Design and testing of two ice-preserving winter lake aeration systems

Christopher R. Ellis, Heinz G. Stefan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

As part of an effort to achieve ice-preserving lake aeration for winterkill prevention, two non-mixing lake aeration systems were designed and field tested. Each creates a fish refuge by oxygenating a layer of the lake while preserving water temperature stratification and ice cover such that no open water is generated. Both systems withdraw near-anoxic water from one part of a lake and discharge the water after on-shore aeration to another part of the lake. Both employ cascade aerators having design discharge and dissolved oxygen input rates of roughly 60 l/s and 40 kg/day, respectively. Aerated water is discharged near mid-depth with minimal disturbance of the ambient water through specially designed manifold/diffusers. The diffuser in one case is linear and 15 m long while the other is axisymmetric and 2 m in diameter. The manifold/diffuser designs were developed by extensive laboratory experimentation followed by prototype manufacture and field testing. The aerators are currently in use in Minnesota lakes.

Original languageEnglish (US)
Title of host publicationProceedings - National Conference on Hydraulic Engineering
PublisherPubl by ASCE
Pages1326-1330
Number of pages5
Editionpt 2
ISBN (Print)0784400377
StatePublished - Dec 1 1994
EventProceedings of the 1994 ASCE National Conference on Hydraulic Engineering - Buffalo, NY, USA
Duration: Aug 1 1994Aug 5 1994

Other

OtherProceedings of the 1994 ASCE National Conference on Hydraulic Engineering
CityBuffalo, NY, USA
Period8/1/948/5/94

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