Imperial College London
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DrDylanRood

Faculty of Engineering, Department of Earth Science & Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 7461d.rood

 
 
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Location

 

4.43Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Portenga:2017:10.1002/2016JF004052,
author = {Portenga, EW and Bishop, P and Rood, DH and Bierman, PR},
doi = {10.1002/2016JF004052},
journal = {Journal of Geophysical Research. Earth Surface},
pages = {513--527},
title = {Combining bulk sediment OSL and meteoric Be-10 fingerprinting techniques to identify gully initiation sites and erosion depths},
url = {http://dx.doi.org/10.1002/2016JF004052},
volume = {122},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Deep erosional gullies dissect landscapes around the world. Existing erosion models focus on predicting where gullies might begin to erode, but identifying where existing gullies were initiated and under what conditions is difficult, especially when historical records are unavailable. Here we outline a new approach for fingerprinting alluvium and tracing it back to its source by combining bulk sediment optically stimulated luminescence (bulk OSL) and meteoric 10Be (10Bem) measurements made on gully-derived alluvium samples. In doing so, we identify where gully erosion was initiated and infer the conditions under which such erosion occurred. As both 10Bem and bulk OSL data have distinctive depth profiles in different uneroded and depositional settings, we are able to identify the likely incision depths in potential alluvium source areas. We demonstrate our technique at Birchams Creek in the southeastern Australian Tablelands—a well-studied and recent example of gully incision that exemplifies a regional landscape transition from unchanneled swampy meadow wetlands to gully incision and subsequent wetland burial by post-European settlement alluvium. We find that such historic alluvium was derived from a shallow erosion of valley fill upstream of former swampy meadows and was deposited down the center of the valley. Incision likely followed catchment deforestation and the introduction of livestock, which overgrazed and congregated in valley bottoms in the early 20th century during a period of drought. As a result, severe gully erosion was likely initiated in localized, compacted, and oversteepened reaches of the valley bottom.
AU  - Portenga,EW
AU  - Bishop,P
AU  - Rood,DH
AU  - Bierman,PR
DO  - 10.1002/2016JF004052
EP  - 527
PY  - 2017///
SN  - 2169-9003
SP  - 513
TI  - Combining bulk sediment OSL and meteoric Be-10 fingerprinting techniques to identify gully initiation sites and erosion depths
T2  - Journal of Geophysical Research. Earth Surface
UR  - http://dx.doi.org/10.1002/2016JF004052
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000396168000004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/48674
VL  - 122
ER  -
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