Field and laboratory observations of bed stress and associated nutrient release in a tidal estuary

TitleField and laboratory observations of bed stress and associated nutrient release in a tidal estuary
Publication TypeJournal Article
Year2015
AuthorsWengrove, M, Foster, D, Kalnejais, L, Purcuoco, V, Lippmann, T
JournalEstuarine, Coastal, and Shelf Science
Volume161
Pages11-24
Date PublishedApril 29
PublisherElsevier
Keywordsbenthic-palagic coupling, esturarine geochemistry, excess shear stress, sediment erosion, sediment nutrient release, sediment resuspension

Nutrient release driven by sediment resuspension in a shallow coastal estuarine system is examined with field observations of bed stress and bed elevation, coupled with laboratory erosion experiments on sediment cores. Two field experiments were conducted over near-cohesive muddy-sand sediments in the Great Bay Estuary, New Hampshire. In the first deployment, boundary layer development during typical summer tidal forcing was observed, while the second deployment occurred under enhanced wind forcing of Tropical Storm Irene. In situ bed stress and erosion depths were estimated with a profiling acoustic Doppler velocimeter. Sediment cores were subjected to EROMES erosion chamber experiments to determine erosion depth and nutrient release as a function of applied shear stress. Results show erosion depths are consistent with in situ observations over shear stresses ranging from 0.10 N m

DOI10.1016/j.ecss.2015.04.005
Refereed DesignationRefereed