אסיף מאגר המחקר החקלאי

Limnology of dual purpose reservoirs in the coastal area and Jordan valley of Israel

Year:

1994

Source of publication :

Authors :

Volume :

46

Co-Authors:

Zoran, M.
Milstein, A.
Krambeck, H.J.
Zoran, M., Fish Cult.Res.Stn, Dor, Israel
Milstein, A., Fish Cult.Res.Stn, Dor, Israel
Krambeck, H.J., Fish Cult.Res.Stn, Dor, Israel

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Abstract:

Shallow reservoirs (about 3-4 m deep) developed a daily pattern of thermal and oxygen stratification with full nocturnal mixing. Deep reservoirs (5-8 m deep) developed, in addition to the daily pattern at the upper layers (2-3 m), a seasonal stratification. This led to the formation of an anoxic hypolimnion which lasted until midseason when the water level decreased to about 5 m due to irrigation. The daily wind (west sea breeze) induced movement of the upper oxygenated layer eastward. This layer downwelled in the east of the reservoir and the subsurface layer upwelled in the west, leading to a horizontal oxygen gradient in which the dissolved oxygen concentration in the east was higher and reached a greater depth than in the west. Differences in weather between the geographic locations led to stronger stratification in the Jordan Valley. -from Authors

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