Hi everyone, I'm looking for an inexpensive means of estimating or measuring mean interstitial flow velocity within gravel/cobble sized benthic stream sediments. I've looked into heat-pulse groundwater flow meters, but they are expensive, tough to calibrate and not widely used. I'm currently considering deploying gypsum tablets and recording dissolution rates, but these interstitial flow velocities are so low (0.04-0.22 cm/s) that I am not sure this will prove a valuable approach.
Does anyone have any other clever tricks I may not have heard about? I'll consider anything! Many thanks, Ryan Utz Postdoctoral researcher Department of Ecology, Evolution and Marine Biology University of California, Santa Barbara
