Potential Impact of Geological Structures on Groundwater Flow Systems
Anzlic ID:
ANZVI0803005008
Custodian:
Abstract:
This dataset comprises a number of areas across Victoria which have been identified from the synthesis of geophysical data, topography, groundwater and other datasets to improve the understanding of how geological structures may control groundwater flow. Types of either Major or Other have been assigned to thirteen impact areas occurring predominantly in the north and west of the state. Major areas have been studied in detail as part of a report for the Secure Allocations Future Entitlements (SAFE) project called Potential Influences of Geological Structures on Groundwater Flow Systems (2012). Areas defined as Other contain geological structures of suspected impact and require detailed analysis.
Search Words:
Inland waters
,
Geoscientific information
Publication Date:
01 February 2018
Dataset Status:
Victoria
Progress:
Completed
Access Constraint:
Creative Commons Attribution 4.0 (CC-BY)
(
License Text
)
General
Data Existence:
Metadata Name
Descriptions
Resource Name:
GW_FLOW_IMPACT_STRUCT
Title:
Potential Impact of Geological Structures on Groundwater Flow Systems
Anzlic ID:
ANZVI0803005008
Custodian:
Owner:
Jurisdiction:
Victoria
Abstract:
This dataset comprises a number of areas across Victoria which have been identified from the synthesis of geophysical data, topography, groundwater and other datasets to improve the understanding of how geological structures may control groundwater flow. Types of either Major or Other have been assigned to thirteen impact areas occurring predominantly in the north and west of the state. Major areas have been studied in detail as part of a report for the Secure Allocations Future Entitlements (SAFE) project called Potential Influences of Geological Structures on Groundwater Flow Systems (2012). Areas defined as Other contain geological structures of suspected impact and require detailed analysis.
Search Words:
Inland waters
,
Geoscientific information
Purpose:
Geographic Extent Polygon:
Geographic Bounding Box:
-34
141
150
-39
Beginning to Ending Date:
2011-06-30 - 2012-06-30
Maintainence and Update Frequency:
As needed
Stored Data Format:
Available Format(s) Types:
DIGITAL
Positional Accuracy:
Not known
Attribute Accuracy:
Not known
Logical Consistency:
Not known
Data Source:
Dataset Source: The dataset comprises thirteen impact areas. Five areas have been assigned a type of Major for the following reasons:
Otway Basin Lower Tertiary (Wangerrip Group) Aquifer - an area of known faulting in the Lower Tertiary which required the existing seismic mapping to be corrected/value added to better define aquifer thickness impact and because it is an area where ENE and N-S structures were cross cutting the basin;
Gippsland Basin Latrobe Aquifer - an area of known faulting in the Lower Tertiary which had existing onshore/offshore seismic mapping that could be corrected/value added to define aquifer thickness impact and because the seismic mapping could show the continuity/connectivity of onshore aquifers and structure with areas of offshore fluid extraction that were known to be impacting onshore groundwater levels;
North-west Murray Basin - earlier and recent studies indicated impacts of structure on groundwater flow, due to ample evidence in the geophysics of the NW and ENE structures, in addition to four key N-S faults and possible anomalous bedrock related to structure, and where impacts on groundwater could be identified in a part of the State which has the least bore coverage and where the groundwater systems are the least characterised in detail;
Goulburn-Murray River Valleys - Nine Mile Creek area (Strathmerton) and Goulburn Valley (upper, middle and lower) were chosen because of good bore coverage which had previously been subjected to a lot of ground and regional geophysics coverage. This work indicated a complex bedrock (Permian and Palaeozoic) that appeared to be structurally controlled or controlling the Tertiary aquifer distribution and mixing of lesser quality groundwaters from the Goulburn aquifer system and the fresher ground water of the Murray system. Furthermore, there was evidence of anomalous bedrock and cross-cutting ENE-WSW structure which may enable a re-interpretation of the location of the ancient bedrock front with the Riverine plain and re-definition of the ancient Goulburn Valley;
Ovens Valley - a fresh water bedrock valley system with recent groundwater assessment but it had not been studied using methodologies applied to other bedrock valley systems further west and had limited geophysics input to groundwater assessment. Furthermore, there was evidence of cross cutting ENE-WSW structures and anomalous bedrock depth indications.
The remaining eight Areas assigned Other have been identified for the following broad reasons:
Differences in the bores-only contoured bedrock depth map and a bore-controlled residual gravity map at various locations across the state (which may have some basis in reality or is partly or wholly an artefact of limited borehole control and intra-bedrock gravity anomalies;
The local interaction of topography, magnetic, radiometric and to a lesser extent, gravity lineaments and apparent depo-centres;
The coincidence of locally fresher groundwaters, structures and scoria cones in the Western Volcanics plains (in the case of the Ballarat impact area).
The Streatham area which is part of the Wannon River catchment area has been examined in a little more detail.
Dataset Originality: Derived
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