Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Patent
1994-08-04
1995-07-18
Reese, Randolph A.
Hydraulic and earth engineering
Fluid control, treatment, or containment
Flow control
119219, E02B 808
Patent
active
054335540
ABSTRACT:
The gradient salt concentration fishway is installed on or near the river bank, at points contiguous to existing flood control dams and weirs. Fresh water flows naturally downstream via the fish way. Salt water is pumped from the sea into several points in the fish way in order to mix with the fresh water of the river. By controlling the amount of salt water introduced at each stage of the fishway, the concentration of salt within the entire fishway can be made gradient. Hence, the concentration of salt nearest the ocean is the greatest while it decreases the closer it gets to the fresh water. Above the dam, the fresh water is not mixed with salt water. This system will more accurately approximate the natural conditions encountered by fish entering a brackish environment, thus easing the biological adjustments which migrating fish need.
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"Physiology of Fish Recurrent Migration" by Dr. Ueda, contained in Biology of Migrating Fish, edited by Drs. Morisawa, Aida and Hirano, Gakkai Press Center Co., Ltd., 1987, pp. 172-180.
Minakami Hiroyuki
Minakami Motoyuki
Lagman Frederick L.
Reese Randolph A.
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