Longshore Sand Transport Study at Channel Islands Harbor, California.
COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA
Pagination or Media Count:
A field experiment was conducted to develop correlations between wave characteristics and longshore sediment transport. The waves were measured by two near-bottom mounted pressure transducers and by visual observation when pressure transducers were not in operation. The average longshore sediment transport rates were determined from sequential volumetric surveys behind an offshore breakwater which was regarded as a total trap. The data analyzed encompass a period of 2 years, 1 year after each dredging cycle. Spectral analyses of the pressure gage wave data were conducted and yielded one direction per frequency. The correlations include immersed weight sediment transport rate, I, versus longshore component of wave energy flux at breaking, P sub ls. The most widely used correlation constant, K, in the relationship I KP sub ls is 0.77. The value determined from the data was K 0.98, based on the P sub ls values directed toward the trap. One feature of this type of trap is the potential for overtrapping if the waves are directed nearly normal to shore. Author
- Physical and Dynamic Oceanography
- Civil Engineering