station. The effect of Hurricane Gloria on this disposal mound 

 apparently was minor and transient, because the present survey showed 

 results comparable to the pre-hurricane survey of August 1985. 



3.3.3 Stamford-New Haven South (STNH-S) Mound 



No change in the major modal sediment grain-size has been 

 detected in this survey relative to earlier surveys. All stations 

 had a major mode in the > 4 phi (silt-clay) size class with many 

 stations having a minor sand mode. 



For those stations at the STNH-S mound where dredged 

 material was identified, its thickness appeared to be deeper than the 

 penetration of the camera's prism (distribution shown Figure 3-36). 

 Stations 400S, 600S and 600E showed no evidence of dredged material, 

 and the presence of dredged material at stations 400E and 200SW was 

 guestionable. This distribution of dredged material is comparable to 

 that mapped in August 1985, which showed the presence of reduced 

 sediment at or near the sediment surface in almost half the station 

 replicates. No station showed evidence of this condition in the 

 present survey. Stations 200W and 200NW showed similar disposal 

 stratigraphy (Figure 3-27) ; the same superposition of materials with 

 different grey scales or optical reflectance (low over high over low) 

 was seen at both stations. The low reflectance surface layer, which 

 was 3 to 4 cm thick, did not appear to be associated with many 

 macrofauna, and the sharp contacts of these units suggest that 

 bioturbational mixing rates were slow or nonexistent. 



The post-Hurricane Gloria REMOTS® survey (November 1985) 

 showed this area to be affected by the storm. The photographs 

 revealed shell-lag deposits, mud clasts, exposed worm tubes, and 

 reduced sediment patches near the surface. Surface erosion, based 

 on the lengths of exposed worm tubes, was estimated to range from 0.3 

 to 0.4 cm. Station CTR appeared to be most affected; the mean 

 apparent RPD depth decreased 3 cm in thickness after the storm. This 

 was attributed to physical removal of the surface sediment by near- 

 bottom turbulence. No remaining evidence of such storm-related 

 phenomena was indicated in the present survey. 



The freguency distribution of small scale boundary roughness 

 had the major mode at 0.8 cm (Figure 3-38) . With a sample mean of 1.1 

 cm, the distribution of values was significantly greater than both the 

 new CLIS reference station (mean = 0.70; p = 0.03, Mann-Whitney li- 

 test) and the values measured in August 1985 (p = 0.008). The 

 increase in boundary roughness may be attributable to the increased 

 disturbance or sediment redistribution experienced as a result of 

 Hurricane Gloria. 



The freguency distribution of mean apparent RPD depths at 

 STNH-S was bimodal, with a major mode at 4.0 cm and a minor mode at 

 2.0 cm (Figure 3-38). Mean RPD values for stations 200W and 200NW 



15 



