Reply to comment by F. Boano et al. on 'Pore water flow due to near-bed turbulence and associated solute transfer in a stream or lake sediment bed'

摘要

We thank Boano et al. [2010] for their comments on our article "Pore water flow due to near-bed turbulence and associated solute transfer in a stream or lake sediment bed" [Higashino et al, 2009], Boano et al. raise two issues: (1) scaling of the turbulent flow structures and (2) suitability of the experimental results. Our response is as follows: [2] First we need to reiterate that the pressure pulse model was developed for a sediment bed of fine sand and with no bed forms. The temporal and spatial scales of the near-bed coherent structures were chosen accordingly. Simulated pressure and velocity fluctuations shown in Figures 2, 3, and 4 of Higashino et al. [2009] penetrate several centimeters deep into the sandy sediment bed and are not filtered out within the first four grain diameters as implied by Boano et al. [2010]. The spatial and temporal scales (equations 1-3 of Higashino et al. [2009]) of the coherent turbulent structures on a smooth surface were therefore applied correctly.