Print Email Facebook Twitter Thermally destratifying lakes against blue algae with rising air bubbles Title Thermally destratifying lakes against blue algae with rising air bubbles Author Hekstra, M.A. Contributor Hoes, O.A.C. (mentor) Michielsen, B. (mentor) Zijlema, M. (mentor) Van de Giesen, N. (mentor) Chua, V.P. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Programme Hydraulic Engineering and Water Resources Management (TU Delft-NUS double degree programme) Date 2015-12-09 Abstract Mixing systems are used in deep lakes to prevent blue algae from rapidly growing. Air bubbles rise from the bed, dragging water from below upwards. The resulting vertical circulation suppresses blue algae growth. However, these systems demand electricity of about 25,000 per km2 per year. The airlift promises to mix the water more efficiently, using a vertical tube wherein the bubbles rise. Small-scale laboratory experiments presented in this thesis show that the airlift is slightly slower in completely removing stratification than a single bubble plume with the same air flow. 3D schematisations hereof using Delft3D are indifferent. A case study using 3D schematisations of Lake Haarlemmermeerse Bos also shows that the airlift is not more efficient. Hence generally the airlift is not better for lake destratification than a bubble plume system. Subject MixingBlue algaeCyanobacteriaBloomsAirliftDelft3DModellingHaarlemmermeerse BosHaarlemmermeerse BosplasRijnland To reference this document use: http://resolver.tudelft.nl/uuid:9226b49f-47ea-4993-84e6-62f2896a7731 Coordinates 52.326920, 4.671899 Part of collection Student theses Document type master thesis Rights (c) 2015 Hekstra, M.A. Files PDF Thesis_Matthijs_Hekstra.pdf 2.05 MB Close viewer /islandora/object/uuid:9226b49f-47ea-4993-84e6-62f2896a7731/datastream/OBJ/view