Sentence examples for upstream migration from inspiring English sources

Within two decades a higher dam was built at Greeneville, and by 1866 Ponemah mill was under construction, providing another obstacle to upstream migration.

They are abundant in the rivers leading to the Black and Caspian seas and to the Sea of Azov during the two weeks of the upstream migration.

This study deals with hydraulic characteristics for different weir types and effects on upstream migration of fish in a pool-weir fishway, and presents an optimal design of weir for an easy upstream migration.

Upstream migration of the waveform results from differential deposition between the upstream and downstream sides of the mounds.

Electrical output was recently increased in an effort to more effectively eliminate the upstream migration of bighead carp (Hypophthalmichthys nobilis) and silver carp (Hypophthalmichthys molitrix).

In low lying coastal areas the threat of coastal squeeze for many important grazing marshes will require a strategic approach to allow upstream migration of important biodiversity.

However, overgrazing may not have caused the incision of this period, but instead exacerbated or accelerated the upstream migration of knickpoints formed earlier along middle reaches.

This preferential deposition is considered to result in possible upstream migration of the topography, a common feature of deep-sea sediment waves, provided that such deposition were repeated.

These results indicate that neither antidunes nor lee-waves are necessary for the formation and upstream migration of the wavy structure.

The preferential deposition occurred under a subcritical turbidity current, implying that antidune flow conditions (0.844upstream migration of the bedforms.

Upstream migration of fish through circular culverts is often prevented by velocities in the barrel being higher than that of the natural channel.