Autoretreat of a Delta in a Flume

Provided by: Tetsuji Mujto (Nagasaki University)

Total Time: = 1'16" (XX Mb)

Experimental results showing autoretreat of a delta under steady state conditions of sea level rise, sediment discharge, water discharge and flume slope (see first frame). Note that the delta elongates by prograding (downstream) and onlapping (upstream). Onlap is needed to build a sufficient slope to transport sediment to the delta front. Eventually the delta becomes too elongate for the sediment supply to maintain the needed slope to feed the delta front. At this point transgression begins (autoretreat) as onlap continues.

References

Muto, T., and Steel, R. J., 2001, Autostepping during the transgressive growth of deltas: Results from flume experiments: Geology, v. 29, no. 9, p. 771-774.

Muto, T., and Steel, R.J., 2004, Autogenic response of fluvial deltas to steady sea-level fall: Implications from flume-tank experiments: Geology, v. 32, no. 5, p. 401-404.

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