Distributed hydrological modelling for Great Barrier Reef catchments to simulate streamflows for input into marine models

Khan, Urooj; Pegios, Michael; D'Andrea, James; Hughes-Miller, Zac; Kazemi, Hamideh; Wells, Stephen C.; Moore, Robert J.; Cole, Steven J.; Cornish, Alex; Laugesen, Richard. 2024 Distributed hydrological modelling for Great Barrier Reef catchments to simulate streamflows for input into marine models. In: Shaping the future, Hydrology and Water Resources Symposium 2024 (HWRS2024). Engineers Australia and National Committee on Water Engineering, 3pp.

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Abstract/Summary

•The eReefs project is a collaboration between various Australian federal and state government organisations. The goal of eReefs is to drive effective, efficient and transparent management decisions through improved knowledge of the Great Barrier Reef (GBR) within the framework of the Reef 2050 Plan. The Water Models Team at the Bureau of Meteorology, working with the eReefs project partners and the UK Centre for Ecology & Hydrology (UKCEH), have developed a high spatiotemporal resolution distributed hydrological model Grid-to-Grid (G2G) over the entire GBR catchments including the Cape York region. Outputs from G2G are used as inputs to the marine hydrodynamic and biogeochemical models to simulate the marine environment and for preparing the Annual Reef Report Card which provides the information of health of GBR. •The G2G model has been applied at 0.01° (~1km) spatial resolution and hourly time-steps for the entire 459,418 km2 area draining to the GBR lagoon. G2G is able to simulate river flow at any location across the gridded model domain. This is achieved by using a variety of spatial datasets on landscape properties in combination with gridded, hourly time series of rainfall and potential evapotranspiration (PET). Various types of calibration have been performed to set up the G2G model. The Nash-Sutcliffe Efficiency (NSE) performance metric is calculated for all 317 streamflow gauging stations for historical simulations from 2007 to 2022. The median NSE over all sites for this period is ~0.7 which is very good given the size of the domain and the variability in river flows. •This is the first time such a high spatiotemporal resolution distributed hydrological model has been set up for the whole GBR region covering all gauged and ungauged areas. The G2G model can run automatically every day in the Amazon Web Service cloud environment.

Item Type:	Publication - Book Section
UKCEH and CEH Sections/Science Areas:	Hydro-climate Risks (Science Area 2017-)
ISBN:	9781925627893
Additional Information. Not used in RCUK Gateway to Research.:	To be cited as follows: Khan, U., Pegios, M., D'Andrea, J., Hughes-Miller, Z., Kazemi, H., Wells, S.C., Moore, R.J., Cole, S.J., Cornish, A., Laugesen, R., 2024. Distributed hydrological modelling for Great Barrier Reef catchments to simulate streamflows for input into marine models. Shaping the future, Hydrology and Water Resources Symposium 2024 (HWRS2024), 18-21 November 2024, Melbourne, Australia. Extended Abstract, 3pp, ISBN 978-1-925627-89-3.
Additional Keywords:	hydrology, model, streamflow, Great Barrier Reef, distributed, ungauged
NORA Subject Terms:	Hydrology
Date made live:	02 Dec 2024 11:53 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/538474

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