Assessing shoreline change at the Cape Jaffa Marina SE South Australia

Mr Marcio Dasilva1

1Flinders University, Plympton Park, Australia

The coastal zone is a dynamic area which can experience substantial change in short time periods that can be associated with weather events and with more substantial long-term morphological trends. The monitoring of shoreline change represents a significant area of interest for coastal communities and management programs responsible for its preservation. This  presentation provides a case study focused around the Cape Jaffa Marina in South Australia, assessing shoreline change associated with a constructed canal estate and adjacent coast. The research  a comprises a GIS based analysis of shoreline change utilising (i) aerial imagery collected by the State Government of South Australia prior to construction, (ii) satellite imagery collected by the Planetscope satellite system to assess the decade since construction, and, (iii) Unmanned Aerial Vehicle (UAV) surveys to assess localised morphological change. The shoreline change was assessed in the Digital Shoreline Analysis System (DSAS) extension of ESRI’s ArcGIS (2019) to provide statistics of the rates of change of the past two decades. Five separate UAV surveys provide the data for Structure from Motion (SfM) photogrammetry and the creation of high-resolution Digital Surface Models (DSMs) to evaluate morphological change over time around the Cape Jaffa Marina from August 2018 to September 2019. The results provide a case study of an accreting sandy coastline experiencing substantial amounts of sediment transport, the corresponding barrier effects of coastal infrastructure, and the resulting significant morphological changes to the Cape Jaffa shoreline.


Biography:

Marcio DaSilva is working on finishing his Masters of Geospatial Information Science at Flinders University, due to graduate at the end of 2019. He will submit 2 papers for publication based on his research on shoreline change at Cape Jaffa to fulfil the requirements of his Masters degree. Marcio has connected his background in geography and environmental science with the academic staff working with Coastal Management issues at Flinders University. He sees the coastline as an area of utmost importance of study and understanding as the effects of a changing climate manifest.

Development of coastal transgressive dunefields in South Australia

Dr Graziela Miot Da Silva1, Dr Patrick A Hesp1

1Flinders University, Bedford Park, Australa

The degree, or extent and volume of coastal dunefield development has been frequently attributed to sediment supply and exposure to onshore/alongshore winds above the threshold to initiate sediment transport. Short and Hesp (1984) and Short (1988) argue that in South Australia, where terrigenous sediment supply is very limited, waves are a dominant control in Holocene dunefield development by transporting sediments from the shelf to a degree proportional to their energy. This study is a contribution to this discussion by testing the wind and wave control in dunefield development in a variety of environmental settings across South Australia. Wind data (speed and direction) were obtained from the Bureau of Meteorology for 23 stations along the open and Gulf coastlines of SA. Reanalysis products were also used to fill in spatial gaps in wind measurements. Dunefield dimensions, embayment indentation and exposure to waves were analyzed via ArcMap 10.3.1 using 1 meter resolution Digital Globe imagery. Nearshore bathymetry data compiled by Geoscience Australia was utilised to calculate nearshore slopes from the shoreline to 20 meters water depth. Results show that the biggest dunefields do not correlate with the strongest winds, similarly, areas that experience high aeolian drift potential don’t display large dunefields. In South Australia, the nearshore slope, exposure to waves and winds as well as the average indentation of embayments interplay to produce duenfields of varied sizes, where the largest dunefields occur in coastal areas fully exposed to waves and winds, adjacent to steep nearshore slopes and with open embayments.


Biography:

Bio to come

Integrating innovative technologies for automated hydrography

Mr Mick Hawkins

Fugro Australia Marine Pty Ltd, Kidman Park, Australia

Understanding our ocean environment and the production of nautical charts for the safety of navigation has long been the key role of hydrographers.  Whilst the requirement for this role has not changed for hundreds of years, there is a growing a need for up to date information for not only hydrography, but to also to help sustainably manage the seas and marine resources, and protection our coastal infrastructure.  Hydrographic and oceanographic information is constantly being called upon to help manage the challenges of climate change and urbanization in coastal communities.

