Click on one of the sub-cells for a large, detailed map of the GPR profiles, as shown in GPR Appendix. For an interactive version, choose Interactive Maps from the main menu.
Ocean Shores GPR profile locations Grayland Plains GPR profile locations Longbeach GPR profile locations Clatsop Plains GPR profile locations
Figure 3a - GPR Profile locations in North Beach sub-cell of Columbia Littoral Cell Figure 3b - GPR Profile locations in Grayland Plains sub-cell of Columbia Littoral Cell Figure 3c - GPR Profile locations in Longbeach sub-cell of Columbia Littoral Cell Figure 3d - GPR Profile locations in Clatsop Plains sub-cell of Columbia Littoral Cell
Figure 3a-d: Locations of shore-normal GPR profiles in the four CRLC subcells. Most GPR profiles or combined profile segments, extend from the modern beach backshore to near the backedge of the barrier or beach plain. GPR profile names, profile length, antenna frequency, step size, topographic correction, and year of survey are shown in Table 1. GPR profile starting points, i.e., either to the west or east, are identified by UTM coordinates in Table 3. Longshore spacing between GPR profiles, about 5 km, was established to provide a similar survey coverage, i.e., data density, to that of offshore seismic tracklines (Cross et al., 1998).