1. ROMS modeling of stormwater plumes and anthropogenic nitrogen inputs in the SCB Eileen Idica (edeng@ucla.edu)edeng@ucla.edu PhD candidate, Dept Civil & Env Engineering, UCLA Advisor: Keith Stolzenbach Regional Oceanic Modeling System (ROMS) SCB Configuration 1 km horizontal resolution 40 vertical levels surface forcings ◦ momentum (MM5) ◦ freshwater and heat fluxes lateral boundary fluxes from larger US West Coast ROMS solution anticipated to have 1996-2003 6-hourly solutions

2. Analytical, one-day storm event 500 cms daily mean flow Salinity of discharge is zero Passive tracer released with discharge Half-Gaussian vertical input profile Example: Los Angeles River stormwater discharge simulation Would like to determine plume dynamics within a range of ocean forcings model suspended sediments, settling, and sorption in stormwater discharge investigate relative space and time scales in which these processes affect transport of contaminants carried by the stormwater plume

3. Impact of anthropogenic nitrogen to the Southern California Bight Use ROMS and ecosystem model to simulate: i) low upwelling year (1997-1998) ii)high upwelling year (2001-2002) i) only upwelled nitrogen ii) “natural” land input of nitrogen iii) existing stormwater and wastewater inputs (18 major rivers, 4 largest treatment facilities) ROMS ecosystem model (Gruber et al. 2006) What, if any, biological “signal” will we observe in the set of simulations from anthropogenic inputs, and on what spatial and time scales?