Emerging innovations see data collection becoming increasingly autonomous with missions being undertaken over vast areas and detected features being automatically identified.  In the near future data collected will be transferred in close to real time to a cloud environment.   Techniques to process the data will be increasingly automated with the use complex algorithms and Artificial Intelligence is now emerging.

As the need for information is increasing, the technologies used for data collection are increasingly innovative. The data collected once, is now used many times. Fugro is pioneering in this future and helping to ensure the hydrographic community will continue to have the capability to play a role in managing the environment and resources to contribute to a liveable world.

This presentation will look at the development, integration and implementation of Fugro’s innovative new approaches to hydrographic data collection utilising remotely operated and/or autonomous vessels and drones, automated data processing and how they have proven to provide benefits to the industry.


Biography:

Hugh Parker is a hydrographic Surveyor and the Product Owner for Fugro’s Unmanned Surface Vehicle (USV) for hydrographic services. Hugh graduated from the University of South Australia with a Degree in Geoinformatics and Surveying, began working with Fugro as a surveyor, undertaking hydrographic surveys worldwide using Airborne LiDAR Bathymetry technology in 2001.  In 2007, Hugh undertook and completed his post graduate diploma in the FIG/IHO Category A certified course specialising in Hydrographic Surveying at the University of Otago in New Zealand.  Following this, Hugh then managed hydrographic surveys for Fugro in Europe, Australia and the Middle East. Hugh has also had roles in Fugro’s Business Development Manager for Hydrographic Survey services, prior to his role as the Product Owner for Fugro’s Autonomous Surveyor solution.

Alkaline earth metal isotopes as a novel tool to constrain water sources and changes in carbonate precipitation in the lagoon-estuarine environments

Ms Yuexiao Shao1, Dr Juraj Farkaš1, Prof Luke Mosley1, Mr Henri Wong2, Dr Moneesha Samanta3, Dr Jonathan Tyler1, Prof Chris Holmden4, Prof Bronwyn Gillanders1, Ms Ana Kolevica5, Prof Anton  Eisenhauer5

1University of Adelaide, Adelaide, Australia, 2ANSTO, Sydney, Australia, 3Australian National University, Canberra, Australia, 4University of Saskatchewan, Saskatoon, Canada, 5GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr, Germany

Coastal environments, including lagoon-estuarine systems, represent a land-ocean interface whose physico-chemical properties are sensitive indicators of climate change and anthropogenic perturbations. These environments typically involve dynamic hydrological and geochemical processes and water mixing phenomena, resulting in large gradients in salinity, mineral saturation state and chemical/isotope composition of local waters. In turn, these parameters are critical for calcium carbonate (CaCO3) cycling in coastal waters, which is an important but currently poorly constrained component of the global carbon cycle and often concerned in “blue carbon” studies. In order to understand these coastal processes, we calibrate novel isotope tracers of alkaline earth metals, specifically stable strontium (δ88/86Sr) and calcium (δ44/40Ca) isotope tracers based on analyses in water and carbonate samples from the Coorong, Lower Lakes and Murray Mouth Estuary – an unique hydrological system in South Australia with large water salinity gradient ranging from fresh to hypersaline (from ~0 to over 100PSU). Preliminary results show a correlation between δ88/86Sr and δ44/40Ca, both of which show a systematically increasing trend with increasing salinity, complemented by increasing water carbonate saturation. Furthermore, this multi-proxy isotope approach can also be used to constrain water source mixing and changes in carbonate formation/dissolution in coastal systems, where the latter is relevant to blue carbon cycle and particularly its inorganic C or carbonate (CaCO3) component.


Biography:

I have started my PhD at University of Adelaide since August 2017, with particular interest in biogeochemistry and non-traditional isotopes (e.g. Sr and Ca isotopes) and application of these tracers to constrain hydrological/geochemical variability in coastal environments, such as changes in water source inputs, salinity, and carbonate fluxes controlled by evaporation or biological processes. Furthermore, these tracers are explored for reconstruction of paleo-environments. Personally, I love travelling, seeing different nature and cultures, it has taught me to think in various ways, and to respect and appreciate the environments and resources given by our incredible planet.

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