WaterCAST: whole of catchment hydrology model. An overview

Cook, F. J., Jordan, P. W., Waters, D. K. and Rahman, J. M. (2009). WaterCAST: whole of catchment hydrology model. An overview. In: R. S. Anderssen, R. D. Braddock and L. T. H. Newham, 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Proceedings. The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation, Cairns, QLD, Australia, (3492-3499). 13-17 July, 2009.

Author Cook, F. J.
Jordan, P. W.
Waters, D. K.
Rahman, J. M.
Title of paper WaterCAST: whole of catchment hydrology model. An overview
Conference name The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation
Conference location Cairns, QLD, Australia
Conference dates 13-17 July, 2009
Proceedings title 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Proceedings
Journal name 18Th World Imacs Congress and Modsim09 International Congress On Modelling and Simulation
Place of Publication Christchurch, NZ
Publisher Modelling and Simulation Society of Australia and New Zealand
Publication Year 2009
Sub-type Fully published paper
Open Access Status
ISBN 9780975840078
Editor R. S. Anderssen
R. D. Braddock
L. T. H. Newham
Start page 3492
End page 3499
Total pages 8
Language eng
Formatted Abstract/Summary
Sharing of water resources between traditional water users and the environment is becoming increasingly complex due to competion by different sectors of the economy and environment for what is often a diminishing resource and has resulted in the need for a whole-of-catchment modeling approach that can be used to improve the strategic management of water resources. WaterCAST (Water and Contaminant Analysis and Simulation Tool) is a whole of catchment model which has been developed by the eWater CRC in response to this demand. Catchment models are by necessity a compromise between detailed description of processes local scale which are then summed up and description of emergent processes that are manifest at large scales. WaterCAST provides a flexible modelling framework in which the level of detail is dependent upon data availability and the questions that are being asked of the model. Developments to WaterCAST are aimed at improving its capabilities.

In particular major developments are occurring to improve the capability of WaterCAST so that is can reliably estimate water, solute and sediment transport in regulated and unregulated catchments. An overview of the structure of WaterCAST and future developments is presented. WaterCAST presently uses a spatial structure consisting of functional units (FUs), sub-catchments, nodes and links. FUs are the smallest spatial unit and are areas of consistent hydrologic response. The sub-catchments are defined usually from a digital elevation models but allow users to refined these sub-catchments. Sub-catchments have at least one FU and a node at the bottom through which outputs of water an d constituents (solute and sediments). They may also contain a link if other sub-catchments discharge into them. Both surface generated and groundwater are transported to the nodes and filter models can be used to change the delivered volume or time of delivery. The nodes are linked to form a network that ends at the final node at the end of the catchment. The spatial structure is being modified to include a gridded structure within the sub-catchment and future developments will include the concept of area bands within sub-catch ments. The hydrology is generated from one of a range of water balance models available and applied at the FU scale.

Generation of constituents is modeled using either; event mean concentration and dry weather concentration concepts, corelation between water flow and constituents or observed data. The water, solutes and sediments are transported from the FU’s to a node in a sub-catchment via filter functions. Current developments include a new water balance model, stochastic rainfall generation, and more process based sediment generation and nutrient transport models. The model structure is developed on a plug and play basis which allows users to implement their own component models if they wish.

The eWater CRC WaterCAST model represents state of the art, software designed for practitioners and researchers to solve real world problems..
Subjects 1703 Computational Theory and Mathematics
2605 Computational Mathematics
2611 Modelling and Simulation
Keyword Hydrology
Water quality
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Agriculture and Food Sciences
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Wed, 27 Nov 2013, 13:58:22 EST by System User on behalf of School of Land, Crop and Food Sciences