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- Clarence-Moreton bioregion
- 2.1-2.2 Data analysis for the Clarence-Moreton bioregion
- 2.1.1 Geography
- 2.1.1.2 Statistical analysis and interpolation

All geographic data specific to the Clarence-Moreton bioregion were obtained from state or national datasets. This means no statistical analysis or interpolation was performed to generate any of the geographic datasets. However, to characterise errors of the input climate data used for the water balance modelling, some bioregion-specific spatial analysis was performed. This is a useful characterisation to better understand the limitations of the input data. This analysis is outlined in this section.

In addition to generating daily and monthly grids of meteorological variables (P, T_{max} and T_{min}), the Bureau of Meteorology (Jones et al., 2009) also generate daily and monthly root-mean-square error (RMSE) grids of the same variables. These daily and monthly RMSE grids are a combined measure of the observational error and geostatistical error. The latter is a function of the interpolation algorithm, density of isolated station observations and degree of spatial autocorrelation of the process(es) driving the spatial variance captured in the data being interpolated.

To characterise errors of the input climate data the long-term (from January 1980 to December 2009) monthly mean values for P, T_{max} and T_{min} were calculated. Also calculated were the long-term monthly RMSE mean values for the same variables for the same time period. Relative error, expressed as a percent, was calculated by dividing the monthly RMSE mean grid by the monthly mean grids (i.e. RMSE grid/mean grid for each meteorological variable).

The spatially-averaged long-term monthly mean P for the Clarence-Moreton bioregion is 110 mm/month, and the associated P RMSE mean for the bioregion is 45 mm/month (see Figure 3a and Figure 3b, respectively). This results in a relative error of 47.5% in the input P grids (Figure 3c). The relatively high error is due, in part, to P being a highly spatially variable process (it has low spatial autocorrelation).

Data: Bioregional Assessment Programme (Dataset 1)

For air temperatures, a meteorological field that has higher spatial autocorrelation than P, regional distribution is governed by topography and distance from the ocean. The T_{max} spatially-averaged long-term monthly mean is 22 °C for the Clarence-Moreton bioregion (Figure 4a). The associated RMSE is approximately 0.47 °C (Figure 4b), which leads to a relative error of 2% for T_{max} (Figure 4c). For T_{min} in the Clarence-Moreton bioregion, there are similar spatial patterns, with the spatially-averaged long-term monthly mean being 12.5 °C (Figure 5a) and the associated RMSE being approximately 0.69 °C (Figure 5b), which leads to a relative error of 8% for T_{min }(Figure 5c).

Data: Bioregional Assessment Programme (Dataset 1)

Data: Bioregional Assessment Programme (Dataset 1)

## Product Finalisation date

- 2.1.1 Geography
- 2.1.2 Geology
- 2.1.2.1 Methods
- 2.1.2.2 Observed data
- 2.1.2.3 Statistical analysis and interpolation
- 2.1.2.3.1 Three-dimensional geological model workflow
- 2.1.2.3.2 Definition of the stratigraphic column
- 2.1.2.3.3 Selection of input datasets
- 2.1.2.3.4 Representation of structural elements in the three-dimensional geological model
- 2.1.2.3.5 Characterisation of binding horizons of shallow aquifers (alluvium and basalt)
- 2.1.2.3.6 Characterisation of the bedrock stratigraphic units in the Clarence-Moreton bioregion
- 2.1.2.3.7 Isopach maps, depth to formation top and depth to base of formation

- 2.1.2.4 Gaps
- References
- Datasets

- 2.1.3 Hydrogeology and groundwater quality
- 2.1.4 Surface water hydrology and water quality
- 2.1.5 Surface water – groundwater interactions
- 2.1.6 Water management for coal resource developments
- Glossary
- Citation
- Acknowledgements
- Contributors to the Technical Programme
- About this technical product