Exercise3. Influence of landslide volume on traffic distance and time


In Exercise 2, I created a buffer zone and compared the relationship between road density and landslides. Exercise 3 I want to further analyze the impact of landslides on roads and traffic. For large landslides, how does it affect travel distance and time? If the landslides at the same location have different volumes, do people choose different ways to detour?

2. Tool or approach that be used

Buffer: First of all, attribute a table to find out what is volume and area of landslide, based on the area of landslide, determine if the construction site is needs, if yes, create buffer with appropriate distance.

Network analysis: Network analysis is to analyze what is trip time and distance with buffer. First click Network Analysis, then choose route as target. The route is presented, then click edit and create features, add stops and buffer, stops should be same when the route with or without buffer is analyzed.

Show directions: This tool is to estimate trip time and dictance. Also the difference between highways and urban roads will also be shown.


Figure 1. 213-highway normally trip map
Figure 2. 213-highway 250m buffer zone detour map
Figure 3. 213-highway 500m buffer detour map
Figure 4. Directions of normal trip on 213.
Figure 5. Directions of 500m buffer on 213

By comparing Figures 4 and 5, it can be seen that the 500m buffer zone will cause a 5-minute detour. Due to the difference in speed limit and traffic flow on highways and urban roads, the time may be longer.

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1 thought on “Exercise3. Influence of landslide volume on traffic distance and time

  1. jonesju

    Hongyu, this is an intriguing result. However, some parts of your findings don’t make sense to me.

    First, what is the point of generating a circular buffer around the landslide? What is the buffer supposed to represent – the size of the landslide? Is it supposed to represent the runout path of the landslide? If so, you need to think about which direction (i.e., down slope) the landslide moves.

    Second, the alternative routes generated don’t seem to make sense relative to the different buffers you used. Using the smaller buffer, you generate the alternative route shown in Figure 2, while using the 5–m buffer you generate the route shown in Figure 3. However, the route in Figure 2 actually passes farther away from the landslide than the route in Figure 3. Why are these two routes different? how much time is added to the total trip for the route shown in Figure 2? how would you select which alternative route to use?

    Third, can you please demonstrate how this approach works using more than one landslide?

    Please provide some responses to these questions and comments in your final version of Exercise 3, due May 29.

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