Main
Page

go to
Tropical Coastal
Queensland

activities


This is the Matthew Flinders

Coastal Landform Site,
part of Flinders 2002 Web


The 'Investigator'

SOUND

naval whistle

Beyond the South East    Site:  Tropical Coast  (Qld)


(flute playing tune 4)

   LANDFORM THEME:  Features of the northern coastline

The distinctive coastline of southeastern Australia could be regarded as ending at the sandy beaches of Township of 1770. South of this area, the coastlines are regarded as 'high energy'; largely sandy, with many prominent headland, and only relatively minor sections of fine sediments (i.e. mud). Beyond 1770 the coastline changes, with 'low energy' depositional environments of fine sediments becoming much more significant (while sandy stretches and coastal headlands are less important). The massive offshore feature, the Great Barrier Reef is largely responsible for these influences.

  FLINDERS THEME:  Exploring northern waters

   Matthew Flinders sailed the waters of northern Queensland on more than one occasion. While a young sailor in training under Captain Bligh, he first viewed the far northern waters and islands at the top of 'New South Wales' (Cape York Peninsula / Torres Strait) in Sep 1792. In 1802 he was following in the path of James Cook while on the second phase of the great circumnavigation voyage in Investigator. Aware of the risks of sailing in this area, he hoped to find a navigable channel through the reef to the open ocean. He visited far northern Australian waters for the third and final time on his return to England in the Cumberland (Oct 1803) after the drama of the shipwreck of the Porpoise and the subsequent rescue.



 

  The north tropical coast of Queensland is largely sheltered by the Great Barrier Reef; average wave energy is lower than along coastlines facing the open sea. As a result of this, fine sediments (mud and silt) can be deposited at the mouths of rivers and creeks, forming bars and islands, spreading along the coastline and settling in bays and inlets. In contrast, in higher energy coastal environments, much of the finer sediment is removed from the coastline through active erosion, and deposited further offshore.


Photo 1: Coastal river mouth, Tropical Qld


In extensive shallow areas these fine sediments, when above low tide level, can be colonised and stabilised by plants, especially mangroves, which form important fish and crustacean breeding grounds. Such areas also act as vital habitats for wading birds. Through this process of land extension a river delta may be built up; the Burdekin River has a well developed delta at its mouth. Many other rivers have built extensive river mouth deposits.



   Magnetic Island is almost completely made up of a single, large granite mass. The topography is quite hilly, rising to Mt Cook (506m). Typical granite features, including rounded boulders, exfoliated slabs and major jointing, are found on the island. 

As a result of weathering of softer minerals, the resistant quartz remains as coarse grains to form the bulk of the island's soil. The most common minerals of the Magnetic Island Granite are quartz, two forms of feldspar, and biotite. The Magnetic Island Granite is believed to have been intruded between 280-260 million years ago. 





Photo 2: Magnetic Island, from Townsville


Magnetic Island is adjacent to Townsville, the largest city of tropical Australia. It is separated from the mainland by a shallow water body about 5km wide. Some attractive beaches are located between rocky headlands. 



  
The coastal ranges reach down almost to the sea near Cairns. This confines the transport routes, settlements and agriculture into a narrow band in places,  while offering striking scenery. The mountains formed a considerable obstacle to coast-inland transport in earlier days. In addition, the mountains 'attract' a high annual rainfall through the orographic effect

   The steep topography, high rainfall, and dense vegetation made exploration and settlement difficult; however, these factors presently contribute to the ecological value of the region and offer considerable attractions to tourists, many of whom are seeking high quality ecological experiences or wilderness-based adventure.





Photo 3: Coastal landform and ranges, near Cairns




   One of several ways to travel to the Atherton Tableland, inland of Cairns, is by cablecar (Skyrail). Other ways are by train and road; all ways offer scenic views. The coastal plain here is narrow; sugar cane farms crowd the available fertile land. Most of the original coastal rainforest has been removed for agriculture.

