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Architectural Model of a Dryland Gravel Braided river,based on 3D UAV Oblique Photogrammetric Data:A Case Study of west dalongkou river in Eastern Xinjiang,China

引用

Acta Geologica Sinica(English Edition) 2023年第1期97卷 269-285页

作者： YIN Senlin ZHU Baiyu GUO Haiping XU Zhenhua LI Xiaoshan WU Xiaojun CHEN Yukun JIANG Zhibin Institute of Mud-Logging Technology and Engineering Yangtze UniversityJingzhouHubei 434023China Research Institute of Exploration and Development PetroChina Xinjiang Oilfield CompanyKaramayXinjiang 834000China School of GeoSciences Yangtze UniversityWuhan 430100China

Three-dimensional unmanned aerial vehicle(UAV)oblique photogrammetric data were used to infer mountainous gravel braided river lithofacies,lithofacies associations and architectural *** architecture and lithofacies associations with detailed lithofacies characterizations were comprehensively described to document the architectural model,architectural element scale and gravel particle scale.(1)Nine lithofacies(i.e.,Gmm,Gcm,Gcc,Gci,Gcl,Ss,Sm,Fsm and Fl)were identified and classified as gravel,sand and fine matrix *** are typical depositional features of a mountainous dryland gravel-braided river.(2)Three architectural elements were identified,including channel(CH),gravel bar(GB)and overbank(OB).CH can be further divided into flow channel and abandoned channel,while GB consists of Central Gravel bar(CGB)and Margin Gravel bar(MGB).(3)The gravel bar is the key architectural element of the gravel braided river,with its geological *** dimensions of GBs and their particles are various,but exhibit good relationships with each *** grain size of GB decreases downstream,but the dimensions of GB do *** bank erosion affects the GB dimensions,whereas channel incision and water flow velocity influence the grain size of *** conclusions can be applied to the dryland gravel braided river studies in tectonically active areas.

关键词： three-dimensional UAV oblique photogrammetry gravel braided river architecture modern deposits west dalongkou river

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