During the full-water period, particle distribution was clearly
unimodal at the tail,with amode of 9–10 μm, whilst it became bimodal
in the littoral of the middle area, and more clearly at the dam, with
modes around 5 and 22 μm (Fig. 2). Desiccation during the low-water
period involved relatively moderate changes in the grain size distribution,
being the most clear the increase of the sand fraction in all the
sites, as well as the increase of the clay fraction at the river outlets (S1
to S3, and S11) (Table 2 and Fig. 2). Consequently, most of the grain
size distributions became bimodal (Fig. 2), whilst sorting significantly
increased for the samples taken in the low-water period (Table 2). However,
no clear effect of desiccation over xg was observed.