The effects of the moss Fissidens rigidulus (Fissidentaceae: Musci) on near-bed flow structure in an experimental cobble bed flume

Article Abstract:

Near-bed flow structure was affected by the aquatic moss Fissidens rigidulus in studies involving an experimental cobble bed flume. Two flow layers occurred: an upper logarithmic layer and a lower roughness layer, in which flow interacted with roughness factors. Average longitudinal velocity, Reynolds stress, and total turbulence energy were reduced in the presence of Fissidens, while relative turbulence intensity increased. An internal boundary layer occurred around the moss, and its thickness increased with greater flow.

Streamflow, Moss, Mosses

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Photochemical reactivity of dissolved lignin in river and ocean waters

Article Abstract:

The composition and reactivity of terrigenous dissolved organic matter (DOM) in the ocean is significantly affected by photochemical reactions. Riverine dissolved lignin is photochemically altered by photooxidation in a manner consistent with the make-up of oceanic dissolved lignin. Dissolved lignin found in high-molecular-weight DOM in the equatorial Pacific Ocean is very resistant to photooxidation.

Composition, Mississippi River, Lignin, Photochemistry, Sea-water, Seawater

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