River terraces are everywhere! But why do rivers sometimes aggrade a terrace and sometimes incise? Do rivers aggrade because there's more sediment coming in, or because there's less water for sediment transport? We did a case study. A thread
#geomorphology
onlinelibrary.wiley.com/doi/10.1002/es…
#geomorphology
onlinelibrary.wiley.com/doi/10.1002/es…
We investigated two alluvial fan sequences in #Crete, mapped them, did some #radiocarbon and #OSL dating, and measured #cosmogenic 10Be and 36Cl. Both fans roughly span the last glacial cycle, and therefore record large variations in climate.
To correct #cosmogenic nuclide concentrations for post-depositional production, I developed "PostPro". The code computes synthetical burial histories for sedimentary sections, including uncertainties of depth through time and all production uncertainties. github.com/Richard-Ott/Po…
We find that aggradation occurs during dry, and incision during wet climate. Variations in denudation rate through time are minor. Similar to a numerical study by @SebCastelltort, we find that it is not changes in sediment flux but water discharge that control river behavior!
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