ism ic R eflec tion Profiling and ic Survey effect to signa ls to be rece ived.Рhave been described in the paper, and w ith fruitful Key word s: dewar, the HTS omete rРresults of their app lications to site investigations forРa rtificial reef, aquafarm , m arine reclama tion, chan2 A STUDY AND D EVELO PM ENT O F THEРnel dredging, marine geological structures, bottom CO NTROL SY STEM FO R THE THR EE 2COM 2Рpipelines, a swell as sunken ship s introduced. PO NENT HTc R F SQU ID M OM ETERРKey word s: multi2beam echo sounding; side scan ZHAO Yi, CHEN Xiao2dong ( Institute of Geophysi2Рsonar; single2channel seism ic reflec tion profiling; cal and Geochem ical Explora tion, CAGS, LangfangРm arine m ic survey Hebei 065000, China ). COM PU TIN G TEC H2Р N IQU ES FOR G EO PH YSICAL AND GEOC HEM ICAL