This project, undertaken as the culminating point of GEOG 181B: Advanced GIS, sought to relocate the Amtrak Pacific Surfliner train where it passes close to the ocean in San Clemente, CA to protect it from the threat of sea level rise. Infrastructure such as rail is like good shoes; you want to buy it for life, and since climate change has put all kinds of holes in our proverbial shoes, we had ought to spring for some nice tough ones that'll last a long time. Is that metaphor too weedy? Anyway, our immediate challenge was the many factors that go into rail relocation; slope is most important to construction, then sea level rise and flooding protection, then considerations for wetland, geology, and residential area avoidance. To handle all of these disparate factors, we chose to apply a series of the analyses that we learned about in class.
The three main analyses were a cost allocation algorithm that could weight factors differently depending on importance, a distance accumulation algorithm that could parse the cost raster, and an optimal pathing algorithm that could recommend the cheapest route across the city. We supplemented this main analysis with a series of network and viewshed analyses to assess the efficacy of our proposal. Our project concluded that the best course of action would be the diversion of the Surfliner onto the I-5 freeway as it passes through San Clemente, creating a mixed-use transportation setting. This option is efficient with its use of public space (the San Clemente line is already single-track), precedented in Southern California, and extremely robust in mitigating climate effects.
Read the full report that my team and I wrote for more specifics on our analyses!
A good example of median transit: the A Line / 210 Freeway between Pasadena and Azusa. Note the double track; a single-track solution would save even more space.