--> Abstract: Interactive Simulation of Delta-Building Processes, by C. Ramshorn and J. W. Harbaugh; #90987 (1993).

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RAMSHORN, CHRISTOPH, and JOHN W. HARBAUGH, Stanford University, Stanford, CA

ABSTRACT: Interactive Simulation of Delta-Building Processes

SEDSIM (Stanford's SEDimentary Basin SIMulation project) simulates geologic processes that create deltas in three dimensions. Processes include transport and deposition of clastic sediment by streams and longshore transport by waves. In experiments, the user defines the initial topography of a basin, the discharge rates of rivers that enter it, the direction and intensity of waves, and the span of geologic time to be represented. Sea level can be raised or lowered, river discharge rates adjusted to represent floods or droughts, and wave intensity and direction changed to represent storms. SEDSIM responds by producing deposits and seafloor

topography in keeping with processes and rates. Alternative stratigraphic sequences can be generated for comparison with actual sequences interpreted from seismic and well data.

VisualSedsim is a SEDSIM module that permits interactive viewing and control of simulations. Geologic features are viewed with animated contour maps and 3-D diagrams, and currents in streams and nearshore waters are shown with moving symbols or vectors. Types and quantities of sediment are color coded while being transported. The user can change parameters interactively and the effects of changes are immediately visible as SEDSIM responds. Snapshots of an evolving basin can be stored and viewed with shaded-relief models, translucent see-through displays, and intersecting fence diagrams. Composition of deposits and geologic ages are displayed dynamically and interchangeably, permitting evolutionary changes in a delta complex to be viewed in video-like form. The ability to watch sedimen ary processes and features simultaneously provides heightened insight into the interdependencies between them.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.