How did you decide where a Riverine wetland ends and an Estuarine wetland begins?
The primary mechanism used to distinguish between systems influenced by tidal salinity (Estuarine and Marine) and those not influenced by tidal salinity (Riverine, Palustrine and Lacustrine) is water sampling to determine where salinity drops below 5ppt. However, as the Queensland Wetlands Program Wetland Mapping is compiled remotely using existing data, it is necessary to use mapping surrogates. Where the cut-off between saline and fresh water is across a channel, the surrogates used to determine the mean high water springs (MHWS) were the presence of a barrier such as a barrage or weir, or the line between estuarine and non-estuarine vegetation. Where the cut-off is outside a channel, the surrogate used to determine the highest astronomical tide (HAT) was the boundary between estuarine and other types of vegetation or water. For more information go to Wetland Mapping and Classification Methodology.
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