Kettle Creek exhibited a 1-1.3 m depth throughout the center, grading to 0 0.3 m depth around its perimeter. Figure 4 illustrates the distribution of mean grain sizes throughout Kettle Creek and Silver Bay. Coarser sands are located near the bay mouth, in the range of 0.5 F . Further, there are occasional relic sediments which are part of the older drowned topography. The spatial distribution of standard deviations of the individual sediment samples throughout both micro-estuaries is shown in Figure 5.
Fluvial input occurs in areas of groundwater flow, where rivers and streams feed the bay.
Fluvial input is a low energy formational process that is generally responsible for bringing in silts and other fine particles into the micro-estuary. The convergence of the two processes mixes the two sediment types. Figure 6 is a plot of standard deviation versus mean grain size of our sampling points. Bay mouth barrier samples of 0-2 F mean grain size show the best grouping, with standard deviations centered between 0.5 and 1.25. Deep fluvial sediments of 4-6 F show the next best grouping, with a standard deviation centered between 1 and 2.