Calibration of river models for the Flinders and Gilbert catchments. A technical report to the Australian Government from the CSIRO Flinders and Gilbert Agricultural Resource Assessment, part of the North Queensland Irrigated Agriculture Strategy

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Lerat, Julien; Egan, Chas; Kim, Shaun; Gooda, Matt; Loy, Alex; Petheram, Cuan

Lerat, Julien; Egan, Chas; Kim, Shaun; Gooda, Matt; Loy, Alex; Petheram, Cuan


2013-12-19


Report


139 p


This report presents the methods for and results of the calibration of two river models developed for the Flinders and Gilbert Agricultural Resource Assessment (the Assessment), which is part of the North Queensland Irrigated Agriculture Strategy (NQIAS). These two models constitute the main tools that will be used in subsequent phases of the Assessment, to investigate the availability and reliability of water supply and to assess downstream perturbations of flow under historical and future climate scenarios and potential development storylines. One of the key principles of the National Water Initiative (2004) was that water resource planning should be undertaken within a risk analysis framework. Theoretical and technical challenges make this challenging to undertake in an operational environment. This report details a new method of constructing a river system model that enables water resource planning to be undertaken within a risk analysis framework. To enable this, particularly innovative aspects of this study were i) the joint calibration of rainfall-runoff, routing and water loss components; which facilitated ii) an uncertainty analysis based on random perturbation of streamflow data, guided by the uncertainty in the streamflow to stage height relationships. The calibration of the river models was a collaborative effort between CSIRO and the Queensland Government. Based on an agreed calibration method, detailed in this report, the Flinders and Gilbert river system models were calibrated by CSIRO and the Queensland Government respectively. The specific objectives of this technical report are to: • Document the hydro-meteorological data used to develop the Assessment river system models for the Flinders and Gilbert catchments. • Describe the methods by which the Assessment river models for the Flinders and Gilbert catchments were developed and calibrated. • Document the Assessment river models' configuration and underlying assumptions. • Assess and report the Assessment's river models' performance. • Evaluate how much water is in the river at different locations and different times, under the historical climate and current levels of development. Model set-up and calibration The configuration of the eWater Source models was initially based on the Flinders and Gilbert Integrated Quantity-Quality Models (IQQM) (DRNM, 2006a and 2006b), which were developed by the Queensland Government to support the preparation of the Gulf Water Resources Plan. The IQQM configuration was subsequently translated into the eWater Source software package. The IQQM and the Source river models were run in parallel to ensure that the model was translated faithfully. Additional model nodes were incorporated in the models developed for the Assessment to improve their spatial resolution in key areas (particularly in the vicinity of potential irrigation areas and dam sites). The increased spatial resolution was desirable because it better captured rainfall gradients, and also allowed a wider range of development scenarios to be examined. Once the Source river models had been reconfigured, they were subsequently recalibrated using gridded SILO climate data (Jeffery et al. 2001) and observed streamflow data according to the agreed set of methods. Although only nine gauging stations are currently open in the Flinders catchment and only six are open in the Gilbert catchment, historical data from 22 and 19 gauging stations were used to calibrate the Flinders and Gilbert river models, respectively. ...


CSIRO


Canberra, A.C.T.


Surfacewater Hydrology


Published Version (pdf) (25.93MB)


https://doi.org/10.4225/08/584d96511fb59


This report has been placed on the CSIRO repository and may be made available to persons outside of CSIRO for non commercial purposes, in its entirety and without deletion of disclaimers and copyright information.


CSIRO Water for a Healthy Country Flagship Report Series


EP132648


Technical Report (Author)


English


1835095X


Lerat, Julien; Egan, Chas; Kim, Shaun; Gooda, Matt; Loy, Alex; Petheram, Cuan. Calibration of river models for the Flinders and Gilbert catchments. A technical report to the Australian Government from the CSIRO Flinders and Gilbert Agricultural Resource Assessment, part of the North Queensland Irrigated Agriculture Strategy. Canberra, A.C.T.: CSIRO; 2013. csiro:EP132648. https://doi.org/10.4225/08/584d96511fb59



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