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The delta was studied to determine the time scale and mechanisms by which river sand was incorporated into the longshore transport regime. The results are pertinent to sediment management on coasts with Mediterranean type climates and drainages. On such coasts, generally, rivers supply most of the littoral sand yet the bulk of this supply accompanies large infrequent floods. In contrast, the nearshore transport processes operate with much greater continuity and regularity. The delta studied was built by a 30-year return period flood at the mouth of the San Lorenzo River. The peak discharge at the river mouth during this flood was about 1,100 cu m/sec. The river drains an area of 357 sq km on the northern shore of Montertey Bay. There, most wave energy arrives as swell from the northwest and, except during brief flood periods, it dominates the river outflow. As a result, the San Lorenzo delta is an ephermeral feature. The study extended two years: in both years the river's supply of sand and gravel was about 300,000 cu m ten times its mean annual supply and equivalent to almost twice the mean annual net longshore transport past the mouth. Methods of investigation included: surveys of nearshore topography, estimates of the river's littoral sediment yield using river flow data and river channel surveys, and estimates of the longshore variation in longshore-transport potential using a wave refraction program. The surveyed sand level changes provided a means of tracing bulk sand movements. The longshore transport predictions were used to confirm the direction of sand movement.
The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics
Section 1 deals with surficial seafloor mapping and characterization. Sections 2 and 3 deal with fundamental geologic and oceanographic processes that introduce, transport, and deposit sediment particles and contaminants in the Southern California Bight.T
This book celebrates the professional career of Harold Reading, who has played a leading role in the development of the IAS, and has been at the roots of the development of 'facies sedimentology' as an art in itself and as a major tool in the broader field of geology. This special collection of original research papers from Harold Reading's students covers the wide range of his research interests and reflects the power of facies sedimentology today. State-of-the-art research papers in the important field of facies sedimentology * a festschrift to one of the great names in sedimentology.