The remaining sluice foundation at the bottom of the channel will affect the normal operation of navigation.To accurately determine the spatial position of the remaining sluice foundation and ensure the safe running of ships,several com-mon engineering geophysical exploration methods such as Gem-2 multi-frequency electromagnetic method,Underwater topo-graphic scanning method,high-density electrical method,and magnetic gradient method are adopted which to compare the effec-tiveness,and summarize the technical points,and to accumulate technical data and engineering experience for the positioning re-search of typical obstacles in the channel.The sluice foundation is reinforced concrete,with a special engineering structure which has obvious physical properties different from the stratum,water,and mud.The results show that the plane boundary of the remaining sluice foundation is clearly detected by the Gem-2 multi-frequency electromagnetic method;and the vertical posi-tion and thickness are delineated effectively by high density electrical method and magnetic gradient method;and at the same time,combined with the result of underwater topographic scanning,the three-dimensional spatial attributes of the residual sluice were carefully described.
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万方数据