Pattern Analysis of the Sand Bar Evolution During the Typical Flood at the Modaomen Estuary of the Pearl River
Modaomen estuary is the most important drainage channel in the Pearl River,and occupies an extremely important position in the river system of the Pearl River Delta.The study on the evolution mode of sediment erosion and deposition in Modaomen Estuary has scientific guiding significance for the analysis of geomorphological evolution trend and the future management and development project planning.Taking the typical flood process in June 2005 as an exam-ple,this paper analyzes the evolution characteristics of sediment erosion and deposition at Modaomen Estuary by establis-hing a two-dimension wave-current coupled sediment mathematical model.The results show that under the typical flood conditions,the upstream inflow sand is abundant,and the transport effect of waves on sediment is relatively weakened,which can promote the development of sandy bodies such as shoals in a short time,and form new geomorphic units,and promote the rapid sedimentation of sand bodies on both sides in the form of sand spits,with the development of secondary branching geomorphic units in the estuary.The study shows that the factors affecting the evolution characteristics of es-tuarine erosion and sedimentation include channel topography,flow field,residual flow and sand field,and the sediment carrying capacity of the current,etc.The upstream sediment inflow,tide,wave and other factors dominate the evolution model of estuarine barrier sediment.
NETL
NSTL
万方数据
