

 function [phi] = ST_d2phi(d)

 DESCRIPTION:
    Convert a sediment grain size in m to phi 

 INPUT:
    d: sediment grain size in m

 OUTPUT:
    phi: sediment grain size in phi scale

 EXAMPLE USAGE
    phi = ST_d2phi(.001)

 Author(s):  
    Geoff Cowles (University of Massachusetts Dartmouth)

 Revision history
   
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