https://bibliotekanauki.pl/articles/140137.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: storage reservoir
water dynamics
numerical simulation
thermocline
stratification
zbiornik retencyjny
dynamika wody
symulacja numeryczna
termoklina
uwarstwienie
Opis:: While modeling water dynamics in dam reservoirs, it is usually assumed that the flow involves the whole water body. It is true for shallow reservoirs (up to several meters of depth) but may be false for deeper ones. The possible presence of a thermocline creates an inactive bottom layer that does not move, causing all the discharge to be carried by the upper strata. This study compares the results of hydrodydynamic simulations performed for the whole reservoir to the ones carried out for the upper strata only. The validity of a non-stratified flow approximation is then discussed.
Źródło:: Archive of Mechanical Engineering; 2017, LXIV, 2; 189-203
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Flow patterns for drying and wetting of a retention reservoir bed - numerical modeling
Autorzy:: Hachaj, P.S.
Tutro, M.
Powiązania:: https://bibliotekanauki.pl/articles/61026.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: flow pattern
drying
wetting
retention reservoir
water quality
water dynamics
numerical simulation
numerical modelling
Opis:: This paper deals with one of the aspects important from the point of view of water quality maintenance in storage reservoirs, namely the dynamics of water currents that accompany changes of the water surface elevation in such reservoirs. Numerical simulations were conducted to back observations that high discharges are in the long term beneficial to water quality in the reservoir. Calculations made using the AdH finite elements model confirmed that the water current pattern in shallow regions varies greatly with the total discharge value. The sample analysis shown in this article concerns a mid-size storage reservoir of Tresna located in southern Poland. It appears that for small discharges the currents that wet some areas of the previously dry reservoir bed are similar to reversed currents that occur when the area is dried. Thus some amounts of water may move from one stagnant area to another forth and back and then the water exchange is limited. It means that it is not enough to lower the water level within the reservoir steering rules and then raise it again to be assured that the water quality improves in the reservoir, especially in the lull parts. But for higher discharges the current pattern is different and the exchange of the reservoir water really does happen. In most cases in order to “flush” a reservoir that way one could just wait for high water to come, but if reservoirs form a cascade creating an artificial controlled freshet that propagates down the cascade may be a considerable means of altering water quality in lower reservoirs.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2014, IV/3
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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