StreamPro ADCP Operation Manual - global site

StreamPro ADCP Operation Manual------ M ------Main Lobe: The main focus of energy emitted from a transducer. If thetransducer were a flashlight, the main lobe would be the visible beam oflight.Mariner: Model name for a Workhorse Monitor ADCP configured for underwaycurrent measurement in shallow water (as opposed to the deep waterOcean Surveyor systems).Modes: TRDI offers several modes of operation that are optimized for certainconditions. There are currently five modes of operation for water profilingavailable from TRDI:Mode 1: General purpose water profiling. This is the most robustprofiling mode, designed for the widest variety of measurement applications.Mode 1 can resolve high velocities and can measure overlong ranges.Mode 5: For high resolution profiling in shallow water with lowflows. Mode 5 should be used with bottom tracking. It offers thelowest standard deviation per measurement, but is also the most limitedin its allowed performance envelope (e.g. low velocity flow,slow platform movement, no high shears or turbulence).Mode 8: Also for high resolution profiling in shallow water. Mode8 should also be used with bottom tracking. It has higher standarddeviation per measurement than mode 5, but allows a somewhatwider performance envelope.Mode 11: The latest in our high resolution profiling modes. Intendedfor the shallowest water, it is also well suited for boundarylayer studies. Mode 11 should be used with bottom tracking. It allowssmaller depth cells (1 cm), more depth cells, and has improvedsignal processing which allows faster ping rates and a wider performanceenvelope than modes 5 and 8. Mode 11 is intended to supercedemode 5.Mode 12: Offers increased resolution (1 cm depth cells) and usesmultiple sub-pings to improve the standard deviation of each measurement.Mode 12 allows measurement of fast moving, shallow water;and can also be used to improve the standard deviations of anymeasurement (any range, any velocity) when the ADCP heading isfixed or reasonably steady.Monitor: Model name for a direct reading Workhorse ADCP.Moving Bottom: Some rivers carry such a heavy sediment load that theydo not have a clearly identifiable bottom. In essence, the mud just keepsgetting thicker and slower with depth. In such environments it is not un-P/N 95B-6003-00 (February 2008) page 105