. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 64° - -j- + - Figure 17-5. Rose diagrams representing trend and density of gouges. Division into areas I-V based on zones of similar trending gouges. Zone of shorefast ice based on evaluation of Landsat imagery (Dupre 1977, 1978; R. E. Hunter, pers. comm. 1977). Single gouge widths range from 5 to 60 m; a width of 15-25 m is most common. Gouge patterns range from straight through sinuous to sharp-angled turns (Fig. 17-4). Incision depths of gouges, as measured on the sea-floor profile of
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 64° - -j- + - Figure 17-5. Rose diagrams representing trend and density of gouges. Division into areas I-V based on zones of similar trending gouges. Zone of shorefast ice based on evaluation of Landsat imagery (Dupre 1977, 1978; R. E. Hunter, pers. comm. 1977). Single gouge widths range from 5 to 60 m; a width of 15-25 m is most common. Gouge patterns range from straight through sinuous to sharp-angled turns (Fig. 17-4). Incision depths of gouges, as measured on the sea-floor profile of sonographs (Fig. 17-4E) and on the 200-kHz fathometer record (Fig. 17-3B), can be as much as 1 m, but most gouges range in depth from to m or less. These figures may be conservative because of the geometric relation between the narrow width of the gouge and the spread of the acoustic cone of the fathometer trans- ducer (Reimnitz et al. 1977). The original incision depth is impossible to determine unless the gouge is seen as the keel plows the bottom, because afterward the gouge will be filled in. Multiple gouges, or raking (Figs. 17-4F and 17-4G) are produced when multikeeled floes (such as pres- sure ridges) plow or rake the bottom sediment, creating many parallel furrows (Reimnitz et al. 1973, Reimnitz and Barnes 1974). Unlike single gouges, raking is not ubiquitous, but in the Yukon prodelta area the raking process is more prevalent than single gouging. Zones of raking are 50-100 m to several km wide. The deepest incisions caused by raking ob- served on the records are about 1 m; but raking, like
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