Ketelaar-Jones, S and Busch, B and Hipsey, M and Proemse, B and Maxwell, C and Barmuta, LA, Using flexible mesh modelling to simulate turbidity in a shallow, oligotrophic lake, Abstracts for the Australian Society for Limnology Conference 2017, 24-28 September, Sydney, pp. #115. (2017) [Conference Extract]
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We use a flexible mesh finite volume numerical model (TUFLOW-FV), coupled with an aquatic ecodynamics library (AED2) and surface wave model (SWAN) to simulate hydrodynamic, sediment transport and water quality processes. With a range of water levels and wind conditions we use the model to investigate sediment resuspension and consequent turbidity under different combinations of wind speed and water level.
Since we use a 3D mesh to define the lake area we are able to explore responses to water level and wind speed in different regions of the lake. In Woods Lake the critical areas of interest are littoral zones and vegetation beds and using the 3D mesh these areas can be specifically targeted with fine resolution modelling.
We simulated vegetation response to water circulation, sediment resuspension, and changing light climates, which allows us to explore the threshold where turbidity has a detrimental effect on ecosystem processes as a function of lake depth.
Outputs from the model are validated against values collected in the field. Overall, the model output provides further evidence about the depth thresholds where lake turbidities become excessive and can be used to refine operational risk bands.
|Item Type:||Conference Extract|
|Research Division:||Environmental Sciences|
|Research Group:||Environmental Science and Management|
|Research Field:||Environmental Management|
|Objective Group:||Physical and Chemical Conditions of Water|
|Objective Field:||Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use)|
|UTAS Author:||Ketelaar-Jones, S (Ms Saan Ketelaar-Jones)|
|UTAS Author:||Proemse, B (Dr Bernadette Proemse)|
|UTAS Author:||Barmuta, LA (Associate Professor Leon Barmuta)|
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