Accession Number : ADA187713

Title :   Evaluation of Vertical Motion Sensors for Potential Application to Heave Correction in Corps Hydrographic Surveys.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB

Personal Author(s) : Downing, George C ; Fagerburg, Timothy L

PDF Url : ADA187713

Report Date : Oct 1987

Pagination or Media Count : 84

Abstract : This report describes techniques and equipment that can help surveyors obtain the best practical vertical reference for hydrographic surveys in the face of adverse tide, river stage, and wave conditions. USAWES efforts involved evaluating a heave compensation system (HIPPY 120) and exploring the possibility of using Doppler equipment for measuring vertical boat motion. Some specific measurement techniques for monitoring vertical references for hydrographic surveys under given field conditions are addressed. Depth transducer draft, boat flotation plane, shore references and dynamic vertical motions of the boat hull are discussed. Vertical displacement measurement equipment using automatic electrooptical tracking systems, video-type optical tracking systems, laser leveling systems, and satellites is assessed and found to have potential for future consideration and application in improving survey accuracy. Evaluation of a heave compensation unit based on a pendulum-stabilized accelerometer platform (HIPPY 120) was attempted on a survey boat. Protracted difficulties with the system prevented a quantitative evaluation. These results lead to the conclusion that for this system to be successfully used during actual survey operations, there must be a higher-than-average level of technical skill among the personnel on the survey boat.

Descriptors :   *HEAVING, *HYDROGRAPHIC SURVEYING, ACCURACY, AUTOMATIC, BOATS, COMPENSATION, CORRECTIONS, DEPTH, DETECTORS, DISPLACEMENT, DOPPLER SYSTEMS, DYNAMICS, ELECTROOPTICS, FIELD CONDITIONS, FLOTATION, LASERS, LEVELING, MEASUREMENT, MEASURING INSTRUMENTS, METHODOLOGY, MOTION, SHIP HULLS, SKILLS, SURVEYS, TEST AND EVALUATION, OPTICAL TRACKING, TRANSDUCERS, VERTICAL ORIENTATION, WATER WAVES, ACCELEROMETERS, PENDULUMS, SHIP MOTION, NAVIGATION REFERENCE, SHORES, GYRO STABILIZERS

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology
      Underwater and Marine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE