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Category: hydrologic models

How many zeros is too many for reliable streamflow predictions?

How many zeros is too many for reliable streamflow predictions?

Contributed by Mark Thyer, David McInerney and Dmitri Kavetski, University of Adelaide. Ephemeral catchments, where there are days with zero flow, are common in many parts of the world, particular in areas with highly variable climate such as Australia (see Figure 1). Recent research has established how the number of days with zero flow impacts the reliability of probabilistic streamflow predictions in ephemeral catchments (McInerney et al., 2019). When there exists days with zero flow, producing reliable probabilistic predictions is…

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Assimilation of in-situ and satellite data in hydrological predictions – Can we add value?

Assimilation of in-situ and satellite data in hydrological predictions – Can we add value?

Contributed by Jude Musuuza (SMHI). The increased focus on satellite missions in recent years has resulted in a rich source of valuable Earth Observations (EO), in terms of spatial coverage and temporal frequencies that are impossible to achieve with direct measurements. Such observations have been used in various disciplines, including also hydrological modelling, for instance to improve process understanding through tailored model parameterisation and performance assessment. In addition EOs have been used to (better) initialise the model states which further…

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Helping shape a new flood forecasting service in The wellington region, new zealand

Helping shape a new flood forecasting service in The wellington region, new zealand

Contributed by Michael Cranston (RAB), Andy Brown (Greater Wellington Regional Council) and Bapon Fakhruddin (Tonkin and Taylor). The flooding challenge in Wellington Greater Wellington Regional Council (GWRC) are embarking on a programme to establish improved flood forecasting services across the Wellington Region on New Zealand’s north island. Flooding is considered New Zealand’s number one natural hazard with flood emergencies estimated to have cost $17 million a year in insurance payments and $15 million in emergency management expenditure between 1968 and…

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GloFAS-ERA5 reanalysis: River discharge ‘maps without gaps’ from 1979-present

GloFAS-ERA5 reanalysis: River discharge ‘maps without gaps’ from 1979-present

Contributed by Shaun Harrigan, ECMWF. In an ideal world we would have river discharge measurements for every river spanning many decades and updated in real time. We all know this is very far from reality with severe gaps in the global observing network (Lavers et al., 2019), and provides a fundamental challenge for hydrological monitoring and forecasting. A way forward pioneered in the field of meteorology and climate is to optimally combine available in situ and satellite Earth system observations…

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HEPEX Advances and Applications at MODSIM

HEPEX Advances and Applications at MODSIM

At the 23rd International Congress on Modelling and Simulation (MODSIM2019), from 1-6 December 2019 in Canberra, Australia, a HEPEX session highlighted recent work in hydrometeorological forecasting. Seline Ng from CSIRO discusses HEPEX highlights from MODSIM2019: We are glad to report that our session titled “Advances and applications in hydrometeorological forecasting” at the recent MODSIM2019 conference in Canberra, Australia went well, with a strong showing by the Australian Bureau of Meteorology (BOM), CSIRO Land & Water and University of Melbourne. Ours…

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