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River surveys cover the collection of topographic elevations and
hydrographic depths to model the shape and slope of the river system
including flood plane. River environments are very challenging for
Airborne Lidar Bathymetry systems, from an environmental perspective.
This is primarily due to poor water clarity (significant suspended
sediments) and the potential presence of white water conditions
in portions of the river. While these are obvious concerns, the
survey can be timed such that it occurs during minimal flow conditions,
thus minimizing the effect of turbidity and white water. In many
cases, the water depths will be shallow enough to collect Airborne
Lidar Bathymetry data over a majority of the river. Gaps could potentially
be filled using other methods. Project lengths range from tens of
kilometers to hundreds of kilometers along the river, with corridor
lengths ranging from tens of meters to a kilometer or two. The goal
of such surveys is to create a reasonably high resolution integrated
bathymetric / topographic DEM of the river system, so that hydraulic
analysis and flood plain maps can be created.
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