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Sediment Dynamics and Morphodynamics of River-Sea Sediment Dispersal Systems through Space and Time: A Source-to-Sink Perspective
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The influence of seabed microrelief on hydrodynamic evolutions in the south branch of Yangtze River estuary
P-G1-06-S
Hao Wu* , School of Geography and Ocean Science,NANJING UNIVERSITY
Presenter Email: haowu.esx@foxmail.com |
| Submarine geomorphology and sedimentary dynamics of near-bottom boundary layer in the south branch of the Yangtze River estuary, July 13-19, 2018. 3d topographic, current velocity and Suspended Particulate Matter (SPM) concentration were obtained from 3D Sand Ripple Profiling (3D sonar), Acoustic Doppler Velocimetry (ADV), Optical Backscatter Sensor (OBS). The difference methods were utilized to extract the bedform information from observed sonar data. The relationship was established between the bedform evolution and hydrodynamic/suspended sediment concentration. The erosion and siltation of bottom bed in the study area were analyzed quantitatively and qualitatively. The change rule of roughness height is calculated and the change of hydrodynamic evolution is further analyzed. The results of bottom morphology data show that the morphology change of bed is obvious in tidal period. In addition, by analyzing the data of sedimentary dynamics, it is found that there is a positive correlation between the undulation degree of bed shape and current velocity. The relationship between the fluctuation degree and current velocity of the bed in the east-west direction and north-south direction shows that the current direction has an important influence on the fluctuation degree of the bed. |
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