Orewa beach: Stage II beach nourishment proposal by Rodney County Council / R.K. Smith

By: Smith, R.K.
Contributor(s): Bell, R.G. (NIWA. Hamilton) | Water Quality Centre (Hamilton, N.Z.).
Series: Internal report / Water Quality Centre, Hamilton: no. 86/22Publisher: Hamilton, N.Z. : Hamilton Science Centre, 1986Description: 11 leaves : illustrations, graphs ; 30 cm.Report number: HPW-IR--86/22Subject(s): OREWA | SAND MINING | EXTRACTION | BEACH EROSION | NEW ZEALAND | WATER QUALITY In: Internal report / Water Quality Centre, HamiltonSummary: The proposal for extracting 18,000m3 of sand from Orewa Estuary and the placing of it on the central 1000 m of Orewa Beach foreshore is examined. The grain size of the estuary material is suitable for use as nourishment material. Recent beach erosion history at Orewa suggests that the beach is eroding in the central section in an attempt to develop a plan curvature typical of a zero transport beach. Deposition of sand in the central part of the beach without building up the ends may aggravate the situation and cause erosion of the nourishment material. A plan for nourishment should include placing sufficient sediment on the ends of the beach to allow a curved beach form to develop seaward of the present rock wall in the centre of the beach.
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JOURNAL JOURNAL WELLINGTON
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STACK NO. 86/22 1 Available J018077

The proposal for extracting 18,000m3 of sand from Orewa Estuary and the placing of it on the central 1000 m of Orewa Beach foreshore is examined. The grain size of the estuary material is suitable for use as nourishment material. Recent beach erosion history at Orewa suggests that the beach is eroding in the central section in an attempt to develop a plan curvature typical of a zero transport beach. Deposition of sand in the central part of the beach without building up the ends may aggravate the situation and cause erosion of the nourishment material. A plan for nourishment should include placing sufficient sediment on the ends of the beach to allow a curved beach form to develop seaward of the present rock wall in the centre of the beach.

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