The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study
文献类型：期刊论文
| 作者 | Liu, Dingzhu3,7; Carling, Paul A.2; Wang, Hao7; Liu, Weiming1; Cui, Yifei8; Wu, Chaohua6; Jin, Wen5; Bazai, Nazir Ahmed4 |
| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2022-10-22 |
| 页码 | 18 |
| ISSN号 | 0197-9337 |
| 关键词 | flood hydraulics Froude-scaled model giant bars Megafloods palaeofloods |
| DOI | 10.1002/esp.5488 |
| 通讯作者 | Carling, Paul A.(p.a.carling@soton.ac.uk) |
| 英文摘要 | Evidence for ungauged large freshwater palaeofloods in valley-confined landscapes frequently includes giant flow-eddy bars, deposited in alcoves along the floodway margins. Elevations of the bar tops commonly are used to define the minimum water level for computational flood simulations. Field study has shown that giant bar stratigraphy and sedimentology can be distinctive; identifying the alluvial signature of large palaeofloods where the morphological evidence may be less clear. However, whether the shape and stratigraphy of eddy bars provide indicators as to the nature of the floodwaves has not been considered widely. Flood hydrographs might be dam-break surge waves, gradually varied, or steady flows, for example. Yet, if bar form and stratigraphy vary systematically with the nature of the flood wave, then bars have additional value in defining the style of unrecorded floodwaves for environmental interpretation and flood modelling purposes. An experimental water flume was used to reproduce three styles of scaled floodwave that might be associated with sudden and more protracted releases of water from upstream reservoirs. Discharge was through a channel consisting of a series of contractions and expansions. Eddy bars were deposited within the flow separation zones that formed at each flow expansion. The basic hydraulic characteristics of the floodwaves were recorded and the form of the bars and the stratigraphy were examined. The results indicate that each style of flood deposited a distinctive barform and related stratigraphy. In this manner, we demonstrate that the examination of the form and stratification of giant bars in the natural environment can provide information on the style of the palaeoflood - sudden release or protracted flow - that was responsible for the deposition of the bars. Such information assists with the identification and interpretation of the nature and source of the floodwater as well as informing attempts to model hydrograph shapes. |
| WOS关键词 | DAM-BREAK ; CHANNELED SCABLAND ; OUTBURST FLOODS ; ALTAI MOUNTAINS ; MEGAFLOOD ; FLOW ; PROPAGATION ; MODEL ; WAVE |
| 资助项目 | National Natural Science Foundation of China[41941017] ; National Natural Science Foundation of China[42120104002] ; Sichuan Science and Technology Programme[2021YFH0009] ; Chinese Academy of Sciences (CAS)[E1R2140140] |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| 出版者 | WILEY |
| WOS记录号 | WOS:000870932900001 |
| 资助机构 | National Natural Science Foundation of China ; Sichuan Science and Technology Programme ; Chinese Academy of Sciences (CAS) |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/186003]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Carling, Paul A. |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Peoples R China 2.Univ Southampton, Geog & Environm Sci, Southampton SO17 1BJ, Hants, England 3.German Res Ctr Geosci GFZ, Sect Earth Surface Proc Modelling 4 7, Potsdam, Germany 4.China Pakistan Joint Res Ctr Earth Sci HEC CAS, Islamabad, Pakistan 5.Minist Emergency Management, Natl Disaster Reduct Ctr China, Beijing, Peoples R China 6.Chengdu Univ Informat & Technol, Coll Software Engn, Chengdu, Peoples R China 7.Chinese Acad Sci, Key Lab Land Surface Pattern & Simulat, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 8.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Dingzhu,Carling, Paul A.,Wang, Hao,et al. The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2022:18. |
| APA | Liu, Dingzhu.,Carling, Paul A..,Wang, Hao.,Liu, Weiming.,Cui, Yifei.,...&Bazai, Nazir Ahmed.(2022).The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study.EARTH SURFACE PROCESSES AND LANDFORMS,18. |
| MLA | Liu, Dingzhu,et al."The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study".EARTH SURFACE PROCESSES AND LANDFORMS (2022):18. |
入库方式： OAI收割
来源：地理科学与资源研究所
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