{HEAD ~ A flow} of contaminated liquid phase water migrates toward the freeze front and a concentration of impurities is established in {TAIL ~ front} of the advancing freeze front 
{ HEAD ~ A flow } of contaminated liquid phase water migrates toward the freeze front and a concentration of impurities is established in { TAIL ~ front } of the advancing freeze front
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH