期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 11, 页码 5725-5731出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL068378
关键词
landslide; drought; earthflow; pixel tracking; aerial photograph; Worldview
资金
- NASA [NNX12AL93G, NNX08AF95G]
- Natural Environment Research Council [NE/L010364/1] Funding Source: researchfish
- NASA [100403, NNX08AF95G] Funding Source: Federal RePORTER
- NERC [NE/L010364/1] Funding Source: UKRI
California's ongoing, unprecedented drought is having profound impacts on the state's resources. Here we assess its impact on 98 deep-seated, slow-moving landslides in Northern California. We used aerial photograph analysis, satellite interferometry, and satellite pixel tracking to measure earthflow velocities spanning 1944-2015 and compared these trends with the Palmer Drought Severity Index, a proxy for soil moisture and pore pressure that governs landslide motion. We find that earthflow velocities reached a historical low in the 2012-2015 drought, but that their deceleration began at the turn of the century in response to a longer-term moisture deficit. Our analysis implies depth-dependent sensitivity of earthflows to climate forcing, with thicker earthflows reflecting longer-term climate trends and thinner earthflows exhibiting less systematic velocity variations. These findings have implications for mechanical-hydrologic interactions that link landslide movement with climate change as well as sediment delivery in the region.
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