Results 261 to 270 of about 596,534 (308)

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

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

Less anxious salmon smolt become easy prey during downstream migration

Science of The Total Environment, 2019
Hatchery-reared salmon smolt used for supplementary stocking often display poor migration behavior compared to wild smolt, which reduces the success of this management action. Oxazepam, an anxiolytic drug, has been shown to intensify salmon smolt migration in mesocosm experiments, and treatment with this drug has, therefore, been suggested as a ...
Jonatan Klaminder, Micael Jonsson, Johan Leander, Johan Fahlman, Tomas Brodin, Jerker Fick, Gustav Hellström   +6 more
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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   +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
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Downstream fish migration from two regulated lakes monitored by hydroacoustics

Fisheries Management and Ecology, 1998
The migration of fish from two large northern Finnish lakes to their outflowing rivers was studied by echosounding and exploratory fishing. Both lakes are regulated for hydroelectric purposes. In both rivers, two sonar stations with stationary up‐ and down‐looking transducers were used to collect data for one year.
null VEHANEN, null HYVÄRINEN, null MÄKI‐PETÄYS   +2 more
openaire   +1 more source

Downstream migration of radio-tagged silver eels

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
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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 Migration of Silver-Phase Anguillid Eels

2003
Downstream migration of adult anguillid eels in freshwater habitats marks the end of a long, generally slow growth phase, abandonment of a home range, and initiation of a seaward spawning migration. Although different species of Anguilla exhibit variation in characteristics of this migratory phase, some generalized traits in migration are common to ...
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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