Geomorphology and sediments of the nearshore continental shelf : Miami to Palm Beach, Florida / by David B. Duane, Edward P. Meisburger.

Abstract

Woods Hole Oceanographic Institution The Continental Shelf bordering southeastern Florida between Palm Beach and Miami was surveyed by the U. S. Army Coastal Engineering Research Center to locate and evaluate sand deposits potentially usable for shore protection and restoration projects. Survey data covered that portion of the Continental-Shelf between 15-and 100-foot depths, and consisted of seismic reflection profiles and sediment cores of the sea floor and shallow subbottom strata. South of Boca Raton to Miami, much of the shelf is essentially rocky with a thin sediment veneer. Relatively thick deposits of sediment have accumulated locally in troughs on the shelf surface formed between low reef-like ridges lying parallel to shore. Shelf sediments south of Boca Raton consist almost entirely of sand-size calcareous skeletal fragments. North of Boca Raton to Palm Beach, most of the shelf is overlain by a thick blanket deposit of homogeneous fine-to-medium, gray sand about half of which consists of quartz particles and the remainder of calcareous skeletal fragments. A total volume of 201 million cubic yards of sand-size sediment occurs on the shelf south of Boca Raton. Although generally suitable for beach fill in terms of size, degradation of size by abrasion and fragmentation of the delicate particles may occur in the shore environment. More than 380 million cubic yards of sand-size sediment lies on the shelf north of Boca Raton. However, because of its fine size, this sand is not considered ideally suited for use on local beaches. In terms of potential as beach sand, sand size sediment from the shelf bordering southeastern Florida is of marginal quality. FOREWORD This report is the first of a series which will describe CERC's Sand Inventory Program.

On the nonlinear interaction between global teleconnection patterns

“…Another feature of the main teleconnection patterns is the interaction between particular oscillations. This interaction appears to be nonlinear and seems, to some extent, to be partially synchronized chaos (as was found by Duane et al (1999) for the northern and southern hemisphere blocks). For such a complex system, the only possibility for realistic modelling seems to be when only a few of the various mechanisms become prevalent in the process, so that the system dynamics are simplified with a corresponding reduction in the number of the effective degrees of freedom.…”

Impairment of excitatory amino acid transporter activity by oxidative stress conditions in retinal cells: effect of antioxidants

“…We have previously reported that ascorbate/Fe2-induced oxidative stress potentiates the NMDA-receptor activity due to the release of AA (17). Free arachidonic acid was shown to inhibit the activity of the glutamate transporter by binding either to the transporter protein or to the protein-lipid boundary (34,54,55). However, arachidonic acid seems not to be involved in the inhibition of D-[3Hlaspartate uptake under the oxidative stress conditions used here, since the preincubation of cells with the PLA2 inhibitor ONO-RS-082 or the fatty acid chelator BSA had no significant effect on the activity of the transporter, both in control and in peroxidized cells (Fig.…”

Geomorphology and sediments of the Chesapeake Bay entrance

“…The exploration program is conducted through the U. S. Army Coastal Engineering Research Center (CERC) . An initial phase in developing techniques for transferring offshore sand to the beach is described by Mauriello (1967) the information collected in the conduct of the research program toward the CERC mission, especially in terms of Continental Shelf structure (Meisburger and Duane, 1969), Continental Shelf Sedimentation (Field, Meisburger and Duane, 1971), and its potential application to historical geology and engineering studies of the shelf, the sand inventory program is now referred to as the Inner Continental Shelf Sediment and Structure Program (ICONS).…”