Useful links for the fluid transport devotee.
E-Fluids — good educational site for fluid dynamics (with an impressive gallery of flow images)
Image Gallery — Laminar/Turbulent Flows — another impressive gallery of flow visualization images, this time from the University of Iowa
Socolofsky and Jirka text, 3rd edition — a draft version of a textbook on environmental fluid mechanics by Scott A. Socolofsky of Texas A&M University and Gerhard H. Jirska of the University of Karlsruhe
Cushman-Roisin course notes — very helpful course notes from Dartmouth professor Benoit Cushman-Roisin's Environmental Transport and Fate class. Chapters 1, 2, 3, and 4 cover mass balance, diffusion, dispersion, and air-water exchange among other topics
Central limit theorem — animations produced by Charles Annis Statistical Engineering that demonstrate the central limit theorem for various initial particle distributions
Random walk — background on the random walk model from QuantNotes
Brownian motion — Wikipedia entry for Brownian motion, including its history, the mathematical model that represents it, and a 2D example