title: Field observations of dilution on the Ipanema Beach outfall.
abstract: Field observations of the Ipanema Beach, Rio de Janeiro, ocean sewage outfall are presented. Measurements of dilution and other wastefield characteristics were obtained by adding dye tracer to the effluent and measuring in-situ. Simultaneous measurements of oceanographic conditions were made by Acoustic Doppler Current Profilers, thermistor strings, and profiling instruments. Four experiments were performed, two during unstratified conditions when the plume was surfacing, and two during conditions of strong stratification when the plume was submerged. The minimum dilution varied from 30 to 130. The measurements reflect the worst case conditions as the campaigns were all made for weak currents.
authors.affiliation: COPPE/UFRJ-Federal Univ. of Rio de Janeiro, Cidade Univers., CT-bl I. Rio de Janeiro, Brazil 21945 970. roldao@acd.ufrj.br
authors.forename: J
authors.initials: J
authors.lastname: Roldão
authors.forename: J L
authors.initials: JL
authors.lastname: Carvalho
authors.forename: P J
authors.initials: PJ
authors.lastname: Roberts
mesh_terms: D000465:Algorithms; D001493:Bathing Beaches; D001938:Brazil; D004396:Coloring Agents; D004301:Doppler Effect; D006358:Hot Temperature; D009791:Oceanography / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D012623:Seawater / Q000032:analysis; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D013016:Sound; D014872:Water Movements; D018508:Water Purification / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: D004396:Coloring Agents; D012722:Sewage