Topic: Observation and simulation of high concentrations of sediment near the bottom of an estuary
Speaker: Researcher Ge Jianzhong
Report time: 10:00, Wednesday, December 22, 2021
Venue: Lecture Hall 109, Ocean Building
Summary of the report:
High sediment concentration near the bottom is one of the common characteristics of estuaries, which is characterized by high sedimentation rate, rapid change and near-bottom movement. It plays a significant role in shaping the estuary topography, and is also the focus of channel dredging and maintenance.
However, it has been one of the difficulties in estuarine dynamics, sediment modeling and engineering applications due to the difficulty of observation and the complexity of generating and transporting mechanisms.
In order to solve this difficulty, Ge Jianzhong led a team to make several observations in the maximum turbidity zone area of the Yangtze River Estuary using a high-resolution near-bottom tripod observation system, successfully capturing the regular generation of high-concentration sediment near the bottom, and determining the role of physical factors such as tidal mixing and water stratification in its generation and extinction.
At the same time, a numerical model scheme of high concentration sediment was successfully developed based on the FVCOM model, and the process of high concentration sediment generation and transport near the bottom of the North channel of the Yangtze estuary under the typhoon was described. The key role of salt tide intrusion in the process was determined.
Through observation and simulation, the different movement patterns of the north channel of the Yangtze River estuary under normal and extreme weather conditions were quantified.
At the same time, Ge Jianzhong will talk about his latest research results on ecological dynamic models.
Brief Introduction of the Speaker:
As a core member of the international advanced ocean model FVCOM development team, Ge Jianzhong has presided over the development of FVCOM core modules such as wave-current interaction, guide dike-groin, fine cohesive sediment, floating mud, river gate, vegetation, algae drift + growth, etc.
He also participated in the development of the FVCOM-ERSEM biogeochemistry module.
A multi-spatial scale, physical-biogeochemical coupled numerical model system for the China Sea and Yangtze River Estuary has been established, and a series of storm surge forecasting software systems have been developed, which are widely used in watershed and ocean forecasting business units.
His research results were published in international famous journals such as JGR, Ocean modelling and Geoscientific Model Development.