Deployment of Oceanographic Instruments in High-Energy Environments and Near Structures
PURPOSE: The Coastal and Hydraulics Engineering Technical Note (CHETN) herein describes methods and techniques for acquiring measurements of waves, currents and suspended sediment from high-energy wave and current environments. The case study described herein involved measurements obtained in proximity to a large jettied inlet. Two techniques are described: a. Deployment of instrumented platforms in a high-energy surf zone. b. Deployment and recovery of instrumented tripods near a submerged
... ear a submerged structure using a Sikorsky HH-60J "Jayhawk" helicopter. BACKGROUND: High-quality field measurements are an integral part of the design process for new and existing coastal engineering projects. A key to success in modeling is a field measurement program to obtain as much information as possible about key input parameters and especially model output parameters. Calibration and verification data assist in reducing uncertainty of model output so that final results become practically useful, quantitative approximations. Carefully collected, high-resolution field measurements yield valuable insights to aid in the interpretation of processes active in a project area. One of the major challenges in the northeastern Pacific Ocean, is to obtain field measurements when large breaking waves and strong currents are present most of the time, particularly in the surf zone and in close proximity to coastal structures such as jetties and breakwaters. Conventional methods such as SCUBA diver assistance or over-the-side vessel deployments are not feasible in such environments in terms of safety, economics and logistics. Alternative approaches including the use of helicopters (e.g., McGehee and Mayers 2000) and innovative intertidal deployment techniques have been adopted.