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MARLBOROUGH DISTRICT COUNCIL He körero no te Kaunihera o Wairau Sounds News in Charting a course for a real-time navigation aid in the Sounds Tory Channel/Kura te Au, the main trunk line for ferries travelling between the North and South islands, has long had a reputation amongst mariners as a complex waterway. Work on a novel solution to the navigetional challenges the chennel presents is well underway, in conjunction with Morborough District Council The project wis result in real-time guidance for nevigators including ship masters, marine pilots and recrestional boaties on ectual curent conditions in the channet and Queen Choriotte Sound/Totoranul Council's Nautical and Coastal Manager, former Harbourmaster Luke Grogan, presented the research at a recent meeting of the Emvironment Commitee Captain Grogan and his team have been working on the project for more than a yoor in conjunction with marine and oceanographic survey experts Oceanum, Calypso Science and Xblue. He delivered the findings to the Australasian Coasts and Ports Conterence in earty Apri with a presentation titled 'Real time prediction of sdal and non-tidal flows to improve the navigational safety at the entrance to the Tory Channel. New Zealand: "This work is a significant advance towards understonding tides and currents in the Morborough Sounds and is an innovative opproach to unravelling these infuences for any coastal region in a broader sense," Captain Grogan said The research uses real-time tidal and gradient observations via new tide stations at two sites in Tory Channel- Te Weka Bay and Okukari Bay - and one site at Motuara island in Queen Charlotte Sound. This data has then been integrated with a hydrodynamic model simulation of the Sounds to "nowcast" and "forecast" curents, he said "This work has onty been possible in the Sounds because of Council's investment in the 2016 mutibeam survey of Queen Charlotte Sound. We were eble to draw on the information about tides gathened over a three-month period during this research," Captain Grogan said. A validation process is now underway following guidance from Land Information New Zealand and co-operation trom both ferry companies who will have computers on ships continuously collecting data to assess, inform and improve the model "This collaboration will ensure we can confirm sutficient confidence in the data across our key stakeholders and help us chart a course for the data to be made more widely avaleble to inform safe navigation"Captain Grogan said. The project has been partly funded with $250.000 received from KwiRail, given to the Council es port of an 'enforceable undertaking' imposed on the ferry service following an accident on the Kaiarahi interisiander ferry in April 2019. "The strong currents and turbulent flows that characterise the entrance to Tory Channet ore a well-known challenge to shipping." Captain Grogan said. "t's a complex and chalenging waterway and there is a need to take it seriously, particularty when we are looking at the arrival of new, bigger ferries in a few yors time." "We know that published current and tide predictions do not always align with what is experienced in Tory Channet This means that mariners cannot be certain of the conditions when they arrive. he said. In the past 20 years there have been at least five serious groundings or neargrounding incidents at the chennel entrance involving a large ferry or other type of ship. The most recent was the cruise ship Azamara Quest in January 2016 "Without exception, in ali cases, cuments or more specifically the complexity of curents, were a major fector in these incidents," Captain Grogan told the committee. "It we can create a system of real sime monitoring of cursents at the entrance this would be an important risk mitigation measure. It will give us ah evidence-based approach to navigational satety.: he said. Solar Power System AIS + Cellular communication systems Tide Siation Enclosure Redar Sensor Pole with Pressure Sensor Svong cuments ond turbulere fows thot chorocterse me Tory Chonnel entronce ore o well anoun cholenge to shoping The new tde stonons wit be locoted or nHO sites in Tory Chonnel- Te Weko Boy ond Okukori Boy ond one site ot Monoro islona in Queen Choriotte Sound Council's Harbours team - working to ensure our waterways are safe for everyone to enjoy. Contact the Harbourmaster's Office if you need advice or information about Mariborough's harbours. 