Locating discharge trajectories in still and moving ambient fluids

Citation
Mj. Davidson et Kl. Pun, Locating discharge trajectories in still and moving ambient fluids, J HYDR ENG, 126(7), 2000, pp. 513-524
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
0733-9429 → ACNP
Volume
126
Issue
7
Year of publication
2000
Pages
513 - 524
Database
ISI
SICI code
0733-9429(200007)126:7<513:LDTISA>2.0.ZU;2-C
Abstract
The angular momentum principle is employed to locate the trajectories of wa stewater plumes. This momentum-based method differs from the traditional ap proach where a perturbation analysis, based on the centerline velocities, i s employed for locating discharges. Evidence of the latter can be found in existing Eulerian-integral and length-scale models. The momentum-based meth od is incorporated into the hybrid model SD3D, where the regional flow solu tions are modified to incorporate the influences of relatively small compon ents of momentum on the discharge trajectory. This method provides a clear understanding of the factors that influence the location of the discharge. The momentum-based approach yields analytical trajectory solutions in many cases, and it eliminates the need to arbitrarily select the appropriate cha racteristic velocity for locating the flow. Comparisons are made with avail able experimental data, and they show that the momentum-based method provid es accurate predictions of the flow trajectories under a variety of dischar ge conditions. Comparisons are also made with predictions from the CORMIX1 and JETLAG models. Zn general the predictions are consistent, but some impo rtant discrepancies are highlighted. The use of the momentum-based method f or locating discharges is discussed in light of recent experimental studies .