Modelling surface-groundwater interaction in the Ruataniwha basin, Hawke's Bay, New Zealand

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Modelling groundwater and surface water is important for integrated water resources management, especially when interaction between the river and the aquifer is high. A transient groundwater and surface water flow model was built for Ruataniwha basin, New Zealand. The model covers a long-time period; starting in 1990, when water resources development in the area started, to present date. For a better resolution, the simulation period was divided into 59 stress periods, and each stress period was divided to 10 time steps. The model uses data obtained from surface water, and groundwater collected over the last 20 years. Rivers and streams were divided into 28 segments and flow and streambed data at the beginning and end of each segment was used. Parameter estimation and optimisation 'PEST' was used for automatic calibration of hydraulic conductivity, groundwater recharge and storativity; whereas riverbed conductance was manually calibrated. Model results show that the rivers gain from the aquifer considerably more than the river losses. The cumulative groundwater abstraction over the last 20 years is approximately 210 million m 3. This amount is very low compared to other water budget components; however, the effect of groundwater abstraction on storage is significant. Based on the results of this study, it was found that the loss of storage over the last 20 years is more than 66 million m 3. Results also reveal that the effect of groundwater abstraction on rivers and springs flow is significant. The rivers gain from the groundwater system, and the springs flow have been decreasing.

Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalEnvironmental Earth Sciences
Volume66
Issue number1
DOIs
Publication statusPublished - May 2012
Externally publishedYes

Fingerprint

Catchments
Groundwater
groundwater
groundwater extraction
basins
groundwater abstraction
rivers
Rivers
basin
river
modeling
surface water
Surface waters
stream channels
aquifers
Springs (water)
Water resources
Aquifers
aquifer
groundwater recharge

Keywords

  • Groundwater modelling
  • Modflow
  • Ruataniwha basin
  • Stream depletion
  • Surface/groundwater interaction

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geology
  • Global and Planetary Change
  • Pollution
  • Water Science and Technology
  • Environmental Chemistry
  • Soil Science

Cite this

Modelling surface-groundwater interaction in the Ruataniwha basin, Hawke's Bay, New Zealand. / Baalousha, Husam.

In: Environmental Earth Sciences, Vol. 66, No. 1, 05.2012, p. 285-294.

Research output: Contribution to journalArticle

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