Tidally Laminated Sediments

A tidally averaged sediment transport model of san francisco bay was incorporated into a tidally averaged salinity box model previously developed and calibrated using salinity a conservative tracer uncles and peterson 1995.

Tidally laminated sediments.

Gon i 2 and john s. A horizontally laminated black mudstone followed by flaser or lenticularly bedded sandy mudstone and erosively overlain by cross bedded channel sandstone. Subglacial deformation of pre existing sediments may also produce laminated deposits in the form of glacitectonite and deformation till. Laminated glacimarine sediments form by a variety of processes including suspension settling from turbid overflow plumes turbidity current deposition and contour current activity.

Although this result is reasonable when only the three sites are compared both values are lower than predicted by existing threshold models with a. At d2 non cohesive sediment and b4 d1 cohesive sediment the critical shear stresses for seabed erosion or resuspension were estimated to be 0 11 and 0 07 0 09 n m 2 respectively. Published 31 january 2008. Accepted 25 may 2007.

Sediment delivery from the fly river tidally dominated delta to the nearshore marine environment and the impact of el nin o andrea s. Lamina that occurs in sedimentary rocks laminae are normally smaller and less pronounced than bedding lamination is often regarded as planar structures one centimetre or less in thickness whereas bedding layers are greater than one centimetre. One representing the channel 5 meter depth and the other the shallows 0. In geology lamination is a small scale sequence of fine layers laminae.

Revised 3 march 2007. Preston martin 1 miguel a. Two major types of sequences can by destinguished. The bay is represented in the model by 50 segments composed of two layers.

However structures from several millimetres to many centimetres.