Channel geometry was determined from high resolution RTK GPS digital elevation data obtained by Dr. C. Alexander at Skidaway Institute. The Groves Creek digital elevation model has been described in Sullivan et al. 2015 & 2019. To obtain channel profiles, a transect normal to the channel and intersecting the ADP deployment location was established, and the NAVD88 elevations at 0.5-1m intervals along that transect were then estimated from the elevation data set.
Transect endpoints were determined visually from maps. Data shown in bold in the original Excel file (see Data Files section) have been arbitrarily assigned to ensure that the trapezoids obtained for integration of total cross sectional area have a flat top.
This dataset was extracted from the complete digital elevation model for the Groves Creek marsh by C. Alexander (SkIO) [see Supplemental Files], where single-beam data was collected during 23 survey missions between 2010 and 2011 from a small shallow draft electric boat around high tide using an Ohmex Sonarmite echosounder with RTK-GPS positioning. Pedestrian RTK-GPS survey data was collected across the low gradient marsh platforms, creek levees, and throughout creeks found to be too small or shallow for the survey boat. Pedestrian data was acquired during times around low tide using Trimble R6 GPS receivers with RTK correction data obtained through a Virtual Reference System. Location is reported as 31.96667, -81.01667.
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