maintained at the University of Connecticut's Marine Sciences 

 Institute at Avery Point in Groton, Connecticut indicate that the 

 primary effects associated with the passage of Gloria were 

 relatively shortlived and essentially confined to a approximately 

 two hour period between 1300 and 1500 EDST on 27 September 1985. 

 The winds during this period were from the south to southeast with 

 an observed maximum speed at Avery Point of approximately 14 km/h 

 (87 mph) . At all local stations, detailed observations during the 

 height of the storm were lost due to widespread power outages. 

 Minimum barometric pressures were just below 982 millibars (29.0 

 inches, Figure 1-3) . 



2 . METHODS 



2.1 Bathymetry and Navigation 



The precise navigation required for all field operations 

 was provided by the SAIC Integrated Navigation and Data Acquisition 

 System (INDAS) . A detailed description of INDAS and its operation 

 can be found in Contribution #60 (SAIC, 1986) . Positions were 

 determined to an accuracy of ±3 meters from ranges provided by a 

 Del Norte Trisponder System. Shore stations were established over 

 known benchmarks at Stratford Light and Lighthouse Point Light. 



The depth was determined to a resolution of 0.1 feet (3.0 

 cm) using a Raytheon DE-719 Precision Survey Fathometer with a 208 

 kHz transducer. The fathometer was calibrated with a bar check at 

 fixed depths below the transducer before the survey began. A 

 Raytheon SSD-100 Digitizer was used to transmit the depth values 

 to the SAIC computer system. 



During analysis of the bathymetric data, the raw depth 

 values were standardized to Mean Low Water by adjusting for ship 

 draft and for tidal changes for the duration of the suirvey. All 

 data points in terms of depth and position were checked for 

 unreasonable values due to any malfunctions with the peripheral 

 instrumentation (navigation or bathymetry) so that the final 

 contour plots did not contain errors. 



Precision bathymetric surveys were conducted in August 

 at the ten disposal mounds contained within the CLIS disposal site 

 (Figure 2-1) . The surveys were designed to cover the areas of the 

 disposal mounds so that volume changes could be calculated by 

 comparison with future surveys. Surveys at the individual mounds 

 were conducted at a 25 m lane spacing for detecting small changes 

 in depth; in addition, a survey of the entire CLIS site was 

 performed at a 50 m lane spacing. In October, identical surveys 

 were conducted at the STNH-N, STNH-S, MQR, CS-1, CS-2, and FVP 

 mounds so that any changes in depth and volume calculations would 

 indicate whether erosion or deposition had occurred. 



