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·
Mean
size (Folk & Ward,
1957; Weydert, 1971) : the
following indices give the degree of
homogeneity of a sediment.
·
The
size range (Rivière,
1952) is based on the size of the largest and
smallest particles. The larger the number of
different-sized particles constituting a sediment, the
greater the
value of this index will be.
·
The classification
index (Krumbein,
1936) add
a selective particle sorting process, whereby the shapes
and sizes of the particles depend on
the hydrodynamic conditions.
·
The
normality of
distributions Folk & Ward, 1957;
Kurtosis) is another classification index. The higher the
values obtained and the narrower the frequency
histograms tend to be, the easier it will be to classify
the particles on this basis.
·
The
sorting index (Folk &
Ward, 1957) is another classification index, which can
be used to assess the relative contribution of either
the coarse or the fine granular components.
·
The
skewness
(Folk & Ward, 1957) is positive if the coarse
components predominate, otherwise it is negative.
·
The
hydrodynamic factor (Weydert,
1973) characterises the transportability of the sediment
under consideration. Positive values characterise
sediments liable to be transported, and negative values
characterise stable, rather immobile sediments.
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