Tidal Flat Salinity Gradient, Figure 3 Salinity of groundwater across two transects of a tropical macrotidal tidal flat from the Lawley
River delta of northwestern Australia (modified from Semeniuk, 1983). Along both transects, the salinity of the groundwater markedly
increases from the level of mean high water neap tide (MHWN) to the level of the highest astronomical tide (HAT). Transect 1 is in an
area with minimal freshwater seepage. Transect 2 is in an area with marked freshwater seepage, and as such, hypersalinity of
groundwater is diluted along the hinterland edge.
Tidal Flat Salinity Gradient, Figure 2 Salinity of groundwater and pellicular water across a tropical tidal flat in northwestern
Australia. The salinity of the groundwater and pellicular increases from the low-tidal zone to the high-tidal zone, with the
groundwater being of a slightly higher salinity than the pellicular water. There is no freshwater seepage in this location, and so
the hypersalinity of the high-tidal flats is not diluted (compare with high-tidal salinity in Figures 3 and 4).
TIDAL FLAT SALINITY GRADIENT
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