Field Exercise: Caddy Canyon Debris Flow(s)

Glenn Thackray
,
Idaho State University
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Summary

This exercise focuses on field observation and analysis of a debris flow that occurred near our campus in 2002. The strengths of the exercise are its emphasis on field observation, data collection, and synthesis of evidence.

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Context

Audience

This assignment has been used in a senior-graduate level geomorphology course with lower and upper division prerequisites.

Skills and concepts that students must have mastered


1. Students should be able to identify and describe evidence of debris flows.
2. Students should be able to synthesize evidence to determine the causes and effects of the debris flow.
3. Students should be able to evaluate effectiveness of engineered structures designed to prevent damage from future events.

How the activity is situated in the course

This is a stand-alone exercise in a diverse series of laboratory and field exercises.

Goals

Content/concepts goals for this activity


1. collecting field data and observations
2. evaluating possible debris flow sources
3. calculating sediment production rates
4. evaluating sediment retention dams

Higher order thinking skills goals for this activity


1. integration of field observations and data analysis
2. development of improved engineered structures

Other skills goals for this activity

Description of the activity/assignment

This exercise consisted of a five-hour field exercise and subsequent data analysis. In the field, students made individual observation, participated in discussions of evidence, and collected group field data. Data analysis consisted of calculations of sediment yields, channel slopes, and erosive power.
Designed for a geomorphology course
Addresses student fear of quantitative aspect and/or inadequate quantitative skills

Determining whether students have met the goals

Written report was evaluated by instructor

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Teaching materials and tips

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