Shoreline Management Plan Erosion and Inundation Hazard Maps

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Shoreline Management Plan Erosion and Inundation Hazard Maps

Attachment A Shoreline Management Plan Committee 15 March 2021 Comprehensive Report: Shoreline Management Plan Erosion and Inundation Hazard Maps 1 Background Coastal inundation is caused by sea levels increasing as a result of a number of oceanic processes which occur over both short time frames (hours to days), e.g. tides and storms, and long time frames, e.g. sea level rise. The different components of measured sea level include predicted astronomic tide, storm surge and sea level anomoly (see Figure 1). These processes vary between the Coromandel Peninsula’s east coast, that faces the Pacific Ocean, and west coast, within the Hauraki Gulf/Firth of Thames. Figure 1 The components of coastal inundation considered in the modelling Figure 2 The components of coastal erosion considered in the modelling 2 Discussion 2.1 Coastal Erosion Maps Coastal erosion maps have been produced for the following high risk locations for 2020, 2040, 2070 and 2120 (link to maps included in Attachment 1): For Thames Coast – Tararu, Te Puru, Whakatete Bay, Ngarimu Bay, Waoimu, Tapu, Te Mata, Waikawau and Kereta. For Coromandel to Kennedy Bay Coast – Papa Aroha, Oamaru, Colville and Kennedy Bay. For Whangapoua Harbour and Mercury Bay Coast – Whangapoua, Matarangi, Wharekaho, Buffalo Beach and Cooks Beach. For the South East Coast – Tairua, Pauanui and Whangamata. Some further modelling is proposed to provide more detailed information for Tararu, Te Puru, Colville, Buffalo beach and Whangamata South. Other areas of investigation should include Amodeo Bay/Waitete Bay. 2.2 Coastal Inundation Maps Coastal inundation maps have been produced for the following high risk locations (link to maps included in Attachment 1): For Thames Coast – Kopu, Thames, Tararu, Te Puru and Tapu. For Coromandel to Kennedy Bay Coast – Coromandel and Colville. For Whangapoua Harbour and Mercury Bay Coast – Whangapoua and Whangapoua Harbour, Matarangi, Whitianga and Cooks Beach. For South East Coast – Tairua Harbour and Whangamata. Further modelling is proposed to provide coastal inundation hazard lines in 20cm sea level rise increments to 1.4m for 1% (100-year) and 5% (20-year) AEP storm events and for king tide events. This will provide data on the likely increased frequency of flooding. Attachment 1 – Link to DRAFT Coastal Erosion and Inundation Maps https://www.tcdc.govt.nz/Your-Council/Council-Projects/Current-Projects/Coastal- Management/Shoreline-Management-Plans/.

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A Showy Lily (Lilium Formosanum) on the Move?
7 produced in its turn a mature form rosette with only 5 leaves a much smaller plant than that produced by the 5 mm tuber at the beginning of the study. This was in fact its last gasp. No new tuber formed and the plant died. The pollination mechanism is insect attractive but on some sites notably the western and southern coastal aspects of the Waitakere Ranges the plants are subjected to severe wind buffeting which is more than enough to shake the pollinia loose and deposit some grains on the stigma. Be this as it may all the flowering plants I observed set s e e d . REFERENCES Hatch E.D. 1949 Trans. R.S.N.Z. 77: p. 238. 1971 Auck. Bot. Soc. Newsletter Nov. p. 5. 1984 Auck. Bot. Soc. Newsletter 39: Jan. p.18. Received 5 August 1986 A SHOWY LILY (LILIUM FORMOSANUM) ON THE MOVE? E.K. Cameron In mid February 1986 on the Coromandel Peninsula I was struck by the showy roadside and sand dune weed Formosa lily (Lilium formosanum). It was present from the eastern end of the Kopu Hikuai Road north to Cooks Beach (just south of Whitianga) being more common north of Tairua. Along the highway it was growing in roadside gravel usually in small groups of separate plants many kilometres apart. On the sand dunes at Cooks and Hotwater Beaches the lilies were locally abundant and often close together. Flowering stems were about 0.5 m tall (sand dune plants up to 1 m) and had l 2 (4) horizontally held slender funnel shaped flowers 14 18 cm long; making it one of N.Z.s longest flowered wild plants.
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