TABLE 4. PHYSICAL PROPERTIES OF SEDIMENTS IN THE SHALLOW BERING SEA 





Sediment Type 

 (2) 



Median 



gr. diam 



(mm) 



Sand 

 (%) 



Silt 

 (%) 



Clay 

 (%) 



Dens 

 Solids 



ity 

 Sat. 



Porosity 



Location 

 (1) 



(g/cc) 

 (3) 



(g/cc) 

 (4) 



(%) 



(5) 



A-A' 



Silty, very fine sand 



0.100 



63.4 



35.9 



0.7 



2.64 



1.84 



50 



B 



Very fine sand 



0.101 



81.3 



18.3 



0.4 



2.69 



1.93 



46 



B' 



Sandy silt 



0.060 



27.9 



71.3 



0.8 



2.68 



1.82 



52 



c-c 



Very fine sand 



0.123 



86.6 



13.0 



0.4 



2.69 



1.93 



46 



NOTES: 



(1) Correlates with figures 1 and 2 and table 3. 



(2) Nomenclature of Shepard." 



(3) Pycnomeier; avg. of 2 representative bulk samples; ±0.03. 



(4) Using porosity variations, density of solids, water density of 1.03 g/cc and equation: 



Density, saturated sediments = porosity (density, water) + density, 

 solids (1.0 -porosity). 



Variations: A-A' : +0.01, -0.12; B: +0.00, -0.13; 



B': +0.00, -0.13; C-C: +0.03, -0.10. 



(5) Porosity determined by laboratory experiments; that shown is best estimate of in situ 

 conditions. 



Variations: A-A' : +7, -2; B: +9, -0; B 1 : +8, -0; C-C: +7, -3. 



TABLE 5. ACOUSTIC PROPERTIES OF SEDIMENTS IN THE SHALLOW BERING SEA 





Sound Speed 

 (m/sec) 



Attenuation 

 (dB/ft) 



(4) 



V 2 /V, 

 (5) 



P\l 2 



Location 

 (1) 



Lab. 

 (2) 



In Situ 

 (3) 



(X 10 5 g/cm z sec) 

 (6) 



A-A' 



1578 



1505 



3-6 



1.036 



2.77 



B 



1640 



1590 



3-5 



1.079 



3.07 



B' 



1545 



1490 



4.4 



1.012 



2.71 



C-C 



1640 



1590 



3-5 



1.080 



3.07 



NOTES: 



(1) Correlates with figs. 1 and 2 and tables 3 and 4. 



(2) Measured (resonance technique, Shumway): B' ; others computed from 

 equation V - 2362 -1568 (porosity), or curves of Shumway. 33 ' 3 "' 54 



(3) Lab. values corrected to in situ. 5 



(4) At 24 kc/s; measured (resonance technique, Shumway): B' ; others 

 from Shumway. 33 ' 34 



(5) Sound speed in sediment (V 2 ) divided by sound speed in bottom water (V,). 



(6) Impedance: sediment saturated density X sediment sound speed in situ. 



21 



