期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 24, 页码 10663-10670出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL066481
关键词
bank erosion; near-bank flow field; bank roughness; slump blocks
资金
- UK Natural Environment Research Council (NERC) [NE/JO21970/1, NE/JO21571/1, NE/JO21881/1]
- Diamond Jubilee Fellowship from the University of Southampton
- National Great Rivers Research and Education Center (NGRREC)
- Natural Environment Research Council [NE/J021970/1, NE/J021571/1, NE/J021881/1] Funding Source: researchfish
- NERC [NE/J021571/1, NE/J021970/1, NE/J021881/1] Funding Source: UKRI
The three-dimensional flow field near the banks of alluvial channels is the primary factor controlling rates of bank erosion. Although submerged slump blocks and associated large-scale bank roughness elements have both previously been proposed to divert flow away from the bank, direct observations of the interaction between eroded bank material and the 3-D flow field are lacking. Here we use observations from multibeam echo sounding, terrestrial laser scanning, and acoustic Doppler current profiling to quantify, for the first time, the influence of submerged slump blocks on the near-bank flow field. In contrast to previous research emphasizing their influence on flow diversion away from the bank, we show that slump blocks may also deflect flow onto the bank, thereby increasing local shear stresses and rates of erosion. We use our measurements to propose a conceptual model for how submerged slump blocks interact with the flow field to modulate bank erosion.
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