The influence of a proposed pumped storage hydro-power plant on the thermal stratification of lake Ivö, Sweden
(1979) UN Economic Commission for Europe (ECE) Symposium on the prospects of hydroelectric schemes under the new energy situation and on related problems- Abstract
- Model tests have shown that by building a shallow dam at the outlet the discharge from the upper reservoir can be distributed over such a large width that the kinetic energy is dissipated before the flow reaches levels deeper than 10 m. Since the summer thermocline is situated at 15 m and the epilimnion is homothermal the discharge does not affect the thermal stratification of the lake during the summer. For the same reason the breakdown of the thermocline in the autumn is not affected. In the early summer a thermocline is developed at about 8 m, but in about a week the thermocline level is lowered below 10 m. The discharge affects the thermal structure of the upper 10 m, but since the water soon becomes homogenous down to and below this... (More)
- Model tests have shown that by building a shallow dam at the outlet the discharge from the upper reservoir can be distributed over such a large width that the kinetic energy is dissipated before the flow reaches levels deeper than 10 m. Since the summer thermocline is situated at 15 m and the epilimnion is homothermal the discharge does not affect the thermal stratification of the lake during the summer. For the same reason the breakdown of the thermocline in the autumn is not affected. In the early summer a thermocline is developed at about 8 m, but in about a week the thermocline level is lowered below 10 m. The discharge affects the thermal structure of the upper 10 m, but since the water soon becomes homogenous down to and below this level, the effect is very small and hypolimnion temperature is not affected. However, the effect of increased turbidity on the absorption of short wave radiation has not been taken into account. In the early winter, the surface water of the lake will cool slightly faster than if no pumpage took place, but an equilibrium condition will soon be obtained. Temperature profiles observed in Lake Ivoe are shown and one can see that a thermocline usually exists at a depth of about 15 m and that the water of the epilimnion as well as the water of the hypolimnion is well mixed. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/860b2808-a210-44d1-910a-946390d22bfb
- author
- Bengtsson, Lars LU
- alternative title
- Inverkan av föreslaget pumpkraftverk på den termiska stratifieringen i Ivösjön : TULEA 1979:2
- publishing date
- 1979
- type
- Contribution to conference
- publication status
- published
- subject
- keywords
- Water Engineering, Vattenteknik
- pages
- 12 pages
- conference name
- UN Economic Commission for Europe (ECE) Symposium on the prospects of hydroelectric schemes under the new energy situation and on related problems
- conference location
- Aten, Greece
- conference dates
- 1979-10-10 - 1979-10-16
- language
- English
- LU publication?
- no
- id
- 860b2808-a210-44d1-910a-946390d22bfb
- date added to LUP
- 2023-10-02 17:50:53
- date last changed
- 2023-10-17 14:33:00
@misc{860b2808-a210-44d1-910a-946390d22bfb,
abstract = {{Model tests have shown that by building a shallow dam at the outlet the discharge from the upper reservoir can be distributed over such a large width that the kinetic energy is dissipated before the flow reaches levels deeper than 10 m. Since the summer thermocline is situated at 15 m and the epilimnion is homothermal the discharge does not affect the thermal stratification of the lake during the summer. For the same reason the breakdown of the thermocline in the autumn is not affected. In the early summer a thermocline is developed at about 8 m, but in about a week the thermocline level is lowered below 10 m. The discharge affects the thermal structure of the upper 10 m, but since the water soon becomes homogenous down to and below this level, the effect is very small and hypolimnion temperature is not affected. However, the effect of increased turbidity on the absorption of short wave radiation has not been taken into account. In the early winter, the surface water of the lake will cool slightly faster than if no pumpage took place, but an equilibrium condition will soon be obtained. Temperature profiles observed in Lake Ivoe are shown and one can see that a thermocline usually exists at a depth of about 15 m and that the water of the epilimnion as well as the water of the hypolimnion is well mixed.}},
author = {{Bengtsson, Lars}},
keywords = {{Water Engineering; Vattenteknik}},
language = {{eng}},
title = {{The influence of a proposed pumped storage hydro-power plant on the thermal stratification of lake Ivö, Sweden}},
year = {{1979}},
}