C172 INCORRECTLY IDENTS TMB RWY 13 FOR RWY 31 AND IS CORRECTED BY TWR.'

Narrative

I WAS WORKING LCL CTL. LNDG RWY 31. MODERATE TFC DENSITY. ACFT X; A C172; CALLED INBOUND FROM THE NW OVER A VFR RPTING POINT 5 NM NW OF ARPT. I ISSUED INSTRUCTIONS TO JOIN THE L DOWNWIND LEG FOR RWY 31; AND RECEIVED A CORRECT READBACK. ACFT X WAS AT 1500 FT MSL ON INITIAL CALL. PATTERN ALT IF 1000 FT MSL. I NOTICED ACFT X DSNDING BELOW 1000 FT MSL 1 MI NW OF ARPT; AND THE TRACK ON THE D-BRITE INDICATED HE WAS LINED UP FOR FINAL RWY 13. I CONFIRMED THIS VISUALLY WITH MY BINOCULARS; INFORMED THE PLT; AND TOLD HIM TO SIDE-STEP TO THE L DOWNWIND RWY 31 AND CLB TO PATTERN ALT. IT OCCURRED TO ME THAT THIS CONFUSION BTWN RWY 13 AND RWY 31 HAPPENS RATHER FREQUENTLY. DUE TO PREVAILING LCL WX CONDITIONS; RWY 13 IS ACTIVE 5 TIMES AS OFTEN AS RWY 31. THIS CONFUSION DOES NOT SEEM TO EXIST AT ARPTS THAT HAVE A RWY 12/30 OR RWY 14/32. ASIDE FROM BANNING THE CONSTRUCTION OF RWYS ON A 130 DEG/310 DEG HDG; I HAVE NO SOLUTION TO THE PROB. BUT IT HAPPENS OFTEN ENOUGH TO CAUSE CONCERN FOR THE LCL CTLRS. EVEN A CORRECT READBACK IS NO GUARANTEE THE PLT WILL NOT EXPERIENCE 'FLT DYSLEXIA.' CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FACILITY SPECIALIST ADVISED APCH CTL PROVIDED BY MIA TRACON. TMB UTILIZES THEIR BRITE RADAR ONLY AS THEIR 'EYE EXTENSION.'