Equilibrium Beach profile measurement and sediment analysis : Mustang Island, Texas. PDF
Preview Equilibrium Beach profile measurement and sediment analysis : Mustang Island, Texas.
1UUL DUDLEY KNOX LIBRARY NAVAL POSTGRADUATE SCHOOL C MONTEREY >101 Equilibrium Beach Profile Measurement and Sediment Analysis: Mustang Island, Texas Major Report by ENS Erick B. Knezek, CEC, USN Submitted in partial fulfillment ofthe requirements for the degree of MASTER OF ENGINEERING December 1997 Major Subject: Ocean Engineering LEY KNOX LIBRARY •OSTGRADUATE SCHOOL MONTEREY CA 93943-5101 Abstract This engineering report describes the measurement techniques and results ofan A&M equilibrium beach profile survey and sediment analysis conducted by Texas University, Ocean Engineering Program, at Mustang Island, Texas on September 27, 1997. The main objective ofthe project was to obtain an accurate equilibrium beach profile at a location on Mustang Island, and to compare the actual profile to a predicted profile. The predicted profile is based on the median grain size diameter ofsediment samples taken from the dune crest to approximately 4000 ft offshore. The survey was accomplished using an electronic total station with a standard surveying rod on land, and the underwater profile was measured with a "sled" towed behind a boat. A triple prism was attached to both the top ofthe rod and sled. The sled is an aluminum and steel structure equipped with two 12 ft long skids and a 36.5 ft mast. The predicted profiles are based on two methods. One method uses Dean's (1997) equation for equilibrium beach profiles, z = Ax 2/3 , where z is the water depth, A is the profile scale factor related to the sediment fall velocity, and x is the distance offshore. The other method involves a more complex analysis described by Dean and Dalrymple (1996), which accounts for a variation in sediment size and profile scale factor, A, in the offshore direction. Both methods are described and compared in this report. This data will also be used by Dr. R. G. Dean ofthe University ofFlorida in a study he is conducting on equilibrium beach profile prediction. u Dedication This report is dedicated to Jill, Amber, and Sammi for all oftheir love, patience, and assistance. in
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