Citation: | YI Shantang, WU Chengqiang, LIN Jijiang, HU Xiaosan, LUO Weidong. 2020. Development characteristics and genesis of sand wave groups and their influence on offshore engineering applications in Minjiang estuary-Sansha bay estuary coastal area, Fujian Province[J]. Geology in China, 47(5): 1554-1566. doi: 10.12029/gc20200519 |
Based on high-precision multi-beam, single-beam, side-scan sonar and other data, the authors found two submarine sand wave groups in the offshore areas of Fujian's Minjiang estuary and Sanshawan estuary, respectively. In this paper, the geomorphic characteristics of the development of the submarine sand wave were analyzed in detail. According to the shape of the development of the sand wave and the trend of the sand ridge line, it can be divided into three types: flexural sand wave, linear sand wave and transitional sand wave. Both sand wave groups show a slower slope on the tide and a steeper tide, which is characterized by branching at the end of the sand wave and is accompanied by a certain degree of bending deformation. Sources of sedimentary materials and hydrodynamic environment are two main factors that control the development of sand wave groups on the sea floor. The reduction of sources of near-shore bedrock erosion materials, river sediment materials and ocean current transport materials in the study area breaks the material supply that maintains the dynamic balance of sand waves. Underflow scouring provides the starting conditions for seabed sediments. Combined with the development characteristics of sand ripples, residual dunes and seabed sand waves, the authors hold that sand waves have certain activities and have a law of continuous migration to the steep side of the slope. Finally, through the analysis of the causes and evolution rules of sand wave activity, the authors discussed the influence of the existence of sand wave on the application of marine engineering in detail, and put forward the corresponding preventive measures, which provides a certain reference for the construction of offshore seabed engineering and disaster prevention.
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Location of the study area
Surface sediment investigation station
Three-dimensional topographic map of the sand wave group outside Minjiang estuary
Lateral scanning profile of flexural sand wave group outside Minjiang estuary
Three-dimensional topographic map of the sand wave group outside Sansha bay estuary
Lateral scanning profile of flexural sand wave group outside Sansha bay estuary
Variation of annual runoff and sediment discharge at Zhuqi Station in Minjiang estuary (Data Sources: Dai Shibao, et al., 2007; China River Sediment Bulletin, 2005-2018)
Distribution of major rivers in the East China Sea(in winter)
Distribution of major rivers in the East China Sea(in summer)
Variation of annual runoff and sediment discharge at Datong Hydrological Station in the Yangtze River(modified after WangLihua, 2017)
Submarine sand ridge group shown in shallow seismic reflection section
Residual sand dunes shown in shallow seismic reflection section