Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Lowering Water Table

Skip navigational links
Loading
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 14:04 - 15:04 (01:00)
Source: Annenberg/CPB Resources - Earth Revealed - 16. Mass Wasting
Keywords: "Perry Ehlig", landslide, "Portuguese Bend", "Palos Verdes Peninsula", "mass wasting", "geologic hazard", "water table", well, movement, wave, erosion, base, gabion, shore

Our transcription: Perry Ehlig regularly monitors wells that have been installed to drain water from the slide area.
Thus far, lowering the level of the water table is an effort that seems to have paid off.
Measurements made along the edge of the slide indicate that the movement has slowed to a fraction of its former speed.
Ehlig hopes to completely stop the upper portion of the landslide within the next few years.
The lower edge, however, is a different and somewhat more complicated matter.
The problem here is that wave erosion undermines the base of the landslide, which weakens its upslope area further.
Without protection coastal erosion will continue to be a factor contributing to movement.
Rock filled cages called "gabions" have been tested along part of the shoreline successfully reducing the wave erosion and helping to stabilize the slide.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/15.01.15.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:27:00 PDT 2013  (chd)