Fundamental response of pore-water pressure to microfabric and permeability characteristics: Eckernförde Bay |
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| Authors: | R H Bennett M H Hulbert M M Meyer D M Lavoie K B Briggs D L Lavoie R J Baerwald W A Chiou |
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| Institution: | (1) Marine Geosciences Division, Naval Research Laboratory, Stennis Space Center, 39529, Mississippi, USA;(2) Resource Dynamics, 226 Windjammer Lane, 60030 Grayslake, Illinois, USA;(3) Oceanography Division, Naval Research Laboratory, Stennis Space Center, 39529, Mississippi, USA;(4) Department of Biology, University of New Orleans, 70148 New Orleans, Louisiana, USA;(5) Department of Material Science, Northwestern University, 60208 Evanston, Illinois, USA;(6) Present address: Seaprobe, Inc., 501 pine 34, 39466 Picayane, MS, USA |
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| Abstract: | Ambient and dynamic in situ pore pressures were measured, and microfabric was examined in finegrained, shallow-water sediment in Eckernförde Bay, Germany. In situ permeabilities were calculated from piezometer data. Pore-water pressure decay times in sediments 0.5–1.0 m subbottom are indicative of clayey materials. Shallower sediments, although of similar classical grain size as the deeper sediments, have quicker decay times typical of silty marine sediment. Pore pressure response is a function of the microfabric, porometry, and sediment permeability. Aggregates (composed of fine-grained material, biota, and extracellular polymers) produce large pores and complex microstructure, resulting in effective permeabilities characteristic of silts. |
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