Table 8
Humboldt Bay GIS Physical Characteristics Data Layers1
as of 12/2000
Coverage
Sources of Information
(%)
Mean High/Low
100
(1) 1993 NOAA Chart; Scale 1:25,000; low tide and
Tides
high tide areas.
(2) 1944 USC&GS Chart.
100
Scale 1:30,000; low tide and high tide areas.
(3) 1912 C&GS Chart; Scale 1:30,000; low tide and
100
high tide areas.
Substrate Types
(1) Sediment particle size distribution map from: R.W.
Thomson (1971) as reported in Shapiro & Assoc.
(1980).
100
Subsurface
Topography
(1) 1993 NOAA Chart; Scale 1:25,000; Bathymetry =
90
(Bathymetry)
TIM or GRID.
Shoreline Types
"Classify" GDFG " tidal influence"
0
Disturbance
Recent dredging maps; 1993 NOAA Chart; Scale
1:25,000, 1944 USC&GS Chart, 1912 C&GS Chart;
Scale 1:30,000, 1977 NOAA Chart Scale 1:30,000.
50
Freshwater and
Salinity Movement
Hydrologic model set up for each drainage area.
20
Water Quality
Shellfish Advisory Committee water quality data, older
studies including Ecology of Humboldt Bay (1992); and
J.Pequegnat, unpublished 1981 data.
100
Sedimentation and
(1) Bathymetric changes from 1912, 1944, 1977, 1993
Erosion
Charts.
(2) Zones of sedimentation/ erosion based on slope
with low slope (flats) = sedimentation zones and high
slope (channels) = erosion zones.
(3) Zones of sedimentation/erosion based on particle
size distribution map (Thompson 1971).
20
1
Description of data layers from Progress Report of Physical Mapping Phase II from "Humboldt
Bay Management Plan 2000 Progress Report," HBHRCD, December 2000.
Contacts with specialized knowledge and research interests
Dr. John Pequegnat. Oceanography Department, HSU, has conducted
research on nutrients and phytoplankton in Humboldt Bay and nearshore waters
which was published as his Ph.D. dissertation from the University of Oregon,
Department of Oceanography. He has directed senior class marine field projects,
some collecting synoptic hydrographic data in North Bay, North Bay Entrance
Channels, and Entrance Bay.
Dr. Jeffry Borgeld. Oceanography Department, HSU, has a collection of
student generated beach profiles for various locations in the Humboldt Bay
littoral cell from the Eel River to the Mad River. The data are not in a form that
is readily available. He has collected beach profiles in the Humboldt Bay littoral
cell and at the Mad River mouth in relation to the study of the migration of the
mouth of the Mad River. He has videotaped storm waves at the entrance to the
Mad River.
25
Chapter 4 Inventory of Available Data and Data Sources
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