PREDICTIVE CAPABILITIES IN OXYGEN-TRANSFER AT HYDRAULIC STRUCTURES

Field measurements of oxygen transfer at four types of hydraulic struc tures are compared to predictions by 12 equations in the literature. T he hydraulic structures were divided into weirs, spillways (gated and ungated), gated sills, and gated conduit outlets. For weirs, it was fo und that Avery and Novak's equation provides the best prediction of ox ygen transfer. Rindels and Gulliver's equation and Wilhelms's equation provide the best prediction for spillways and gated sills, respective ly. No equation provided an acceptable prediction of oxygen transfer a t gated conduit outlets, probably because of the variety of hydraulic conditions that exist in these structures. The prediction of the trans fer of other compounds from these equations also was discussed. It app ears that it is currently possible to predict the transfer of another volatile compound from these oxygen transfer equations at these types of hydraulic structures, as long as the dimensionless Henry's law cons tant is greater than 10. The uncertainty of the prediction, however, w ould increase.