Results 251 to 260 of about 360,193 (299)

Downstream migration of radio-tagged silver eels

, 2004
No abstracts are to be cited without prior reference to the author.The catadromous eel leave the feeding grounds in fresh water during late autumn to migrate to the spawning grounds in the Sargasso Sea. During the last decades the European eel population Anguilla anguilla (L.) has decreased to a historic low population level (Dekker 2004).
Pedersen, Michael I., Jepsen, Niels
openaire   +2 more sources

Flow design of guiding device for downstream fish migration

River Research and Applications, 2010
AbstractDownstream migrating smolt must be guided around hydropower plants to avoid fish mortality due to the turbines. In Piteå River, which is already regulated, open spillways serve this purpose but few fish find this route. Hence, action must be taken to enhance downstream fish migration.
Lundstrom, T S, Hellstrom, J GI, Lindmark, E M   +2 more
openaire   +2 more sources

Multiscale comparison of eel downstream migration and water discharge

, 2005
As a migratory fish, the eel is particularly threatened by obstacles on waterways. One of the ways to mitigate entrainment of downstream migrants into the turbines of hydroelectric facilities, would be to predict the runs and behavior of eels according to environmental parameters. Here we investigate the link between migration peaks and river discharge
Durif, Caroline, Travade, F., Elie, Pierre, Gosset, Claude   +3 more
core   +4 more sources

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Fishways for Downstream Migration

2019
In order to ensure the downstream migration of fish, it is not enough to prevent them from entering the potentially hazardous parts of facilities; they must also be provided with an alternative path that will enable them to travel, actively or passively, from the headwater of a barrage to the tailwater without loss of time or risk of injury.
Ulrich Schwevers, Beate Adam
openaire   +1 more source

Reservoir effects on downstream river channel migration

Environmental Conservation, 2000
Human occupation and development of alluvial river floodplains are adversely affected by river channel lateral migration, which may range as high as several hundred metres per year. Reservoirs that reduce the frequency and duration of high flows typically reduce lateral migration rates by factors of 3 to 6.
F. DOUGLAS SHIELDS JR, ANDREW SIMON, LYLE J. STEFFEN   +2 more
openaire   +1 more source

Direct and indirect impacts of pumping station operation on downstream migration of critically endangered European eel

Fisheries Management and Ecology, 2019
© 2018 John Wiley & Sons Ltd Downstream passage of European eel Anguilla anguilla (L.) in catchments with pump(s) for water level management is a major concern.
Jonathan D Bolland, Ian G Cowx
exaly   +2 more sources

Retinal Responses of Pink Salmon associated with its Downstream Migration

Nature, 1959
THE seaward migration of juvenile Pacific salmon is usually nocturnal and confined to a relatively brief portion of the night1. It has been suggested that “as the light intensity falls rheotactic responses, which are to a large degree dependent on vision, fail, and these fish pass down stream in shoals.
M A, ALI, W S, HOAR
openaire   +2 more sources

Hot Streak and Vane Coolant Migration in a Downstream Rotor

Volume 6: Turbomachinery, Parts A, B, and C, 2008
This paper describes a method of improving the cooling of the hub region of high-pressure turbine (HPT) rotor by making better use of the unsteady coolant flows originating from the upstream vane. The study was performed computationally on an engine HPT stage with representative inlet hot streak and vane coolant conditions.
Jonathan Ong, Robert J. Miller
openaire   +1 more source

Downstream-migrating fluvial point bars in the rock record

Sedimentary Geology, 2016
Abstract Classical models developed for ancient fluvial point bars are based on the assumption that meander bends invariably increase their radius as meander-bend apices migrate in a direction transverse to the channel-belt axis (i.e., meander bend expansion).
GHINASSI, MASSIMILIANO, Ielpi, Alessandro, Aldinucci, Mauro, Fustic, Milovan   +3 more
openaire   +1 more source

The random downstream migration of molecules in chromatography

Journal of Chemical Education, 1958
This articles outlines a theory of chromatography based on the classic random-walk problem that involves more physical intuition and less difficult mathematics than current theories.
openaire   +1 more source