The central Texas shelf is a low gradient (1.2 m/km) shelf, from the shoreface to the 100 m isobath and is wave-dominated. An inherent cyclicity in sedimentation on the shelf is due in part to the curvature of the coastline and the nature of longshore current transport. Presently, predominant wind direction is from the southeast, setting up onshore directed winds which strike the east and south Texas shelves at oblique angles. These asymmetric waves generate longshore currents which transport fine sands to the central Texas shelf.

Through the last glacial eustatic cycle (highstand Stage 5e to present), three discrete highstand prograding shorelines were deposited on the central Texas coast. The interplay between sediment supply, longshore current transport of sands from the east and south Texas shelves, as well as the rate of sea-level rise and fall appear to be the controlling factors on shoreline configuration and preservation potential. See Eckles et al. (2004) for greater detail.

Click on seismic line numbers for images.

Near-shore core dataset

Evolution of the Central Texas shoreface
Central Texas versus East Texas shoreface preservation potential

Offshore dataset

Highstand systems tract

Lowstand systems tract

Transgressive systems tract

Controlling factors on shoreline configuration

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