Is your modeling accuracy hampered by limited bathymetric data?
Inaccurate or incomplete data will impair stream modeling accuracy. Trutta is experienced in collecting high-quality cross-sectional transect and bathymetric data over long stretches of water of all sizes. Combining this data with HDSS video footage and other data documented in an HDSS assessment expands modeling capababilities and accuracy.
Transect data are plotted in ArcGIS to identify the cross-section points from HDSS longitudinal points. A line is created through the points and the points are snapped to the line. The cross-sectional data are then assembled with an ID (referring to the river mile), the water surface elevation, the vertical error associated with the water surface elevation, coordinate information for each point location, and the bottom elevation for each point. We collect cross-sectional transects at set intervals along the main channel and at tributary confluences and other hydraulically important locations.
Cross-sectional transects can be used for modeling purposes to estimate water quality at different water surface elevations or to determine how much stream bottom is inundated at different discharge amounts.