We use C-org and d 13 C to trace the origin of the alluvium deposited on the Waipaoa River floodplain at McPhail's Bend between 1853 and 2002. The overbank deposits exhibit a more positive range of d 13 C values (À26.3 ± 0.6) than contemporary suspended sediment in transport at intermediate flows (À27.8 ± 0.2) when gully erosion releases most material to stream channels, reflecting the greater contribution made by shallow landsliding in the headwaters during large precipitation events. Overbank sediment a…
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