Draft Strategy Revised RMP Modeling Strategy John Oram Jay Davis Item #8

Draft Strategy Revised Intent To develop a capacity to predict the effect of different management alternatives on –loads from watersheds, –the recovery of contaminated areas on the Bay margin, –the recovery of the Bay as a whole Item #8

Draft Strategy Revised Approach To develop conceptual and numeric models of the physical, chemical, and biological processes governing the fate of water, sediment, and pollutants of concern in San Francisco Bay and its associated watersheds Item #8

Draft Strategy Revised Question 1 : Bay Margins What is the contribution of contaminated Bay margins to impairment in the Bay and what are the projected impacts of management actions to the Bay's recovery? Item #8

Draft Strategy Revised Question 2 : Bay Recovery What patterns of exposure are forecast for major segments of the Bay under various management scenarios? Item #8

Draft Strategy Revised Question 3 : Small Tributary Loads What are the projected impacts of management actions on loads or concentrations of pollutants of concern from the high-leverage small tributaries? Where should management actions be implemented in the region to have the greatest impact? Item #8

Draft Strategy Revised Strategy : Coordination Establish a Bay Area Modeling Forum that will –guide agencies and NGOs in the selection, use, and interpretation of models for describing sediment-water relationships in fluvial and tidal systems –improve communication and coordination of local modelers and stakeholders –reduce duplication of efforts –improve the overall quality of modeling products Item #8

Draft Strategy Revised Strategy : Bay & Margins Model Develop a flexible grid model capable of implicitly allowing for the interaction of fine-scale processes occurring at the Bay Margins with the larger-scale processes of the Bay proper Item #8

Draft Strategy Revised Strategy : Bay & Margins Model What is a flexible grid anyway? –An approach to allow increased resolution in areas of concern Item #8

Draft Strategy Revised Strategy : Bay & Margins Model # cells44,148 cell sizeCurvilinear 50 m to 1.3 km dt (min) Curvilinear Grid Delft3d grid from P. Barnard (USGS) Item #8

Draft Strategy Revised Strategy : Bay & Margins Model SUNTANS grid of Puget Sound Unstructured Grid Item #8

Draft Strategy Revised Strategy : Bay & Margins Model Some Model Options –Multibox + Good for hypothesis testing - Limited spatial/temporal resolution - Limited ability to calibrate/validate - Limited sediment capabilites –3D Commercial : Delft3D, Mike, TRIM, UnTRIM - Licensing can be costly + Set-up often less complex than open-source + Package Deal - includes pre- and post-processing software + Technical support is available - Black Box –3D Open-Source : ROMS, SUNTANS, … + Freely available +/- State-of-the-art +/- Community Support - Set-up can be challenging +/- Time is largest expense Item #8

Draft Strategy Revised Strategy : Bay & Margins Model What is SUNTANS? –Stanford Unstructured Nonhydrostatic Terrain- following Adaptive Navier-Stokes Simulator –Next generation of coastal models –Co-developed in SF Bay by Stanford and UC Berkeley –Open-Source –Includes water, sediment, contaminant capabilities –Accounts for tidal wetting/drying –Ocean boundary condition can be driven by ROMS Item #8

Draft Strategy Revised Strategy : Local Watersheds Develop models of key watersheds over the next three years with the goal of developing a regional model (or set of models) Watersheds will be identified by SPLWG and Small Tributaries Strategy Team –These groups will provide project oversight as well. Item #8

Draft Strategy Revised Model Proposal What: Development of a highly-resolved three- dimensional model of South Bay Who: Mark Stacey (UCB), Rusty Holleman (UCB), Ed Gross (Consultant), John Oram (SFEI) Why: Project would provide support for a UCB graduate student to continue development of South Bay model and would help insure that development is relevant to RMP objectives. Specifics: Aim is to develop flexible grid of South Bay with emphasis on 1 or 2 tributaries (e.g., Guadalupe) and a Bay margin site (e.g., San Leandro Bay). Model will be useful for answering questions related to flushing times and exchange processes (e.g., what is influence of margin on Bay?). Item #8