Hydrography survey
Jasper Schaer, U.S. Army Corps of Engineers Galveston District, Hydro Survey Team, observes a Houston Shipping Channel map after completing a post dredge survey aboard the Tanner II survey vessel. Single beam sonar was used for this survey because this version uses lower frequency sound than multi-beam sonar. The lower frequency gives better measurements through the fluff or fine sediment at the bottom of the Houston Shipping Channel.

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Photo by: Luke Waack |  VIRIN: 230605-A-XJ740-0136.JPG

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