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The Leading Edge; September 2003; v. 22; no. 9; p. 865-870; DOI: 10.1190/1.1614159
© 2003 Society of Exploration Geophysicists
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GPR stratigraphy of a large active dune on Parengarenga Sandspit, New Zealand

Remke L. Van Dam

New Mexico Tech, Socorro, U.S.

Scott L. Nichol, Paul C. Augustinus, Kevin E. Parnell and Peter L. Hosking

The University of Auckland, New Zealand

Roger F. McLean

Australian Defense Force Academy, Canberra, Australia

Corresponding author: rvd@nmt.edu

The first 20% of the full text of this article appears below.

The Parengarenga Sandspit (Figure 1) is New Zealand's only coastal source of silica sand for glass manufacturing. Concerns about the environmental effects of sand extraction from the harbor mouth in the last two decades led the extraction companies to instigate a monitoring program. The Parengarenga beach-dune-monitoring program started in 1982; since that time cross-profiles have been surveyed twice a year from below chart datum (CD) to landward of the sparsely vegetated foredune system. This is the longest continuous record of beach profile measurement in New Zealand, and provides important information on the behavior of this coastal spit system (Parnell, 1997). The sedimentary material in Parengarenga Sandspit consists of 93.5% quartz and has a very uniform fine, sandy grain size (median 193 microns) from near shore to the beach and in the dunes.


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  		Figure 1. Maps showing the location of Parengarenga Harbour in New Zealand.

 
The interior of the spit is characterized by several solitary, unvegetated dunes separated by flat sparsely vegetated interdune areas (Figure 2). The solitary dunes, with the dominant morphology of star dunes, were not originally incorporated into the monitoring program, as it was not part of the aim of the survey and their variability was considered small (time scales of a few years). However, the longer the program is maintained, the larger the role of the inland dunes as sediment source or sinks may become. The dominant wind direction in New Zealand's Far North is from the southwest to south (Figure 3), which explains the presence of the largest eolian dunes on the windward west coast. Parengarenga Sandspit is on the leeward side of the island, where strong secondary winds from the east-northeast interfere with the dominant winds from the southwest (Figure 3) and sector the driving force for coastal dune . . . [Full Text of this Article]




This article has been cited by other articles:


Home page
 Geological Society of America Special PapersHome page
C.H. Hugenholtz, B.J. Moorman, and S.A. Wolfe
Ground penetrating radar (GPR) imaging of the internal structure of an active parabolic sand dune
Geological Society of America Special Papers, January 1, 2007; 432(0): 35 - 45.
[Abstract] [Full Text] [PDF]


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