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Ground water in the A baione Cove landslide, Palos Verdes Peninsula, southern California

By
Kathleen A. Proffer
Kathleen A. Proffer
WZI Inc., 4800 Easton Drive, Suite 114, Bakersfleld, California 93309
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Published:
January 01, 1992

Abstract

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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Contents

GSA Reviews in Engineering Geology

Landslides/Landslide Mitigation

James E. Slosson
James E. Slosson
Slosson and Associates, 15500 Erwin Street, Suite 1123, Van Nuys, California 91411
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Arthur G. Keene
Arthur G. Keene
2601 E. Victoria Street, #308, Rancho Dominguez, California 90220
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Jeffrey A. Johnson
Jeffrey A. Johnson
Jeffrey A. Johnson, Inc., 12818 Stebick Court, San Diego, California 92130
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Geological Society of America
Volume
9
ISBN electronic:
9780813758091
Publication date:
January 01, 1992

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