Kristie Andresen and Steve Litvin

The Use of CODAR High Frequency Radar to Attain Wave Height Measurements

How do the Measurements Compare to Other Platforms?



CODAR estimates of significant wave height at LEO-15 were compared to estimates from buoys maintained by the National Data Buoy Center (NDBC) of the National Weather Service.  One of the NDBC buoys is located 33 nautical miles south of Islip, Long Island in 40 meters of water.  The other is located in the Delaware Bay 26 nautical miles south of Cape May, NJ in 28 meters.  Additionally one data set from a mooring at LEO-15 in 10 meters (Node A) was compared to the CODAR measurements.  Several time series of the data collected were plotted using Matlab.
 
 

Figure 1 - Significant wave height estimates from the Long Island buoy, Delaware Bay buoy, Node A at LEO-15 and the Northern and Southern CODAR sites.  Comparing the two buoys and the node, the Long Island buoy encounters the highest waves, Delaware Bay Buoy the next highest, and Node A encounters the lowest of the three.  This is as expected, since the Long Island buoy is in the deepest water, and Node A is in the shallowest.  Measurements from the two CODAR sites follow the other three measurements until the point where waves begin to increase beyond two meters due to Hurricane Floyd.  This is a result of the system limitation described earlier, indicating that the Rutgers CODAR frequency setting of 25 MHz will result in reliable wave measurements only up to about two meters.
 
 

Figure 2 - Significant wave height estimates for this period in time shows that the two CODAR sites produce measurements that are close to measurements from the two buoys.
 
 

Figure 3 - Significant wave height measurements from this time frame once again confirms the  CODAR system limitation that waves cannot be measured beyond two meters.
 
 

Figure 4 - As in Figure 2, significant wave height estimates for this period in time shows that the two CODAR sites produce measurements that are close to measurements from the two buoys.
 
 

Figure 5 - Once again, CODAR measurements are close to those obtained by the buoys, with the limitation that using the current Rutgers transmission signal of 25 MHz, wave heights above two meters cannot be accurately measured.


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