Peer review of saline intrusion model and risk assessment for the exploration phase of the Wellington Harbour Exploration Bores Project
This report presents a peer review of groundwater modelling work carried out by Earth in Mind as part of the exploration phase Wellington Harbour Exploration Bores project (termed SP1a). The SP1a project has the objective of determining whether the Waiwhetu aquifer below Wellington harbour can provide an alternative resilient drinking water supply for central Wellington in the event of a civil defence emergency. To determine this, the SP1a project addressed significant information gaps regarding the geological and hydrogeological properties of the offshore extension of the Waiwheto and underlying Moera aquifers. This was achieved through geophysical exploration, geological analysis, exploration drilling and testing of two bores in Wellington Harbour. The new information was used to refine an existing conceptual model of groundwater flow beneath Wellington Harbour. This conceptual model was subsequently used during the refinement of an existing groundwater flow model. The refined groundwater flow model was then used as the basis for the development of a variable density flow and transport (i.e., SEAWAT) model. The groundwater models were used to assess risk of seawater intrusion associated with offshore extraction from the Waiwhetu aquifer in Wellington Harbour, in the event of a civil defence emergency.
SubjectsField of Research::04 - Earth Sciences::0406 - Physical Geography and Environmental Geoscience::040603 - Hydrogeology
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