Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: zmiany uziarnienia

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Przekształcenia osadu stokowego w świetle zmian uziarnienia i stopnia obtoczenia ziarn kwarcowych

100%

Korotaj M.

Prace i Studia Geograficzne

1988

tom 09

Basing on two profiles an analysis of hill-side material was carried out. The shift of the deposit along the hill-side was stated on the grounds of changes in granulation and in the degree of abrasion of quartz grains of the sandy fraction. Changes occurring in the degree of sorting and abrasion of the material are connected with the washing process and with the type of the section of the hill-side where the process occurs. The degree of material sorting rises from the bottom of the diggings toward their roof. That means that the source formation is worse sorted than the covering in which the washing process occurs. In the part of the hill-side where accumulation prevails the grains are better rounded and can be displaced more easily. Instead, on the denudation side there occur worse rounded grains in a better sorted material.

Zmiany uziarnienia na dnie poniżej budowli piętrzącej

63%

Zawadzki P., Hammerling M.

Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

2008

tom 17

nr 2[40]

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.

Ograniczanie wyników

1 Prace i Studia Geograficzne

1 Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

1 Hammerling M.

1 Korotaj M.

1 Zawadzki P.

1 2008

1 1988

Wyniki wyszukiwania

Przekształcenia osadu stokowego w świetle zmian uziarnienia i stopnia obtoczenia ziarn kwarcowych

Zmiany uziarnienia na dnie poniżej budowli piętrzącej