Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: residence time

Sortuj według:

Ogranicz wyniki do:

Influence of vegetation on the hydraulic behaviour of a reconstructed wetland

100%

Dal Cin L., Bendoricchio G.

International Journal of Ecohydrology and Hydrobiology

2002

tom 02

nr 1-4

The ecohydrological approach can be applied to reconstructed wetlands where an appropriate vegetation design is needed in order to optimise hydraulic behaviour, water quality improvement and biodiversity increase. The purpose of this study is to examine the hydraulic effects of different development stages of vegetation in a demonstrative reconstructed wetland in Italy characterised by a central canal and two vegetated lateral shallow zones. Tracer tests were carried out in different vegetation conditions. The residence time distributions were analysed using several parameters. As expected, the results show that with more developed vegetation the hydraulic dead zones increase. On the other hand, a moderate increase of vegetation density doesn’t hinder the flow, but rather increases dispersion number. A proper design has to avoid hydraulic short circuiting and provide a good distribution of the flow especially in the vegetated zones.

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Unusual Baltic inflow activity in 2002-2003 and varying deep-water properties

84%

Feistel R., Nausch G., Hagen E.

Oceanologia

2006

tom 48

nr S

The unusual sequence of inflow events into the Baltic Sea that occurred in 2002 and 2003 includes the first ever important baroclinic inflow to be described (August 2002), the Major Baltic Inflow (January 2003), which gave rise to the highest oxygen levels in the Gotland Deep since the 1930s, and the baroclinic inflow (August 2003) that elevated the Gotland Basin deep water salinity to values last observed in 1977, and caused the surface salinity to rise again. From these trend changes, salt residence times were estimated at about 20 years in the deep waters and 30 years above the pycnocline. Ventilation of the remote Karlsö Deep took until 2005, two years after the inflow event responsible, at a time when the Bornholm and Eastern Gotland Basins were already returning to stagnation.

Ograniczanie wyników

1 International Journal of Ecohydrology and Hydrobiology

1 Oceanologia

1 Bendoricchio G.

1 Dal Cin L.

1 Feistel R.

1 Hagen E.

1 Nausch G.

1 2006

1 2002

Wyniki wyszukiwania

Influence of vegetation on the hydraulic behaviour of a reconstructed wetland

Unusual Baltic inflow activity in 2002-2003 and varying deep-water properties