2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/05/2017  |   3:30 PM - 3:45 PM   |  IN RIVERS SEDIMENT SURFACE AREA IS GREATER IN THE WATER COLUMN THAN THE BENTHOS   |  302B

IN RIVERS SEDIMENT SURFACE AREA IS GREATER IN THE WATER COLUMN THAN THE BENTHOS

Ecosystem processes for large rivers are often scaled up based on measurements from small streams. However, there are fundamental differences in the properties of rivers and streams. For example, along a river continuum the water column may become the locus of activity for certain processes compared to the benthos. Beginning with the physical template, we quantified the ratio of sediment surface area in the water column versus the benthos (R_SA) with a simple model based on hydrogeomorphic principles. We used suspended sediment, discharge, and channel dimensions data from 10 major rivers as model input. We show that R_SA increased as a power function of watershed area and varied over six orders of magnitude (10^-4 to 10²; R_SA > 1 indicates greater sediment surface area in the water column than benthos). At median discharge, R_SA was eventually greater than 1 in all ten rivers; this location occurred in 6^th order rivers on average.

• C14 Hydroecology
• C31 Organic Matter Processing
• C06 Large River Ecology

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Presenters/Authors

John Gardner (), Duke University, john.r.gardner@duke.edu;

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Martin Doyle (), Duke University, martin.doyle@duke.edu;

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