Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Implications of Harbor Dredging for the Santa Barbara Littoral Cell
Sand moves along the coast of California under the influence of waves, feeding California's intensively used beaches. The consequences of interrupting the "river of sand", or littoral drift, traveling along the coast are often adverse and detrimental to the adjacent shoreline. Reductions in the natural sand supply due to damming rivers or armoring cliffs also have serious implications for California's shoreline, and have become a major concern for coastal management. A regional understanding of littoral cell boundaries and sand budgets is a useful tool in coastal land use management and coastal engineering, and it is an essential step in understanding sand routing along the coast. Although sand inputs to littoral cells from coastal streams and from cliff erosion are difficult to quantify accurately due to both spatial and temporal variations in the key quantities that need to be measured, long-term average annual dredging volumes can provide useful data on littoral drift rates at specific locations within littoral cells. Many harbors function as efficient littoral drift traps such that average annual dredging volumes are among the most representative and reliable values we have for the littoral drift rates within individual littoral cells. Using harbor dredging records as a proxy, littoral drift rates for the Santa Barbara littoral cell at Santa Barbara, Ventura, and Channel Islands harbors are as follows: 300,000 yd3/yr, 600,000 yd3/yr, and a minimum of 1,000,000 yd3/yr respectively. Each successive down-drift harbor in the Santa Barbara littoral cell dredges the same sand that was previously removed from the up-drift harbor(s), at great expense. These harbors, which in most cases are complete barriers to littoral drift, are important indicators of the regional health of a littoral cell. Historic harbor dredging records should provide evidence of any significant long-term reductions in the sand supplied to the Santa Barbara littoral cell.
Implications of Harbor Dredging for the Santa Barbara Littoral Cell
Sand moves along the coast of California under the influence of waves, feeding California's intensively used beaches. The consequences of interrupting the "river of sand", or littoral drift, traveling along the coast are often adverse and detrimental to the adjacent shoreline. Reductions in the natural sand supply due to damming rivers or armoring cliffs also have serious implications for California's shoreline, and have become a major concern for coastal management. A regional understanding of littoral cell boundaries and sand budgets is a useful tool in coastal land use management and coastal engineering, and it is an essential step in understanding sand routing along the coast. Although sand inputs to littoral cells from coastal streams and from cliff erosion are difficult to quantify accurately due to both spatial and temporal variations in the key quantities that need to be measured, long-term average annual dredging volumes can provide useful data on littoral drift rates at specific locations within littoral cells. Many harbors function as efficient littoral drift traps such that average annual dredging volumes are among the most representative and reliable values we have for the littoral drift rates within individual littoral cells. Using harbor dredging records as a proxy, littoral drift rates for the Santa Barbara littoral cell at Santa Barbara, Ventura, and Channel Islands harbors are as follows: 300,000 yd3/yr, 600,000 yd3/yr, and a minimum of 1,000,000 yd3/yr respectively. Each successive down-drift harbor in the Santa Barbara littoral cell dredges the same sand that was previously removed from the up-drift harbor(s), at great expense. These harbors, which in most cases are complete barriers to littoral drift, are important indicators of the regional health of a littoral cell. Historic harbor dredging records should provide evidence of any significant long-term reductions in the sand supplied to the Santa Barbara littoral cell.
Implications of Harbor Dredging for the Santa Barbara Littoral Cell
Runyan, Kiki (Autor:in) / Griggs, Gary (Autor:in)
California and the World Ocean 2002 ; 2002 ; Santa Barbara, California, United States
California and the World Ocean '02 ; 121-135
16.03.2005
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Implications of Harbor Dredging for the Santa Barbara Littoral Cell
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