03 520 7400 | HARBOURS aMARLBOROUGH.GOVT. NZ www.MARLBOROUGH.GOVT.NZ I 03 520 7400 I 15 SEYMOUR STREET, BLENHEIM, 7201 NEW ZEALAND MARLBOROUGH DISTRICT COUNCIL He körero no te Kaunihera o Wairau Sounds News in Charting a course for a real-time navigation aid in the Sounds Tory Channel/Kura te Au, the main trunk line for ferries travelling between the North and South islands, has long had a reputation amongst mariners as a complex waterway. Work on a novel solution to the navigetional challenges the chennel presents is well underway, in conjunction with Morborough District Council The project wis result in real-time guidance for nevigators including ship masters, marine pilots and recrestional boaties on ectual curent conditions in the channet and Queen Choriotte Sound/Totoranul Council's Nautical and Coastal Manager, former Harbourmaster Luke Grogan, presented the research at a recent meeting of the Emvironment Commitee Captain Grogan and his team have been working on the project for more than a yoor in conjunction with marine and oceanographic survey experts Oceanum, Calypso Science and Xblue. He delivered the findings to the Australasian Coasts and Ports Conterence in earty Apri with a presentation titled 'Real time prediction of sdal and non-tidal flows to improve the navigational safety at the entrance to the Tory Channel. New Zealand: "This work is a significant advance towards understonding tides and currents in the Morborough Sounds and is an innovative opproach to unravelling these infuences for any coastal region in a broader sense," Captain Grogan said The research uses real-time tidal and gradient observations via new tide stations at two sites in Tory Channel- Te Weka Bay and Okukari Bay - and one site at Motuara island in Queen Charlotte Sound. This data has then been integrated with a hydrodynamic model simulation of the Sounds to "nowcast" and "forecast" curents, he said "This work has onty been possible in the Sounds because of Council's investment in the 2016 mutibeam survey of Queen Charlotte Sound. We were eble to draw on the information about tides gathened over a three-month period during this research," Captain Grogan said. A validation process is now underway following guidance from Land Information New Zealand and co-operation trom both ferry companies who will have computers on ships continuously collecting data to assess, inform and improve the model "This collaboration will ensure we can confirm sutficient confidence in the data across our key stakeholders and help us chart a course for the data to be made more widely avaleble to inform safe navigation"Captain Grogan said. The project has been partly funded with $250.000 received from KwiRail, given to the Council es port of an 'enforceable undertaking' imposed on the ferry service following an accident on the Kaiarahi interisiander ferry in April 2019. "The strong currents and turbulent flows that characterise the entrance to Tory Channet ore a well-known challenge to shipping." Captain Grogan said. "t's a complex and chalenging waterway and there is a need to take it seriously, particularty when we are looking at the arrival of new, bigger ferries in a few yors time." "We know that published current and tide predictions do not always align with what is experienced in Tory Channet This means that mariners cannot be certain of the conditions when they arrive. he said. In the past 20 years there have been at least five serious groundings or neargrounding incidents at the chennel entrance involving a large ferry or other type of ship. The most recent was the cruise ship Azamara Quest in January 2016 "Without exception, in ali cases, cuments or more specifically the complexity of curents, were a major fector in these incidents," Captain Grogan told the committee. "It we can create a system of real sime monitoring of cursents at the entrance this would be an important risk mitigation measure. It will give us ah evidence-based approach to navigational satety.: he said. Solar Power System AIS + Cellular communication systems Tide Siation Enclosure Redar Sensor Pole with Pressure Sensor Svong cuments ond turbulere fows thot chorocterse me Tory Chonnel entronce ore o well anoun cholenge to shoping The new tde stonons wit be locoted or nHO sites in Tory Chonnel- Te Weko Boy ond Okukori Boy ond one site ot Monoro islona in Queen Choriotte Sound Council's Harbours team - working to ensure our waterways are safe for everyone to enjoy. Contact the Harbourmaster's Office if you need advice or information about Mariborough's harbours. 03 520 7400 | HARBOURS aMARLBOROUGH.GOVT. NZ www.MARLBOROUGH.GOVT.NZ I 03 520 7400 I 15 SEYMOUR STREET, BLENHEIM, 7201 NEW ZEALAND