Fluvial channels are inherently three-dimensional features; although challenging to study on two-dimensional outcrops, seismic data provide unique perspectives on their architecture. Alqahtani and others evaluate the geometry, dimensions, distribution and evolution of fluvial channel systems from a humid-tropical climatic setting through detailed analysis of high-resolution 3D seismic reflection data from the Malay Basin. The interpretations reveal eight depositional units that include systematic changes in six types of fluvial channels defined based on cross-sectional and planform geometries. The data provide input for reconstructions of the palaeo-hydrological conditions during Pleistocene sea-level cycles that affected the Sunda Shelf Sea. The manuscript further evaluates the roles that sea-level variations, climate, and sediment supply play on controlling the formation and evolution of fluvial systems, including incised valleys and associated tributary channels.
Controls on the geometry and evolution of humid-tropical fluvial systems: insights from 3D seismic geomorphological analysis of the Malay Basin, Sunda Shelf, Southeast Asia by Faisal A. Alqahtani, Christopher A.-L. Jackson, Howard D. Johnson, and M. Rapi B. Som