2. Pressure-Sensitive Gages 



Due to the depth-period attenuation present when wave record- 

 ings are taken using a pressure sensor placed near the ocean bottom, 

 the recordings will require a correction factor to obtain a true wave- 

 height reading. 



To obtain the true wave-height data (significant height and sig- 

 nificant period), use the following procedure: 



a) Determine the significant height and period outlined in the 

 in the method for step-resistance gages. 



b) Using the significant period refer to Figure 63 and find the 

 line representing this wave period. 



c) Determine the water depth at the time the recording was taken. 



d) Intersect the water depth and wave period on the period curve. 



e) Read the K (response) factor below the point of intersection. 



f) Divide the significant height (found in a) above) by the 

 K factor to obtain a corrected wave height. 



The curves apply only to a wave gage mounted on the ocean bottom. 

 If the gage is mounted near the surface, additional curves will be 

 required. Data for preparing these curves (K factor) is available on 

 page D2 and Tables D-1 and D-2 of CERC Technical Report No. 4, "Shore 

 Protection. Planning and Design", 3rd Edition, 1966. 



116 



