Automated Hydrography for Channel Dredging

by Henry R. Spies, Chf.; Survey Branch, Corps of Engrs., Philadelphia Dist., Philadelphia, Pa.,

Serial Information: Civil Engineering—ASCE, 1977, Vol. 47, Issue 6, Pg. 73-75

Document Type: Feature article


After studying both non-line of sight and microwave systems of over-water distance measurement, one of the latter was selected for checking dredged channel depth on the Delaware River. Horizontal position of a survey boat is so automated that the survey boat's position can be determined once each second. Another display shows water depth at that location, so whether or not dredging is needed on the river channel leading to Philadelphia can be rapidly determined.

Subject Headings: Automation | Hydrographs | Dredging | Geomatic surveys | Microwaves | Distance measurement | Small craft | High-rise buildings | United States | Delaware | Philadelphia | Pennsylvania

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