Accession Number : ADA267643


Title :   Airborne Electromagnetic Hydrographic Techniques


Descriptive Note : Final journal article rept.,


Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS


Personal Author(s) : Mozley, E C ; Kooney, T N ; Fraley, D E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267643.pdf


Report Date : Jan 1993


Pagination or Media Count : 5


Abstract : The importance of maintaining accurate information on water depths and sediment distributions in coastal regions is becoming increasingly important as large groups of the global population concentrate in these areas. Both commercial and defense segments of society require accurate and timely bathymetry in this dynamic environment. The traditional measurement techniques that have been used to monitor the evolution of these rapidly changing coastal zones are slow and expensive. As a result, charts of many parts of the world are grossly outdated. To lessen this problem, airborne lidar mapping systems have been developed and are currently being used. However. the performance of these systems is degraded by the numerous existent environmental conditions such as water clarity, water surface roughness, and bottom vegetation. To circumvent these problems, airborne electromagnetic (AEM) methods have been developed for measuring water depths and sediment conductivity from helicopter platforms. The first generation of digitally controlled AEM systems have been evaluated and found to provide accurate water depths and water conductivities from the shore to depths in excess of 20 m.... Airborne electromagnetic, Bathymetric, Survey.


Descriptors :   *BATHYMETRY , *HYDROGRAPHIC SURVEYING , MEASUREMENT , COASTAL REGIONS , CONDUCTIVITY , DYNAMICS , HELICOPTERS , MAPPING , ELECTROMAGNETISM , SHORES , SEDIMENTS , VEGETATION , MONITORS , AIRBORNE , SURFACE ROUGHNESS , DEPTH , POPULATION


Subject Categories : Physical and Dynamic Oceanography


Distribution Statement : APPROVED FOR PUBLIC RELEASE