The cablecar system was built in the 1990s, and was subject to very stringent environmental conditions - the area is part of the World Heritage listed Wet Tropics. The system allows the safe viewing of landscapes, as well as the tropical rainforest canopy from above. At the time of construction there was considerable opposition to the project on environmental grounds. 





Photo 4:  Barron River floodplain and adjacent features, near Cairns
(Skyrail cables and car visible)


When the nearby railway was originally constructed, hand tools were used, and working conditions were very harsh. Both railway and cablecar assist in reducing vehicular traffic on the escarpment roadway, which has grown considerably over recent years with increasing tourism to the region.  


SOUND 

frog sounds


   The highland areas adjacent to Cairns are readily visible from the sea. In particular, the Atherton Tableland is well known and offers numerous landform, ecological and cultural features of interest. Several locations will be mentioned briefly.


Photo A
 
Lake Barrine, a volcanic crater lake or maar, formed about 10,000 years ago when magma below the surface came into contact with ground water, initiating a series of violent explosions. 
Photo B
Curtain Fig Tree, growing on the fertile basaltic soil of the Tableland. 
Photo C
Rugged gorge of the Barron River, which drains the eastern Tableland. Hydro-electric power is generated here at the base of the escarpment.
Photo D
Barron Falls, where the river tumbles over the rugged escarpment of the Tableland. The river is shown in low flow conditions; in the wet season this view from here is very spectacular - a torrent instead of a trickle!



Photo 5: Atherton Tableland features (coastal hinterland)




Photo 6: Barron Falls under moderate flow conditions (Sep 2003)  [Photo by T.McPherson]




   Hinchinbrook Island is a spectacular land mass not far off the north Queensland coast. Most of the coastline of the island is made up of mangrove-covered mud flats. The interior consists of steep slopes, rising to 1121 metres at Mt Bowen. 

Hinchinbrook Channel runs left-right across the photo, in front of the island. The low-lying area in the foreground and middle distance are parts of the mainland built up by the deposition of fine sediments from the Herbert and Seymour Rivers, and the numerous creeks of the district. Mangrove forest covers these low-lying areas.

  
The island is unique in that it is entirely National Park, and therefore a protected environment. Visitation and overnight stays are carefully controlled. Some of the channel's islands and adjacent areas are also protected as fish habitat areas.





Photo 7: Hinchinbrook Channel and Hinchinbrook Island (in distance)
[Photo by T.McPherson]



SOUND 

Northern wet season sounds

 

 


go to
Tropical Coast
activities



(button picture: Barrier Reef themes)

Main Page



For further information


LANDFORM LINKS
Igneous Rocks are found along parts of the Tropical Coast
Basalt (eg. Atherton Tableland)      Granite (eg. Townsville)
Igneous Rock Classification
Salt (mineral produced along the N Qld coast)
General estuary information:
Estuary definition A
       Estuary definition B
Estuary forms       Estuary impacts & types
Rivers - nutrient loads and transport


ENVIRONMENTAL LINKS

Wet Tropics: World Heritage Area - A
Wet Tropics: World Heritage Area - B
Kidcyber: Taipan (snake)
Kidcyber: Cassowary (bird)
Kidcyber: Crocodile
Townsville: Biodiversity Protection Case Study
Jellyfish (Marine Stinger) Fatalities
Dr Peter Fenner - Marine Stingers



Printed Materials


White, M.E. - Running Down: Water in a Changing Land
Kangaroo Press, East Roseville NSW. 2000

Reader's Digest Guide to the Australian Coast
Reader's Digest Services, Surrey Hills NSW. 1983

Reader's Digest Scenic Wonders of Australia
 Reader's Digest, Surry Hills NSW. 1976

Bird, E.C.F.  Coasts: An Introduction to Systematic Geomorphology
ANU Press, Canberra. 1976 (& subsequent editions)

and  Matthew Flinders  Books


 


Site / Photos: (c) C.Grant 2002, 2003
(except where otherwise indicated)