Ground water in the A baione Cove landslide, Palos Verdes Peninsula, southern California
Kathleen A. Proffer, 1992. "Ground water in the A baione Cove landslide, Palos Verdes Peninsula, southern California", Landslides/Landslide Mitigation, James E. Slosson, Arthur G. Keene, Jeffrey A. Johnson
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The Abalone Cove landslide, in southern California, is an 80 acre (32 ha) landslide within an ~870 acre (348 ha) ancient landslide complex. The landslide has developed in seaward-dipping marine strata of the middle Miocene Monterey Formation. The lower part of the landslide began moving by February 1974; the upper part did not appear to start moving until the spring of 1978. Since 1980, landslide movement has been con-trolled by the removal of ground water from the landslide mass.
During years of nearly normal rainfall, subsurface inflow was the major source of ground water, contributing 55%. Percolation of rainfall and of delivered water were second and third, contributing 22% and 19%, respectively. During years of nearly twice normal rainfall, percolation of rainfall was the major source of ground water, contributing 56%. Subsurface inflow, percolation of delivered water, and surface inflow contributed 27%, 9%, and 8%, respectively.
Prior to the installation of seven dewatering wells, the major loss of ground water was discharge to the surface by seeps at the toe of the landslide. The seeps accounted for 81% of the ground-water disposal. During the last two years of the study when the dewatering system was fully operational, surface seeps accounted for 34% of the ground-water disposal and pumping accounted for 54%. Other sources of ground-water disposal were evapotranspiration and subsurface outflow.
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Provides a variety of case histories, methodology to help identify, quantify, and mitigate landlsides, and legal cases affecting engineering geology. Part I provides basic information to aid in assessing geologic hazards related to compound landslides, surficial slope failures, and causes of distress to residential construction. Includes changes in the law relating to geologic investigations and disclosure of geotechnical information. Part II is a cross section dealing with recent significant landslides related to a single storm, intense rainfall, possible errors in the identification of and development on an existing or paleolandslide, and the use of pumping wells and horizontal drains to dewater slope failures. Also discusses how proper installation and use of drains prevent paleolandlsides from causing damage to modern facilities.