Dunedin groundwater monitoring and forecasting datasets
Dunedin City in the South Island of New Zealand has many assets and critical infrastructure sitting on a low-lying coastal plain that is underlain by a largely unseen and relatively poorly understood hazard. Shallow groundwater in this area limits the unsaturated ground available to store rain and runoff, promotes flooding and creates opportunities for infiltration into stormwater and wastewater networks. Groundwater levels are expected to rise as sea level rises, causing greater frequency of flooding and/or direct inundation once it nears the ground surface. This zipped archive contains ArcGIS 10.8 geodatabases and spatial analysis of data gathered from a shallow groundwater monitoring network between 6/3/2019 and 1/5/2023. Data are licenced under Creative Commons Attribution 4.0 (CC-BY-4.0) licence without warranty. A series of statistical surfaces represent the present-day (2023) water table elevation and depth to groundwater, the response to rainfall recharge and tidal forcing, the available subsurface storage of rain infiltration. Simple geometric models have also been developed using the present shape and position of the water table, combined with tidal fluctuations, to forecast the future state of groundwater levels at 10 cm increments of sea level rise (up to 1 m). The geometric models are strongly empirical, with many implicit assumptions and caveats – particularly, that they do not account for groundwater flow and possible changes in water-budget mass balance. Although many variables and controlling processes are simplified into a single parameter, the projected groundwater levels highlight how local variations in the water table shape and slope interact locally with the ground elevation or infrastructure networks. They are best considered as a worst-case analysis of groundwater-related contribution to hazard and how this will evolve over time. Further description of these data, and implications from the analysis, can be found in Cox et al. (2023) GNS Science Report 2023/43 doi:10.21420/5799-N894.
Simple
- Date
- Purpose
- A set of geodatabases containing:1) Dunedin City Council three waters service network, containing data and observations extracted from interpolated models of groundwater data for Dunedin. 2) Geodatabase containing observations and interpolated models of groundwater data for Dunedin (see separate geodatabase for forecast effects of sea level rise) and 3) Grid datasets that forecast of the changing state of groundwater as sea levels rise, as groundwater level (GWL in m NZVD2016) and depth to groundwater (DTW).
- Credit
- Simon Cox/GNS Science 2023, to accompany GNS Science report 2023/43, DOI: 10.21420/5799-N894, ISBN: 978-1-99-105850-8
- Status
- Completed
- Maintenance and update frequency
- As needed
- Theme
-
- Forecast
- Sea level rise
- Groundwater
- Dunedin
- Metadata language
- English
- Character set
- UTF8
- Topic category
-
- Geoscientific information
N
S
E
W
- Distribution format
-
-
File Geodatabase
(
)
-
File Geodatabase
(
)
- OnLine resource
- Dunedin groundwater monitoring and forecasting full dataset ( WWW:LINK-1.0-http--link )
- OnLine resource
- GNS Science report: DUNEDIN GROUNDWATER MONITORING, SPATIAL OBSERVATIONS AND FORECAST CONDITIONS UNDER SEA-LEVEL RISE ( WWW:LINK-1.0-http--link )
- File identifier
- 06a86338-a0fa-436f-9c80-2d8da1dcd64f XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
- dataset
- Date stamp
- 2024-03-12T11:24:29
- Metadata standard name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata standard version
- 2007
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available