IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : A process-based river system model at a continental scale for water accounting
A process-based river system model at a continental scale for water accounting
Existing global and continental scale river models, mainly designed for integrating with global climate models, are of very
course spatial resolutions and they lack many important hydrological processes, such as overbank flow, irrigation
diversion, groundwater seepage/recharge, which operate at a much finer resolution. Thus, these models are not suitable
for producing streamflow forecast at fine spatial resolution and water accounts at sub-catchment levels, which are
important for water resources planning and management at regional and national scale. A large-scale river system model
has been developed and implemented for water accounting in Australia as part of the Water Information Research and
Development Alliance between Australia¡¯s Bureau of Meteorology (BoM) and CSIRO. The model, developed using nodelink
architecture, includes all major hydrological processes, anthropogenic water utilisation and storage routing that
influence the streamflow in both regulated and unregulated river systems. It includes an irrigation model to compute water
diversion for irrigation use and associated fluxes and stores and a storage-based floodplain inundation model to compute
overbank flow from river to floodplain and associated floodplain fluxes and stores. An auto-calibration tool has been built
within the modelling system to automatically calibrate the model in large river systems using Shuffled Complex Evolution
optimiser and user-defined objective functions. The auto-calibration tool makes the model computationally efficient and
practical for large basin applications. The model has been implemented in several large basins in Australia including the
Murray-Darling Basin, covering more than 2 million km2. The results of calibration and validation of the model shows highly
satisfactory performance. The model has been operationalised in BoM for producing various fluxes and stores for national
water accounting. This paper introduces this newly developed river system model describing the conceptual hydrological
framework, methods used for representing different hydrological processes in the model and the results and evaluation of
the model performance. The operational implementation of the model for water accounting is discussed.
File Size : 869,020 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 19/08/2015
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