Historical Sediment Budget Analysis of the Malibu Coastline

by Reinard T. Knur, California State University, Los Angeles, LA, United States,
Young C. Kim, California State University, Los Angeles, LA, United States,



Document Type: Proceeding Paper

Part of: Sand Rights '99: Bringing Back the Beaches

Abstract:

Sediment supply to the Malibu coastline has been continually decreasing since development began in the Santa Monica Mountains in the 1880's due to dam construction for irrigation and recreation, and coastline armoring to protect private property and public roads. The average annual sediment supply from Malibu Creek, the largest point source of sediment to the Malibu coastline, has been reduced approximately 54% due to dam construction in the watershed. The average annual sediment supply to the Malibu coastline from all sources has been reduced approximately 38% due to development. Conversely, sediment has been recharged by hillside cuts made during the construction of Pacific Coast Highway (PCH). The purpose of this study is to compare the average annual quantities of sediment yielded to the coast during pre-development and present conditions.

Subject Headings: Sediment | Infrastructure construction | Shores | Dams | Watersheds | Offshore construction | Budgets | California | United States

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