Journal
GEOMORPHOLOGY
Volume 318, Issue -, Pages 203-216Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.geomorph.2018.06.016
Keywords
Alluvial fan; Aggradation and incision; Tibetan Plateau; OSL dating
Funding
- National Key Research and Development Program of China [2017YFC1501005]
- National Natural Science Foundation of China [41661144046]
- Key Technology Research and Development Program of the Ministry of Gansu Province, China [1604FKCA098]
- National Key Technology R&D Program, China [309 2011BAK121306]
- Chinese Scholarship Council
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This paper reconstructs the Quaternary aggradation and incision history of a debris flow/debris-charged flood-affected valley in order to detect the impact of climate on alluvial fan dynamics. We used optically stimulated luminescence (OSL) dating of quartz to determine the ages of alluvial fan terraces. Comparison between the aggradation and incision history and regional climatic records suggests that aggradation occurred in cold and/or dry climates, whereas incision is a feature of warm and wet climates. Cold climates lead to enhanced frost shattering, and dry climates cause deteriorated vegetation. Both effects caused surplus sediment which was transported by infrequent flood discharges to form alluvial fan/terrace deposits. Incision during wet and warm climates is due to increased vegetation cover and an increase in the frequency of flood discharges. This relationship between climate and valley evolution is applied to assess future changes in the present active channel by considering recent climatic records. The results show that the valley channel is expected to experience net incision if the average temperature continues increasing while precipitation maintains at a constant level. (C) 2018 Elsevier B.V. All rights reserved.
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