time-series records of near-bottom currents, water temperature, and relative turbidity 

 during winter storm events that may induce bottom sediment resuspension. The 

 measurement data were analyzed to determine whether low-frequency, tidal, and/or storm- 

 induced currents have sufficient magnitude to erode natural bottom sediments. The results 

 also represent valuable data for later use in validating hindcast and forecast models of the 

 erosion of capped mounds at PDS under a variety of storm conditions. 



1.4 Report Contents 



Following this Introduction, Section 2 presents a description of the field 

 measurement program conducted at PDS, including field operations, instrumentation, and 

 procedures for data acquisition and processing. Section 3 presents the results of the 

 measurement program, including water column characteristics, surface wave climatology, 

 near-bottom currents and turbidity, as well as a discussion of the processes affecting 

 bottom sediment resuspension. A summary of the results is presented in Section 4. 

 Section 5 presents pertinent references. Two Appendices present tabular results on wave 

 climatology in the vicinity of PDS. 



Oceanographic Measurements at the Portland Disposal Site during Spring of 1996 



