The EOF analysis of beach profiles at all four sites reveals that more
than 90% of the data variation is captured by the first five
eigenfunctions. Therefore, only the first five eigenfunctions will be
used to describe the beach profile change phenomena.We will first investigate
spatial empirical orthogonal functions (SEOF). The first spatial
eigenfunction (SEOF1) at all sites reflect the mean profile (thick black
line in Fig. 7). The primary vertical axis in Fig. 7 corresponds to second
and subsequent eigenfunctions while secondary vertical axis corresponds
to the first eigenfunction.