Galilee model recharge estimates: chloride mass balance v02

Abstract

This dataset was derived by the Bioregional Assessment Programme. The parent datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.

This dataset contains raster data layers estimating the rate of groundwater recharge for each hydrogeological formation in the Galilee subregion, by a chloride mass balance method. This method compares groundwater chloride concentrations (GUID: 6b1a0358-40d6-4bcf-b864-28cb2c823fd1) with chloride deposition in rainfall (GUID: c1649bd7-227f-41ff-9964-b55479bef640) for each hydrogeological formation. Cell values for each raster represent a rate in mm/year.

Purpose

This dataset is created to provide groundwater recharge volume estimates as an input into the Galilee groundwater model. For the purposes of the model, boundary extents used in the calculations are simplified and estimates should be used with caution if using for another purpose.

Dataset History

To create the recharge extent grids, the input data went through the following processes:

1. Groundwater chloride concentration (Point data to raster)

Using the 'Topo to Raster' Tool in ArcCatalog, the input chloride data (GUID: 6b1a0358-40d6-4bcf-b864-28cb2c823fd1) for each hydrogeological formation's outcrop extent was converted into a raster dataset using the following parameters:

Feature layer - Input chemistry point data (GUID: 6b1a0358-40d6-4bcf-b864-28cb2c823fd1)

Field - Cl

Type - Point Elevation

Output cell size - 0.01

Output extent - Recharge outcrop (GUID: b0f0385e-c456-4fa4-9cdb-a5441cca407b)

Margin in cells - 20

Smallest z value to be used in interpolation - 10th percentile of Chloride Values

Largest z value to be used in interpolation - 90th percentile of Chloride Values

Drainage enforcement - NO_ENFORCE

Primary type of input data - SPOT

Maximum number of iterations - 40

1. Output Chloride grid clipped to recharge boundary

Using the 'Extract by Mask' tool in ArcCatalog, the newly created chloride raster was clipped to the boundary of the recharge extent for each formation from the Galilee Groundwater Model, Hydrogeological Formation Recharge (Outcrop) Extents v01 (GUID: b0f0385e-c456-4fa4-9cdb-a5441cca407b) dataset.

1. Chloride mass balance calculation between the groundwater chloride raster and the chloride deposition in rainfall raster (cl_deposition_final ascii file from the dataset - Australian 0.05º gridded chloride deposition v2 - GUID: c1649bd7-227f-41ff-9964-b55479bef640).

Using the 'Raster Calculator' Tool in Arc Catalogue the following statement was used to calculate the final recharge estimate for each formation: ([cl_deposition_final]" * 100) / [clipped groundwater chloride raster]

Dataset Citation

Bioregional Assessment Programme (2015) Galilee model recharge estimates: chloride mass balance v02. Bioregional Assessment Derived Dataset. Viewed 07 December 2018, http://data.bioregionalassessments.gov.au/dataset/d42a8497-9d67-42ad-9e7d-70a8d519875f.

Dataset Ancestors

• Derived From Galilee Hydrochemistry: Quality control for Chloride model recharge v02

• Derived From Queensland petroleum exploration data - QPED

• Derived From Three-dimensional visualisation of the Great Artesian Basin - GABWRA

• Derived From Phanerozoic OZ SEEBASE v2 GIS

• Derived From Galilee Groundwater Model, hydrogeological formation recharge (Outcrop) extents v01

• Derived From QLD Department of Natural Resources and Mines Groundwater Database Extract 20142808

• Derived From Galilee Groundwater Model, Hydrogeological Formation Extents v01

• Derived From GAL Aquifer Formation Extents v01

• Derived From Queensland Geological Digital Data - Detailed state extent, regional. November 2012

• Derived From QLD Geological Digital Data - QLD Geology, Structural Framework, November 2012

• Derived From Australian 0.05º gridded chloride deposition v2

• Derived From GAL Aquifer Formation Extents v02