1978/12/01 by Jeremy Gibb · 1 citation
Earth and Planetary Sciences · Environmental Science · #Coastal and Marine Dynamics #Coastal wetland ecosystem dynamics #Geology and Paleoclimatology Research #Accretion (finance) #Shore #Cliff #Geology #Erosion #Coastal erosion #Hydrology (agriculture) #Physical geography #Geomorphology #Oceanography #Geography #Paleontology
paper · pdf · doi:10.1080/00288330.1978.9515770
openalex publication_date 1978/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abstract Rates of coastal erosion and accretion for New Zealand are calculated for the period since early European colonisation. Methods used for calculating rates from cadastral plans, vertical aerial photographs and field measurements are described, evaluated, and illustrated with examples. The most natural reference line for measurements of shoreline changes and for defining the seaward boundary of land is the seaward limit of land vegetation. Measurements made from air photographs and plans at scales larger than 1:4000 have errors less than ± 1 m. As scales become small, errors increase proportionately. Along depositional shorelines, erosion and accretion generally occur at 0.5–4.0 m.y −1 . Maximum erosion and accretion rates are 25.4 m.y −1 at North Kaipara Head and 68.9 m.y −1 at Farewell Spit respectively. Cliff recession generally occurs at 0.25 ‐ 1.0 m.y −1 with maximum rates of 2.25 m.y −1 for mudstone cliffs at Cape Tumagain and 3.46 m.y −1 for conglomerate cliffs at Ngapotiki.