Submitted to The Cooperative Institute for Coastal and Estuarine Environmental Technology ( CICEET ) Project Title : A Module for NOAA ’ s GNOME Model to Provide

CDOG (Clarkson Deepwater Oil and Gas) model simulates the behavior of oil and gas released from deepwater. The model integrates the hydrodynamics of the jet/plume, the thermodynamics, and the hydrate formation and decomposition. CDOG simulates both the dynamics of the jet/plume phase and the farfield conditions during the rise of oil/gas/hydrates through the water column. CDOG allows gas/hydrates to separate from the main plume if there are strong cross currents. Despite the comprehensive nature of CDOG, it is designed to simulate the oil and gas behavior only until they reach the water surface. CDOG at present does not include weathering processes once oil starts floating on the water surface. No Graphic User Interface (GUI) or data visualization were included in the original CDOG design. GNOME (General NOAA Oil Modeling Environment) is the trajectory model developed and used by NOAA for spill response. GNOME has several user “modes” to allow users of different levels of sophistication to setup and use the model. GNOME is designed to be flexible; allowing the model to use circulation fields from a number of different models in different formats, and includes a number of diagnostic tools. This paper reports the integration of CDOG with GNOME so that users can run CDOG using a GUI and then easily transition to running GNOME for the surface trajectories. This integration allows the users to run complete scenarios – the types that are required in comprehensive contingency planning.