Application of Four-beam Echo Sounder & Dual-frequency Sonar Flanking to Sweeping Engineering

The techniques of four-beam echo sounder and dual-frequency sonar flanking applied for sweeping engineering test,especially for that of the vast test area can not only speed the sweeping,save the cost but also gain high accuracy and high quality of sweeping effect.It will bring the inestimable economic benefits for the engi-neering putting into operation earlier.So,it is worthy to be recommended and selected in port construction.