Sedimentary structures formed under upper-flow-regime in seasonal river system: A case study of Bantanzi River,Daihai Lake, Inner Mongolia
Tan Cheng-Peng1, Yu Xing-He2, Liu Bei-Bei3, Xu Lei4, Li Shun-Li2, Feng Shuang-Qi1, Tang Yu-Sheng1
1 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500, Sichuan; 2 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 3 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 4 CNOOC Research Institute,Beijing 100028;
Abstract：In contrast to Froude subcritical flows,understanding of the mechanism and genetic bedforms of upper-flow-regime,especially Froude supercritical flows,remains limited. Seasonal rivers have been considered as important proxy for the study of upper-flow-regime,since the highly potential of preservation and generation of bedforms produced under upper-flow-regime in this kind of depositional system. In this study,the definition,criterion and sedimentary characteristics of seasonal rivers have been summarized briefly according to literatures review. Upper-flow-regime sedimentary structures in the Bantanzi River,which is a typical seasonal alluvial system at the north margin of Daihai Lake,were identified and interpreted. Results show that low-angle and sigmoidal cross-stratifications were generated during the transformation period of dune to upper plane bed. At the initial stage of upper-flow-regime,planar laminations were formed by upper plane bed. As flow strength increasing,flow regime changed to supercritical flow and antidune cross-stratifications were produced. With consistent increasing in flow strength,hydraulic jumps arisen in sediment-laden flow,hence chute-and-pool occurred and produced related sedimentary structures. The upper-flow-regime sedimentary structures developed in the Bantanzi River correspond genetically to the climate features in this area,which infers that extensive upper-flow-regime structures produced and preserved in fluvial deposits could indicate strongly seasonal variation of paleoclimate.
Tan Cheng-Peng,Yu Xing-He,Liu Bei-Bei et al. Sedimentary structures formed under upper-flow-regime in seasonal river system: A case study of Bantanzi River,Daihai Lake, Inner Mongolia[J]. JOPC, 2018, 20(6): 929-940.
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