Carling, P.A., Whitcombe, L., Benson, I.A., Hankin, B.G. and Radecki-Pawlik, M.
A new method to determine interstitial flow patterns in flume studies of sub-aqueous gravel bedforms such as fish nests
River Research and Applications, 22, (6), . (doi:10.1002/rra.930).
Full text not available from this repository.
Flume studies often seek to measure and record the interstitial flow within plane-bed sediment bodies and within sediment beds
with wavy surfaces, such as those typified by salmonid fish spawning nests and river-dunes. A simple, inexpensive method is
described to record and map, at discrete points, the spatial variation in interstitial flow speeds in experimental fine gravel beds.
The procedure uses activated carbon granules to capture a tracer: Rhodamine WT dye. Calibration of the uptake of dye by the
carbon for known interstitial flow speeds allows mapping of point flow speed data initially in the nominal x-dimension. Using
interpolation procedures available in a range of commercial ‘mapping’ software packages, the point data can be used to produce
quasi two-dimensional ‘slices’ along sampling planes within the three-dimensional gravel bed. Similarly, three-dimensional
representations can be produced within which lines of equal current speed (‘isovels’) are interpolated such that the flow vectors
(in x, y and z coordinates) may be inferred.
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