A field based classification scheme for gravel beaches

Jennings, R and Shulmeister, J (2002) A field based classification scheme for gravel beaches. Marine Geology, 186 3-4: 211-228. doi:10.1016/S0025-3227(02)00314-6

Author Jennings, R
Shulmeister, J
Title A field based classification scheme for gravel beaches
Journal name Marine Geology   Check publisher's open access policy
ISSN 0025-3227
Publication date 2002-07-10
Sub-type Article (original research)
DOI 10.1016/S0025-3227(02)00314-6
Volume 186
Issue 3-4
Start page 211
End page 228
Total pages 18
Language eng
Subject 1906 Geochemistry and Petrology
1907 Geology
1908 Geophysics
Abstract A tripartite classification of gravel beaches, based upon morphodynamic properties, is proposed and demonstrated for 42 New Zealand beaches. The main advantage of this scheme is that it is based on simple visual classification that can be applied globally in the field and is underpinned by morphodynamic differences between the beach types. The three types identified from the results are: (1) pure gravel beach; (2) mixed sand and gravel beach; (3) composite gravel beach. Pure gravel beaches have steep slopes (tan β = 0.08-0,24) and gravels extending from the storm berm to below mean low water spring tide level. Mixed sand and gravel beaches have moderate slopes (tan β = 0.04-0.13) with sand and gravel entirely mixed both cross-shore and at depth. Composite gravel beaches have a steep gravel berm fronted by a low-angle intertidal terrace, with overall beach slopes of tan β = 0.05-0.14. On composite beaches there is distinct hydrodynamic cross-shore sorting of the sand and gravel component. These broad types are tested using discriminant analysis and the three classes are shown to be highly significant (F= 16.24, df=8, P<0.00005). The key discriminating variables are Iribarren number, beach width, average grain size and storm berm height.
Keyword Beach
New Zealand
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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