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Article

Water Balance of a Small Island Experiencing Climate Change

1
CSIRO Land and Water, Black Mountain, Canberra, ACT 2601, Australia
2
CSIRO Land and Water, Sandy Bay, TAS 7005, Australia
3
CSIRO Land and Water, Waite, Urrbrae, SA 5064, Australia
4
CSIRO Land and Water, Dutton Park, QLD 4102, Australia
5
CSIRO Land and Water, Berrimah, NT 0828, Australia
*
Author to whom correspondence should be addressed.
Current Address: CSIRO Black Mountain Laboratories, Rossville, ACT 2601, Australia.
These authors contributed equally to this work.
Academic Editor: Renato Morbidelli
Water 2022, 14(11), 1771; https://doi.org/10.3390/w14111771
Received: 12 April 2022 / Revised: 25 May 2022 / Accepted: 25 May 2022 / Published: 31 May 2022
(This article belongs to the Special Issue Integrated Water Assessment and Management under Climate Change)
Small islands provide challenges to hydrological investigation, both in terms of the physical environment and available resources for hydrological monitoring. Furthermore, small islands are generally more vulnerable to natural disasters and water shortages for resident populations. Norfolk Island in the South–west Pacific, is typical in these respects, and recent water shortages have highlighted the lack of hydrological knowledge required to make informed decisions regarding water supply. Accordingly, a campaign of field measurements and analysis was conducted on Norfolk Island in the 2019–2020 period and these were compared to data from the 1970’s and 1980’s along with climate records to provide some insight into the behaviour and changes to the hydrology of the island over the last 50 years. Data indicates that a decline in rainfall across the 50 year water balance period (13%) combined with increased potential evapo-transpiration and changes to land cover have reduced recharge by 27%. Reduced recharge resulted in a significant decline in the groundwater potentiometric surface and runoff (reduced by around 57%). Examination of the water balance indicates that the majority (70–80%) of recharge across the 50 year period discharges to the ocean via cliff or submarine discharge. View Full-Text
Keywords: island hydrology; rainfall; non-stationarity; recharge; geological modelling; runoff; water balance island hydrology; rainfall; non-stationarity; recharge; geological modelling; runoff; water balance
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MDPI and ACS Style

Hughes, J.; Petheram, C.; Taylor, A.; Raiber, M.; Davies, P.; Levick, S. Water Balance of a Small Island Experiencing Climate Change. Water 2022, 14, 1771. https://doi.org/10.3390/w14111771

AMA Style

Hughes J, Petheram C, Taylor A, Raiber M, Davies P, Levick S. Water Balance of a Small Island Experiencing Climate Change. Water. 2022; 14(11):1771. https://doi.org/10.3390/w14111771

Chicago/Turabian Style

Hughes, Justin, Cuan Petheram, Andrew Taylor, Matthias Raiber, Phil Davies, and Shaun Levick. 2022. "Water Balance of a Small Island Experiencing Climate Change" Water 14, no. 11: 1771. https://doi.org/10.3390/w14111771

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