River channel thalwegs (the line of lowest elevation within a valley or watercourse) are often dynamic, and sometimes hidden features of large river systems. Especially low slope or impounded systems. The thalweg is a critical geomorphological feature of river and reservoir systems and affects everything from sediment transport, to fisheries habitat, to algae or invasive plant control.
Thus a good bathymetric contour map is a necessary pre-requisite for effective river and reservoir management. Here, we walk you through how to use new real time technologies (C-MAP’s Genesis Live) to produce smooth, precise, and accurate maps of hidden river thalwegs all within one trip to the site and with automated post-processing with BioBase’s EcoSound. We’ll use an annotated image gallery to take you through this process.
Continue reading “Mapping Hidden Channels with Genesis Live”
BioBase’s EcoSound bottom composition (hardness) algorithm has become quite popular for researchers and lake/pond managers to determine where sedimentation from the watershed may be occurring. However, interpreting sonar returns in shallow environments (e.g., less than 7 ft or 2 m) with off-the-shelf sonar is challenging, especially if aquatic vegetation is present. Each situation is different and the objective of this blog is to inform you of how to interpret your EcoSound map in situations when you encounter counter intuitive bottom hardness results.
Here are some high level points to remember.
Continue reading “Interpreting bottom hardness in shallow lakes and ponds: digging deeper into the data”
Thanks to advances in physical, chemical and biological technologies and funding that are focused on reducing sedimentation or muck depth in waterways, many water resource practitioners are eager to determine how much sediment is in a waterway of interest and how much could be removed. As such, we frequently are asked: “Will BioBase tell you how deep the sediment is?”
Continue reading “FAQ of the year: Does BioBase EcoSound Map Sediment Depth?”