Next Article in Journal
Subsidence Trends of Volturno River Coastal Plain (Northern Campania, Southern Italy) Inferred by SAR Interferometry Data
Next Article in Special Issue
A Bathymetry- and Reflectivity-Based Approach for Seafloor Segmentation
Previous Article in Journal
Groundwater Natural Contamination by Toluene in Beja and Faro Districts, Portugal
Previous Article in Special Issue
The Morphometry of the Deep-Water Sinuous Mendocino Channel and the Immediate Environs, Northeastern Pacific Ocean
Open AccessArticle

Development of a Seamless, High-Resolution Bathymetric Model to Compare Reef Morphology around the Subtropical Island Shelves of Lord Howe Island and Balls Pyramid, Southwest Pacific Ocean

1
School of Earth and Environmental Sciences, University of Wollongong, Northfields Ave., Gwynneville 2522, Australia
2
Geoscience Australia, GPO Box 378, Canberra 2601, Australia
3
New South Wales Department of Primary Industries, Locked Bag 1, Nelson Bay 2315, Australia
*
Author to whom correspondence should be addressed.
Current address: Water, Wetlands and Coasts Science, New South Wales Office of Environment and Heritage, Locked Bag 1002, Dangar NSW 2309, Australia.
Geosciences 2018, 8(1), 11; https://doi.org/10.3390/geosciences8010011
Received: 3 November 2017 / Revised: 20 December 2017 / Accepted: 23 December 2017 / Published: 2 January 2018
(This article belongs to the Special Issue Marine Geomorphometry)
Lord Howe Island and Balls Pyramid are located approximately 600 km offshore of the southeastern Australian mainland, in the subtropical waters of the northern Tasman Sea. Lord Howe Island hosts the most southern coral reef in the Pacific Ocean, and the shelves surrounding both islands feature fossil coral reefs. This study creates a seamless, high-resolution (5 m cell size) bathymetry model of the two shelves to compare and contrast the extent of reef development and shelf morphology. This was produced by integrating satellite-derived depth data (derived to 35 m depth) and multibeam echosounder (MBES) data. Image partitioning and filtering improved the accuracy of the bathymetry estimates and the suitability for integration with MBES data. Diverse accretionary and erosional geomorphic features were mapped on both shelves, with fossil reefs dominating the shelves in 25–50 m depth. Similar patterns of shelf morphology were observed for the middle and outer shelves, while the inner shelf regions were most dissimilar, with reef development greater around Lord Howe Island compared to the more restricted inner shelf reefs around Balls Pyramid. Understanding the relative extent and morphology of shelf features provides insights into the geological and ecological processes that have influenced the formation of the shelves. View Full-Text
Keywords: bathymetry; DEM; satellite imagery; multi beam echosounder; filter; geomorphology; coral reefs bathymetry; DEM; satellite imagery; multi beam echosounder; filter; geomorphology; coral reefs
Show Figures

Figure 1

MDPI and ACS Style

Linklater, M.; Hamylton, S.M.; Brooke, B.P.; Nichol, S.L.; Jordan, A.R.; Woodroffe, C.D. Development of a Seamless, High-Resolution Bathymetric Model to Compare Reef Morphology around the Subtropical Island Shelves of Lord Howe Island and Balls Pyramid, Southwest Pacific Ocean. Geosciences 2018, 8, 11.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop