AboutDavid L. Russell, PE Expertise I`m a Chemical,Civil and Environmental Engineer and have a number of projects in all phases of the environment.
I have worked in the chemical industry and am active in professional societies, and am currently on an industrial wastes committee for the Water Environment Federation, and have taught courses in remediation in the US and abroad.
I have written one book on Remediation of petroleum Contaminated Sites, and have a second book on PRACTICAL WASTEWATER TREATMENT to be published by John Wiley in September, 2006. I've also written over 30 articles on various elements of environmental problems and cleanup. Most Recently, I have addressed a NATO Scientific and Techical Conference on Ecoterrorism, and have worked with the same group on remediation of sites contaminated with Chemical Warfare Agent materials and othe materials as well. . I can answer q`s about Chemical and Environmental Engineering, land development, air pollution, water pollution, soil and water cleanup, combustion, international environmental problems, industrial processes chemical processes. Civil and Environmental and Chemical Engineering. Overall, I have over 35 years of experience in this area. Note: I do not answer homework questions
Experience I love work in the third world and developing areas
because it is challenging and one can get a sense of accomplishment.
Could you please describe me what is Sediment Induced Buoyancy Effect?
I cannot understand what does it mean, because Buoyancy is a a fluid force on a submerged body and how Solids like sediment can produce buoyancy?
Thanks,
ANSWER: The effect you describe is caused by the "rapid" downward movement of large groups of sediment. The sediment displaces the water and causes an upwelling effect, mass displacement of the water as it settles, and that in turn causes the bouyancy effect.
Hope that helps.
If you want to see it in action, try dropping a handful of marbles or small shot into a clear glass of water and observe the effect first hand.
Dave
---------- FOLLOW-UP ----------
QUESTION: Dear Dave
I have a problem with calculating Vertical Eddy Diffusivity Km.
As far as I know Km=Ps/S2 ____ _ ____ _
shear production rate Ps=-(u'w'.du/dz+v'w'.dv/dz) and S is the mean shear. (u'w' & v'w' are average values)
I can gather data using a Vectrino Velocimeter, but for using a software like Mathematica I don't know how I should calculate the average values of u'w', v'w', u and v.
thanks
Answer Here's a thought. I'm not totally familar with the velocimeter, but I believe that it resolves the velocity into horizontal and vertical components. (XY&Z axes values). If you are going to apply the differentials, the challenge will be to resolve them into their horizontal and vertical components. Alternatively, why not just use the data from your experiments and put in appropriate variance because the Ps term is already integrated for you from the flowmeter. So use that data directly because it has all the components you need. Then what you have to worry about is the bulk average flow and the instantaneous values.
In that case, I'd probably plot the data and see if I can develop some type of curvlinear relationship by a least squares fit. Then I'd plug that infor Ps with appropriate allowances for variability.
