90 120 ISO 180 ISO 120 



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Ocean sediment distribution 



Terrigenous Sediment Properties 



- Assume all continental shelves and slopes are terrigenous. 



- Typically complex and varied sediment type particularly, 

 near-shore, glaciated areas, high current areas. 



- Refer to National Ocean Survey charts to determine whether 

 sand or mud (cohesive) . ••"" 



Sand 



If nearshore and a "grab" 

 sample is available for grain 

 size determination, safe values 

 of (|) and "Yt, are: 



Soil Description 



Frictioo Angle, f 

 (deg) 



Buoyant Unit Veigbt, 

 kt/.> (lb/ft') 



Siady silt 

 Sllty ssod 

 Unifor* ssnd 

 Vell-grsded ssnd 



20 

 25 



30 



as 



SSO (S5) 

 8S0 (S5) 

 880 (SS) 

 960 (60) 



For-locations classed as 

 Abyssal Plains properties for 

 turbidites are appropriate. 



Proxinal ~< 30 miles from shore 

 Distal ~> 30 miles from shore 



Typical strength profile - turbidites. 



