Exercise 8 Post

Exercise 8 Post - Exercise 8 Map Workshop Post-exercise...

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Exercise 8 Map Workshop Post-exercise Assignment Jong Park GSI: Kristen Podolak 1. In the assigned overlay analysis, I examined the relationship between the slope of the landscape and the frequency of landslides. My hypothesis was that there is a positive correlation between slope and landslides. My analysis indicated that there were 6 slides occurred in percent-slope category 0-8%. 37.5% of all slides occurred in this category, and approximately 10% of the total area of the canyon was comprised by this category. By dividing the percent of slides occurred by the area comprised by this category, we could get a ratio of 3.75, which explained how much of the landslide was caused by the 0- 8% slope. In 8-15% slope category, 2 slides, which was 12.5% of all slides occurred took place, 10% of the canyon was comprised by this category, so the ratio was 2.5. In 15-25% slope category, 11 slides, which was 68.8% of slides occurred took place, 5% of the canyon was comprised by this category, so the ratio was 4.6. In >25% slope category, 16 slides, which is 100% of all slides occurred took place, 70% of the canyon was comprised by this category, so the ratio was 1.4. Relative to the areas the percent slope categories comprise, this was the order of least slide-occurring to most slide-occurring categories: >25%, 8-15%, 0-8%, and 15-25%. The result does not support my hypothesis. The reason that slope and slides are not positively correlated is because, in >25% category, the land is too steep to accumulate sediments that will cause the landslides. The reason for the high ratio of 0-8% category may be that the slides already occurred in the area caused the slope to go down. All in all, the intermediate to high 15-25% slope

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This note was uploaded on 02/02/2011 for the course ES 10 taught by Professor Kondolf during the Fall '09 term at University of California, Berkeley.

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Exercise 8 Post - Exercise 8 Map Workshop Post-exercise...

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