Dana Point Case Study

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Dana Point is a city between Los Angeles and San Diego in southern California, but is best known for its harbor. Just north of the harbor lies a rocky beach with large cliffs only tens of meters from the sea, depending on tide level. Cliffs along the coast of southern California are prone to landslides due to their rock composition (mostly sedimentary) and high erosion rates from the sea but become increasingly stressed from overlying man-made structures and landscaping practices. For this reason, it is important to continually monitor the geological hazards that exist along the coast.

One relatively new way to monitor landscape changes over time is by the use of three-dimensional (3D) mapping. Long-term changes can be seen by
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3), erosional paths (Fig. 4), areas of possible landslides (Fig. 4) and sea caves (Figure 5).

Field Mapping
Four faults were mapped while walking alongside the cliffs after flying the drones. Dips were 42 to the S, 83 to the N, 70 to the S, and 44 to the south. If more faults were to be mapped, a trend may be noticed and useful when estimating the slump or landslide potential of the cliffs. These data points were uploaded as a KMZ file and put on Google Earth (Figure 6). From visual inspection of both in person and digitally looking at the cliffs, there are numerous faults throughout the entirety of the cliff. If future models were taken of the cliff, they could be compared over time to see movement.

3D Print
The 3D .STL file is shown in figure 7 and the printed model is shown in figure 8. As you can see in the printed model, a portion of it did not get printed. I believe this may be due to a chopping error when placing support. The cliff did vary in the Z direction quite a bit across the cliffs and may have played a role in the cutting of the pulled back
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I believe that this kind of mapping and continuous modeling over time will be very useful in future geologic studies and could be used to assess geologic hazards in an area.

Overall, this project was a lot of fun and I enjoyed the class as a whole. It let me know of software available to me for use in my future geology

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