Publication Details |
| Category | Text Publication |
| Reference Category | Book chapters |
| Title (Primary) | Exploring the effects of future climate on lake and reservoir circulation in a tropical lake system: Lake Barrine |
| Title (Secondary) | 40th Hydrology and Water Resources Symposium, HWRS 2022, Brisbane, 30 November-2 December 2022 |
| Author | Deering, N.; Hutley, N.; Grinham, A.; Albert, S.; Boehrer, B.; Lemckert, C.; Gibbes, B. |
| Year | 2022 |
| Department | SEEFO |
| Page From | 580 |
| Page To | 589 |
| Language | englisch |
| Topic | T5 Future Landscapes |
| Abstract | A warming atmosphere, changing rainfall patterns and increased evaporation are hypothesised to disrupt natural mixing in lake systems. Top-to-bottom water column mixing, associated with annual stratification-destratification cycles, is important for preventing buildup of dissolved solids, such as iron and manganese, in anoxic bottom waters. Elevated concentrations of dissolved solids in lakes used for drinking water can result in additional treatment costs. Therefore, understanding potential future shifts in mixing is important when considering long-term water resource management. Numerical simulations of coupled thermal exchange and hydrodynamics were used to explore stratification-destratification cycles in Lake Barrine, North Queensland, Australia, under a range of future climates. The 1D General Lake Model (GLM) was applied, with development informed by in-situ field measurements of water temperature and local meteorological conditions over a complete stratification-destratification cycle. Data for future climates was derived from the coupled model intercomparison project phase 5 (CMIP5) simulations (RCP4.5 and 8.5 scenarios). Simulation results clustered into two interesting types: i) reduced water levels, including complete drying out of the lake in some cases; and ii) increase in stratification stability and associated reduced mixing, with the latter outcome being more common. Mixing frequency was found to decrease, except in simulations where water level dropped > 5 m below full supply. In these simulations mixing increased due to shallower water conditions. The wide variation in potential future conditions highlights the challenges faced by water resource managers when developing future strategies. Some results suggest a need to plan for reduced water availability, with no significant changes to stratification and subsequent management of dissolved solids. Others suggest changes in water availability combined with a risk of reduced mixing and increased dissolved solid concentrations. Further investigation might provide additional insights however, there is also a need to explore how water resource management frameworks can better incorporate diverging future scenarios. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23311 |
| Deering, N., Hutley, N., Grinham, A., Albert, S., Boehrer, B., Lemckert, C., Gibbes, B. (2022): Exploring the effects of future climate on lake and reservoir circulation in a tropical lake system: Lake Barrine 40th Hydrology and Water Resources Symposium, HWRS 2022, Brisbane, 30 November-2 December 2022 Engineers Australia, p. 580 - 589 |
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