- Tytuł:
-
Zmiany uziarnienia na dnie poniżej budowli piętrzącej
Changes of bed grain size distribution below hydraulic structure - Autorzy:
-
Zawadzki, P.
Hammerling, M. - Powiązania:
- https://bibliotekanauki.pl/articles/886616.pdf
- Data publikacji:
- 2008
- Wydawca:
- Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
- Tematy:
-
budowle pietrzace
dno rzeczne
glebokosc rozmycia
modele matematyczne
odskok hydrauliczny
rozmycia
uziarnienie
zmiany uziarnienia - Opis:
- The paper presents results of laboratory investigations of local scour in non-uniform non-cohesive bed material below a horizontal solid apron. An experiment of local scouring conducted in a glass-sided rectangular fl ume under clear- water conditions with constant water discharge was performed. In this study several non-uniform soils consisted of the following coloured fractions: 0.5–1.25, 1.25–2.5, 2.5– –4.0, 4.0–6.3, and 6.3–10.0 mm were used. Every scour hole had begun just below the solid apron having mild slope and downward concave shape. Similar changes in grain composition were observed in all tests; the hole bottom at the deepest section was covered by the largest grains. During the experiments it was found that bed armour coat had formed in soils with standard deviation of mean grain size σg > 2 and downstream of the maximum scour hole depth, only. Soils with σg < 2 did not create any armour coat, and single coarse grains increased turbulence behind them and accelerated erosion of fi ner grains.
- Źródło:
-
Scientific Review Engineering and Environmental Sciences; 2008, 17, 2[40]
1732-9353 - Pojawia się w:
- Scientific Review Engineering and Environmental Sciences
- Dostawca treści:
- Biblioteka Nauki
Artykuł