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A bank erodibility curve is a graph that relates combinations of behi and nbs ratings with actual erosion rates Hydraulic failure is generally characterized by a lack of vegetation, high boundary velocities, and no mass soil wasting at the toe of the slope Repeated measurements at monumented cross sections for representative conditions allow for validations of quantities and rates.
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Eroding streambanks can be a major source of sediment to a stream (up to 80% of the annual load Bank erosion occurs when flowing water exerts a tractive force that exceeds the critical shear stress for that particular streambank material Simon and thorne, 1996), and human activities such as urbanization or dam construction can accelerate bank erosion rates by more than an order of magnitude.
This fact sheet presents common approaches for quantifying streambank erosion rates and loadings, including physical surveys and aerial photo analysis combined with field measurements of streambank height
Instructions are provided for quantifying streambank erosion using the following methods: This method as published by rosgen (2001a) utilizes 1\'10 bank erodibility estimation tools The bank erosion hazard index (be hi), and near bank stress (nbs). Aerial and satellite imagery can be used to measure rates of bank erosion and river channel migration at larger spatial scales by comparing bank locations at various times.
Erosion rates are highly influenced by bank resistance, particularly bank material and vegetation (e.g., schumm, 1963 Hooke, 1979), but vegetation effects have proved difficult to quantify, though research is continuing. Three years of monthly erosion data on 64 streambanks were used to assess the spatial and temporal variability of erosion measurements and subsequently develop the erosion curves Predicted erosion rates were then compared to measured erosion rates on three banks in the valley and ridge of southwest virginia.
