Summary

Introduction 1, 2
  Study Area
  Previous Studies
  Oceanography
  Seafloor Materials

K1-93 Survey
  Methods
  Scope of Work
  Navigation
  Sidescan Sonar
  Bathymetry
  Profiling

Results
  Bathymetry
  Sonar, 3.5kHz 1, 2, 3

Conclusions

Figures
  1   2   3   4   5
  6   7   8   9 10
11 12 13 14 15
16 17 18 19 20

Plate 1

Apx 1: Statistics 1
Apx 1: Statistics 2
Apx 2: Equipment 1
Apx 2: Equipment 2
Acknowledgments

References 1, 2, 3

BATHYMETRY
The bathymetry map presented in figure 5 and plate 1 shows that the disposal sites are located in the broad southeast sloping trough having a slope of about 20 m/km (1:50). Large pinnacles and canyons are absent, but several relatively small canyons and areas of irregular topography exist in the immediate vicinity of the disposal sites. There are no obvious features on the bathymetry that are clearly caused by disposal activities. As seen on the bathymetric map (figure 5, plate 1, and Chase and others, 1994), the seafloor is naturally irregular in texture and slope. It is impossible to identify anomalous features on the bathymetry map that result from dredged material disposal. Relatively large bedforms, possibly sandwaves are evident along portions of 3.5-kHz subbottom profiles (figures 7, 8, and 9) collected form near the eastern edge of the former Honolulu Harbor disposal site. The bedforms extend well beyond both the disposal site boundaries and beyond the high-backscatter blanket interpreted as dredged material deposits, and probably result from natural rather than anthropogenic processes as stated in Torresan and others (1994a). The bathymetric data grid collected during the 1993 survey is too coarse in scale and the features created by disposal activities are apparently to small in relief to allow definition on the bathymetric map produced by Chase and others (1994) and shown in figure 5 and plate 1.