Potential Groundwater Dependent Ecosystem (GDE) Mapping for the Goulburn Broken CMA

dataset: GDE_TERR_GBCMA
Potential Groundwater Dependent Ecosystems (GDE) are ecosystems identified within the landscape as likely to be at least partly dependent on groundwater. State-wide screening analysis was performed to identify locations of potential terrestrial GDEs, including wetland areas. The GDE mapping was developed utilising satellite remote sensing data, geological data and groundwater monitoring data in a GIS overlay model. Validation of the model through field assessment has not been performed. The method has been applied for all of Victoria and is the first step in identifying potential groundwater dependent ecosystems that may be threatened by activities such as drainage and groundwater pumping. The dataset specifically covers the Goulburn Broken Catchment Management Authority (CMA) area. The method used in this research is based upon the characteristics of a potential GDE containing area as one that: 1. Has access to groundwater. By definition a GDE must have access to groundwater. For GDE occurrences associated with wetlands and river systems the water table will be at surface with a zone of capillary extension. In the case of terrestrial GDE's (outside of wetlands and river systems), these are dependent on the interaction between depth to water table and the rooting depth of the vegetation community. 2. Has summer (dry period) use of water. Due to the physics of root water uptake, GDEs will use groundwater when other sources are no longer available; this is generally in summer for the Victorian climate. The ability to use groundwater during dry periods creates a contrasting growth pattern with surrounding landscapes where growth has ceased. 3. Has consistent growth patterns, vegetation that uses water all year round will have perennial growth patterns. 4. Has growth patterns similar to verified GDEs. The current mapping does not indicate the degree of groundwater dependence, only locations in the landscape of potential groundwater dependent ecosystems. This dataset does not directly support interpretation of the amount of dependence or the amount of groundwater used by the regions highlighted within the maps. Further analysis and more detailed field based data collection are required to support this. The core data used in the modelling is largely circa 1995 to 2005. It is expected that the methodology used will over estimate the extent of terrestrial GDEs. There will be locations that appear from EvapoTranspiration (ET) data to fulfil the definition of a GDE (as defined by the mapping model) that may not be using groundwater. Two prominent examples are: 1. Riparian zones along sections of rivers and creeks that have deep water tables where the stream feeds the groundwater system and the riparian vegetation is able to access this water flow, as well as any bank storage contained in the valley alluvials. 2. Forested regions that are accessing large unsaturated regolith water stores. The terrestrial GDE layer polygons are classified based on the expected depth to groundwater (ie shallow <5 m or deep >5 m). Additional landscape attributes are also assigned to each mappnig polygon. In 2011-2012 a species tolerance model was developed by Arthur Rylah Institute, collaborating with DPI, to model landscapes with ability to support GDEs and to provide a relative measure of sensitivity of those ecosystems to changes in groundwater availability and quality. Rev 1 of the GDE mapping incorporates species tolerance model attributes for each potential GDE polygon and attributes for interpreted depth to groundwater. Separate datasets and associated metadata records have been created for GDE species tolerance.
 
Citation proposal Citation proposal
(2013)

Potential Groundwater Dependent Ecosystem (GDE) Mapping for the Goulburn Broken CMA

Department of Environment, Land, Water & Planning
 

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Identifiers and Keywords

ANZLIC Id
ANZVI0803005163 
Victorian Spatial Data Library (VSDL) Schema
WATER:GDE_TERR_GBCMA 
Jurisdiction
Victoria 
Topic category
  • Inland waters
  • Biota
  • Geoscientific information
 

Resource Constraints

Use limitation
General 
Classification
Unclassified  
Creative Commons Attribution 4.0 (CC-BY)
 

Other Dataset Details

Date ( Revision )
2013-11-18
Date ( Publication )
2018-02-01T09:18:36
Status
Completed  
Supplemental Information
Related Documents: None For further information, see: Dresel PE, Clark R, Cheng X, Reid M, Terry A, Fawcett J and Cochrane D 2010, Mapping Terrestrial Groundwater Dependent Ecosystems: Method Development and Example Output, Department of Primary Industries, Melbourne, Victoria, 66 pp. 
Maintenance and update frequency
Irregular  
Maintenance date ( Publication )
2018-02-01T09:18:36
 

Spatial

Spatial representation type
Vector  
Reference system identifier
4283



 

Temporal

Begin date
1995-02-01 
End date
2005-12-31 
 

Resolution

Horizontal Accuracy
100m  
 

Quality

Conceptual Consistency
Not known 
Missing Data
Goulburn Broken CMA area 
Attribute Quality
Not known 
Positional Accuracy
As accurate as the source data 
 

Lineage

Statement
Dataset Source: The maps are created from base layers of Landsat imagery from 1988 to 2005 that was supplied by the Australian Greenhouse Office (AGO) and time series data from the NASA WIST website supplied the Modis (MOD13Q1) product for 2003. Additional base layers that were used include the Geological 250 series, Geomorphological Management Units, Wetland and EVC Layer Stream Gauge catchments. Expert analyses selected thresholds within the data sets that were combined within a Weighted Overlay Model and converted to Shape files for use. Dataset Originality: Derived 
 

Attributes

Column Name Obligation Unique Data Type Data Length Data Precision Data Scale Reference Table Owner Reference Table Name Reference Table Code Column Name Short Column Name Definition
GWI_CODE O N NUMBER 22 4 0 GWI_CODE
AREA_HA O N NUMBER 22 38 8 AREA_HA
DESCRIPTIO O N VARCHAR2 165 DESCRIPTIO
SHAPE_NUMBER O N NUMBER 22 38 8 SHAPE_NUM
SUR_GEOLGY O N VARCHAR2 13 SUR_GEOLGY
GMU O N VARCHAR2 5 GMU
TOL_MED O N NUMBER 22 38 8 TOL_MED
GW_TDS O N VARCHAR2 13 GW_TDS
DTW_MAJOR O N NUMBER 22 10 0 DTW_MAJOR
 

About the Metadata Record

Metadata identifier
b2873ab1-8b6e-5dee-9912-059737e86e83

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Resource Type
Dataset  
Date info ( Revision )
2013-11-18
Standard Name
ISO 19115-3:2018 
Profile Name
DELWP Profile 
Profile Version
Version 1 
Profile Date
2019-05-24  
 

Metadata Constraints

Classification
Unclassified  
 
 

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