An assessment of variation in beach volumes is needed to better understand beach behaviour and to monitor changes in an attempt to manage beach volume distribution through targeted intervention. Mixed sand and gravel beaches, as well as gravel beaches, are distinct from sandy beaches in that they often have multiple steep (>20° or 1 : 4) berms on the upper part of the beach and short-wavelength (<20 m) longshore variations in the form of beach cusps or in close proximity to groynes. This paper discusses a range of ground survey and remote sensing methods for surveying mixed beaches, methods of point collection in relation to the different methods, and subsequent interpolation to calculate beach volumes. Particular emphasis is given to high-density surveys by Global Positioning System (GPS) with a rover attached to a wheel. Results show that average surface elevation changes greater than ±0.04 m can be reliably detected and that the method, if carried out using cross-shore profiles, provides a useful tool for beach monitoring in scientific projects interested in inferring processes from the surveys and that have a temporal resolution from tides to weeks. For surveys predominantly interested in monitoring total beach volume, GPS surveys with a quad bike (all-terrain vehicle) might be more economical while providing only marginally poorer results if surveys coincide with minimum cross-shore variation during spring tide. Comparisons between ground surveys with GPS and remote sensing methods like LIDAR or airborne photogrammetry are also discussed.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 2010 • No. 263