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    Exploring changes in Nitrate contamination in the coastal and Hautere zone Aquifer Wellington New Zealand

    Wanigasekera, Deepthi Jayatha Dias-; De Costa, Gregory; Worden, John; Wanigasekera, Beatrice Dias-

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    Date
    2013
    Citation:
    Wanigasekera, D. J., De Costa, G., Warden, J., and Wanigasekera, B. (2013). Exploring changes in NItrate contamination in the coastal and Hautere zone Aquifer Wellington New Zealand. Proceedings of the 2013 IAHR World Congress, China(Ed.),
    Permanent link to Research Bank record:
    https://hdl.handle.net/10652/2777
    Abstract
    Fifteen years of groundwater quality monitoring in the Kapiti Coast by the local authority in Wellington, New Zealand, has identified an area of elevated nitrate concentrations in the Te Horo area, with some monitoring bores testing for concentrations above 5 mg/L. However, recent analysis seems to indicate that contaminant levels have decreased from what was previously recorded, although still remaining elevated. The purpose of this study is to investigate if changes in nitrate concentrations over time were significant, and, if so, determine which factors have contributed to these changes. Initial temporal trend analysis indicated that nitrate concentrations since 1993 have decreased in the majority of monitoring bores. Tobit regression analysis was subsequently undertaken using several land use, land cover, soil type, climate and chemical explanatory variables. Results indicated that beef cattle farming, fruit growing, settlements and lifestyle blocks were associated with increased nitrate concentrations. Groundwaters higher in dissolved oxygen which underlie fine sandy loam soils (which are highly permeable soils) were also identified as been susceptible to higher nitrate concentrations.It was ultimately determined that the temporal decrease in concentrations is best explained by improved land use practices as physical characteristics and land cover overlying groundwater had not changed substantially and thereby explaining the decreasing trend in nitrate concentrations.
    Keywords:
    Hautere zone, Wellington (N.Z.), groundwater, aquifers, nitrate contamination, New Zealand
    ANZSRC Field of Research:
    090509 Water Resources Engineering
    Copyright Holder:
    International Association for Hydro-Environment Engineering and Research (IAHR)

    Copyright Notice:
    All rights reserved
    Available Online at:
    http://www.iahr2013.org/
    Rights:
    This digital work is protected by copyright. It may be consulted by you, provided you comply with the provisions of the Act and the following conditions of use. These documents or images may be used for research or private study purposes. Whether they can be used for any other purpose depends upon the Copyright Notice above. You will recognise the author's and publishers rights and give due acknowledgement where appropriate.
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