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Observations of rip channels, sandbar-shoreline coupling and beach rotation at Tairua beach, New Zealand

Observations of rip channels, sandbar-shoreline coupling and beach rotation at Tairua beach, New Zealand
Observations of rip channels, sandbar-shoreline coupling and beach rotation at Tairua beach, New Zealand
Interannual wave climate variations along the north east coast of New Zealand have caused significant changes to the erosional state of many of the popular tourist beaches. These changes threaten property, ruin expensive and labour-intensive dune plantings and destabilise walkways. The alongshore spatial and temporal variation of erosion can, however, not always be directly dependant on the variability in the wave climate. The response appears to be dependant on the alongshore extent of the beach and the existence of headlands. This work takes a 3.4 year data-base of rip channel location, sandbar position and shoreline position to quantify the patterns that occur on a headland-controlled embayed beach. Findings show that when wave events had a strong alongshore component, the alongshore bar and shoreline rotated and three dominant, persistent, rip channels developed on the end of the beach at which both the shoreline and barline were more seaward. This pattern where the beach rotated in one direction occurred on three occasions: at the beginning of the dataset (early 1999), during the persistent small storms during the winter of 2000, and in the other direction during the large storm in mid 2001. The rotation events were clearly related to the dominance of northward versus southward alongshore flux events over 3500 J/m2. These results show that on embayed beaches, the alongshore wave energy flux is pivotal in controlling shoreline erosion and the severity and location of rip channels.
270-275
Engineers Australia
Bryan, K.R.
02d42071-7100-4ef5-9bba-4b14bdbd9277
Gallop, S.L.
c14133fc-9141-47d9-ae9c-84c2513ea8ad
van de Lageweg, W.I.
56b3c655-1466-4cf9-8b9e-fa8dd29d5edd
Coco, G.
2fd53078-aedb-4f12-bb28-d69b74d8ad64
Bryan, K.R.
02d42071-7100-4ef5-9bba-4b14bdbd9277
Gallop, S.L.
c14133fc-9141-47d9-ae9c-84c2513ea8ad
van de Lageweg, W.I.
56b3c655-1466-4cf9-8b9e-fa8dd29d5edd
Coco, G.
2fd53078-aedb-4f12-bb28-d69b74d8ad64

Bryan, K.R., Gallop, S.L., van de Lageweg, W.I. and Coco, G. (2009) Observations of rip channels, sandbar-shoreline coupling and beach rotation at Tairua beach, New Zealand. In Coasts and Ports 2009: In a Dynamic Environment. Engineers Australia. pp. 270-275 .

Record type: Conference or Workshop Item (Paper)

Abstract

Interannual wave climate variations along the north east coast of New Zealand have caused significant changes to the erosional state of many of the popular tourist beaches. These changes threaten property, ruin expensive and labour-intensive dune plantings and destabilise walkways. The alongshore spatial and temporal variation of erosion can, however, not always be directly dependant on the variability in the wave climate. The response appears to be dependant on the alongshore extent of the beach and the existence of headlands. This work takes a 3.4 year data-base of rip channel location, sandbar position and shoreline position to quantify the patterns that occur on a headland-controlled embayed beach. Findings show that when wave events had a strong alongshore component, the alongshore bar and shoreline rotated and three dominant, persistent, rip channels developed on the end of the beach at which both the shoreline and barline were more seaward. This pattern where the beach rotated in one direction occurred on three occasions: at the beginning of the dataset (early 1999), during the persistent small storms during the winter of 2000, and in the other direction during the large storm in mid 2001. The rotation events were clearly related to the dominance of northward versus southward alongshore flux events over 3500 J/m2. These results show that on embayed beaches, the alongshore wave energy flux is pivotal in controlling shoreline erosion and the severity and location of rip channels.

Full text not available from this repository.

More information

Published date: 2009
Venue - Dates: conference; nz; 2009-09-14; 2009-09-18, New Zealand, 2009-09-14 - 2009-09-18
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 349719
URI: https://eprints.soton.ac.uk/id/eprint/349719
PURE UUID: 0a5212b9-156b-4d56-81a0-8bea37a6efda

Catalogue record

Date deposited: 08 Mar 2013 11:46
Last modified: 18 Jul 2017 04:39

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