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Starting Point-Teaching Entry Level Geoscience > Teaching with GIS > GIS in Geoscience Examples > Floodplains (with GIS)
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Floodplains in the field (with GIS)

Mary Savina, Carleton College, msavina@carleton.edu

GIS components: Brian Welch, St. Olaf College, welchb@stolaf.edu

This activity was selected for the On the Cutting Edge Reviewed Teaching Collection

This activity has received positive reviews in a peer review process involving five review categories. The five categories included in the process are

  • Scientific Accuracy
  • Alignment of Learning Goals, Activities, and Assessments
  • Pedagogic Effectiveness
  • Robustness (usability and dependability of all components)
  • Completeness of the ActivitySheet web page

For more information about the peer review process itself, please see http://serc.carleton.edu/NAGTWorkshops/review.html.


This page first made public: Nov 21, 2005

This material is replicated on a number of sites as part of the SERC Pedagogic Service Project

Summary

In the original version of this lab, students measure a topographic and geologic cross-section across a floodplain by simple surveying and auguring techniques. This example demonstrates how simple GIS elements can enhance learning through added spatial context and the introduction of mapping techniques. The GIS elements encourage the students to consider the spatial context of the field observations, introduce GPS measurements, and can involve desktop GIS analyses.

The GIS enhancements to the lab are italicized.

Learning Goals

Goals


Skills

Context for Use

This lab can take from one to three hours, depending on the detail and methods of the surveying, drafting of the cross-section and maps, and number of soil cores dug.

Physical geology or geography course: Use during units on rivers, fluvial landscapes, or sedimentary processes
Earth History course: Use during unit on how geologic landscapes evolve
Earth systems science course: Use during discussion of storage and transport of water and sediment in river systems

Useful background information before lab: Distinguishing sand, silt, clay (although this can be taught during this lab). How to use a GPS receiver.

Field site: a stream or river with a floodplain, ideally undisturbed by humans. It is helpful, though not essential, to have good visibility across the floodplain. A clear view of the sky (limited hills & tree foliage) is helpful if you plan to use GPS.

Equipment needed:

Teaching Materials

Sample lab notes using GIS (Microsoft Word 40kB Feb22 05) -- Instructions are provided to incorporate GIS and GPS options into the field experience. GIS elements are noted with superscripts for easy editing depending on what resources are available.
Original sample lab notes (Acrobat (PDF) 88kB Mar10 04) (without GIS)

Teaching Notes and Tips

Scout the area ahead of time to locate a place for the topographic profile and soil cores that has these characteristics: approximately perpendicular to the river and floodplain margin, reasonable visibility along the line, typical of the area.

Determine what maps you would like the students to create before the lab and how they will create them (data source, scale, etc.). Online sources such as the USGS/Microsoft Terraserver site produce topographic maps and aerial photos. Otherwise the data resources and default map file should be created in advance if desktop GIS software will be used before or after the lab. The GIS version of the sample hand-out notes provides basic instructions on each GIS and geologic aspect of the lab. The file can be edited to remove any components that are not feasible within your goals/resources for the lab. Students may require additional instructions on downloading image files from the web and inserting the images into word-processing software.

Students will expect that the local slope across the floodplain will be from the floodplain margins toward the river. On unmodified floodplains, with streams that overtop their banks every other year or so, the topographic profile will contain a higher area adjacent to the stream channel (the levee). It's common for the lowest part of the floodplain to be near the margins, not near the river. You can start the lab indoors by asking students to draw their conception of what the topographic cross-section will look like, and then return to those sketches at the end of the lab period (or a subsequent class period) to compare their conceptions with reality. This is especially useful if you will have the students develop local topographic maps before the lab.

A primer on how to use the handheld GPS unit is useful. Generally it takes the students about 15 minutes with the GPS receiver to start recording tracks (breadcrumb trails) and waypoints with comfort. Downloading the GPS data can either be part of the student exercise or done by the instructor to create a single compilation of the GPS records. Students with little computer experience may find the downloading process intimidating.

Assessment

For a self-contained lab (no homework required): Use oral reports from groups to assess how well they interpreted their part(s) of the assignments.
At the start of the next class period, ask students to sketch the topographic cross-section and briefly describe the materials in each section and how they formed as an informal writing assignment and/or quiz.

Assessable homework after the lab: Drafted explanatory cross-sections and maps; soil stratigraphic columns, short paper about the relationship between river evolution and the stratigraphy and topography of the floodplain. Include annotated maps marked with the locations of the field observations.

References and Resources

Follow this link (Microsoft Word 40kB Feb22 05) for GIS-enhanced lab notes. GIS elements are noted with superscripts for easy editing.
Follow this link (Acrobat (PDF) 88kB Mar10 04) for original lab notes without GIS.

Also see the following resources:


Subject

Geoscience:Hydrology, Geology, Environmental Science:Ecosystems:Biogeochemical cycling

Resource Type

Activities:Field Activity

Special Interest

GPS, GIS, Field-Based Teaching and Learning

Grade Level

College Lower (13-14):Introductory Level

Earth System Topics

Biosphere:Ecology, Hydrology, Solid Earth

Topics

Hydrosphere/Cryosphere, Energy/Material cycles, Earth surface, Time/Earth History

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