ADJUSTMENTS TOWARD EQUILIBRIUM OF A LARGE FLOOD-TIDAL DELTA AFTER A MAJOR DREDGING PROGRAM, TAURANGA HARBOUR, NEW ZEALAND
No. 25 (1996), Conference Proceedings
No. 25 (1996)

ADJUSTMENTS TOWARD EQUILIBRIUM OF A LARGE FLOOD-TIDAL DELTA AFTER A MAJOR DREDGING PROGRAM, TAURANGA HARBOUR, NEW ZEALAND

Conference Proceedings
https://doi.org/10.9753/icce.v25.%25p
Published 1996-01-29
Terry Healy
Coastal Marine Group, Department of Earth Sciences, University of Waikato
Joseph Mathew
Coastal Marine Group, Department of Earth Sciences, University of Waikato
Willem de Lange
Coastal Marine Group, Department of Earth Sciences, University of Waikato
Kerry Black
Coastal Marine Group, Department of Earth Sciences, University of Waikato
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Keywords

harbor
Tauranga Harbor
New Zealand
tidal delta
flood tide
dredging
delta equilibrium

How to Cite

Healy, T., Mathew, J., de Lange, W., & Black, K. (1996). ADJUSTMENTS TOWARD EQUILIBRIUM OF A LARGE FLOOD-TIDAL DELTA AFTER A MAJOR DREDGING PROGRAM, TAURANGA HARBOUR, NEW ZEALAND. Coastal Engineering Proceedings, 1(25). https://doi.org/10.9753/icce.v25.%p
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Abstract

The Port of Tauranga is located within a tidal inlet estuarine lagoon system which has been dredged to improve navigation for shipping since 1968. In 1992 a major dredging program deepened the entrance navigation channel through the ebb-tidal delta from 10 to 14 m, and the inner harbor channels to -13 m. As a condition of the consent to dredge a detailed monitoring program was required which included annual hydrographic surveys over the flood and ebb-tidal delta as well as recording current meter records from morphodynamically sensitive locations to compare with records taken before the dredging. Results of the hydrographic surveys showed significant morphodynamic change of the flood-tidal delta had occurred essentially by the time the 6 month dredging program was completed. Comparison of the S4 current meter recordings showed current changes consistent with expectations of the EIA. Changes on the ebb-tidal delta were not expected but have occurred although not as rapidly, and seem to be ongoing.
https://doi.org/10.9753/icce.v25.%25p
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