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Seafloor, sea-level, shear zones, subduction, sedimentation, and seismology
Date:1/14/2014

taper model. Surface material removal is controlled mainly through rainfall and runoff, and because the lithology, erodibility, and rock mechanical properties are relatively homogeneous in the Sub-Himalaya, erosion factors, in particular, precipitation and discharge, are deemed the principal controls on wedge width. We conclude that climate-induced erosion is the principal control on Himalayan fold-and-thrust belt morphology.


Is river avulsion style controlled by floodplain morphodynamics?
E.A. Hajek, Department of Geosciences, Pennsylvania State University, 511 Deike Building, University Park, Pennsylvania 16803, USA, hajek@psu.edu; and D.A. Edmonds, Department of Geological Sciences and Center for Geospatial Data Analysis, Indiana University, 1001 East 10th Street, Bloomington, Indiana 47405, USA. Posted online 10 January 2014, http://dx.doi.org/10.1130/G35045.1.

River relocation, or avulsion, is an important process that distributes sediment, water, and nutrients across landscapes, and can be the cause of unexpected flooding hazards. Two distinct end-member avulsion styles have been observed: one where significant sedimentation occurs on a floodplain as a new river channel is built, and another where a new channel is excavated or eroded into the floodplain. This study explores the degree to which floodplain conditions can be used to predict how new channels form during river avulsion. By comparing generalized floodplain erosion and deposition rates in a given system, it may be possible to predict the likelihood of deposition- or erosional-style river avulsions. This broad rate comparison is shown to explain trends in a series of numerical models and is also consistent with data from ancient river deposits. These results demonstrate that understanding deposition and erosion patterns on floodplains may be useful for anti
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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