Depositional characteristics and model for crevasse delta of Xinjiang River in Poyang Lake area, Jiangxi Province
Li Yan1,2, Jin Zhenkui1,2, Li Guizi1,2, Gao Baishui1,2, Shi Liang1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249
Abstract：Based on field investigation,shallow boreholes,exploration trench and google earth,the crevasse delta of Xinjiang River in Poyang Lake area,Jiangxi Province is studied in detail. The crevasse delta is formed when flood breaches the natural levee on west bank of the Xinjiang River and flows into the flood lake nearby. The delta is bird-foot shape in the plane,and is distributed overall perpendicular to the main channel trend of the Xinjiang River. In the transverse profile,the depositional body of the crevasse delta is lenticular in the lateral,and overlies the previous deposits of wetlands or flood lake. The crevasse delta can be divided into three subfacies,i.e. crevasse delta plain,crevasse delta front and crevasse prodelta. On the delta plain,there are crevasse channels,natural levees,abandoned crevasse channels,and wetlands. Crevasse channels can be further divided into waterways,point bars and branch mouth bars. On the delta front,mouth bars and inter-distributary bays are developed. Sheet sand is not developed,because the flood lake is small in scale and wave energy is not high enough to create longshore current to modify mouth bar and crevasse channel sand bodies. The depositional characteristics of the crevasse delta are controlled jointly by fluvial and flood lake process. The evolution model of the crevasse delta can be divided into four stages:Main channel natural levee growth stage,early crevasse stage,prorogation and channel branching stage,channel branching and abandoning stage.
Li Yan,Jin Zhenkui,Li Guizi et al. Depositional characteristics and model for crevasse delta of Xinjiang River in Poyang Lake area, Jiangxi Province[J]. JOPC, 2014, 16(2): 274-284.
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