In this shelf-edge basin, successive fluvial cycles repeatedly reworked the uppermost parts of earlier fluvial deposits such that only the lowermost channel lags tend to be preserved.
The small-scale fluvial cycles originated through autogenic mechanisms, predominantly as a result of repeated channel avulsion processes that occurred concurrently with on-going subsidence and the progressive generation of accommodation.
By contrast, in the eastern Irish Sea Basin of west Cumbria, the rate of sediment accommodation generation was substantially greater (119 m/Myr) such that space was available to preserve complete fluvial cycles, including silty drape units that cap the channelized deposits.
Fluvial cycles may take the form of autocycles, caused by floods and avulsion, and allocycles, representing external forces, such as climate, tectonics, and base-level changes (Xu et al., 1996a, b; Nádor et al., 2003).
Based on the model of climate controlling fluvial cycles in the Beijing Plain, we suggest that the higher inputs of magnetic minerals, as a result of increasing precipitation, resulted in higher values of k and SIRM in the interglacial periods and that decreasing precipitation in the glacial periods reduced the inputs of magnetic minerals, resulting in lower values of k and SIRM.
The stagnant layers always overlie the erosional bases and are located at the bottom of fluvial sedimentary cycle.
It was observed from the HI value that the basin falls under mature stage of fluvial geomorphic cycle.
The study reveals that the Budigere Amanikere basin is passing through a mature stage of the fluvial geomorphic cycle.
Nevertheless, the main fluvial sedimentary cycle in the Tianzhu borehole represented by alternations between sand/silt and silty clay was mostly controlled by allocycle processes.
Hypsometric curve and hypsometric integral study reveals for sub-watershed as well as entire watershed is passing through a mature stage of the fluvial geomorphic cycle.
