Dabin Liu

08 Nov Dabin Liu

Dabin Liu, working in the Department of Sediment Research, China Institute of Water Resources and Hydropower Research (IWHR), has taken mainly researches for years on sediment transporting, river bed evolution, offshore circulation, estuarine and coastal dynamic processes.

Numerical Simulation Of Typhoon Influence On Marine Dynamic Elements In The Pearl River Estuary

Taking the Pearl River Estuary and its adjacent sea area as the research focus, a triple two-way nested model system is established based on POM and nesting technology. The calibration and verification of the model show that the model system has the ability and better accuracy to simulate the tidal, storm surge, flow field, temperature field and salinity field in the Pearl River Estuary.

The tidal level, current velocity, temperature and salinity of the Pearl River Estuary during the transit of typhoons 9505 and 9509 have been simulated. The impact of Typhoon on the dynamic elements of the Pearl River Estuary mainly includes:

1. The height difference between the adjacent high and low tides becomes larger, and the irregular semidiurnal tide phenomenon is no longer maintained. The influence of the variation of the tide level at different positions is different from that of other factors.
2. Storms induce significant changes in the sea level flow regime, from regular coastal currents or reciprocating flows to random, twisted and swinging turbulent flows, and an anticlockwise cyclonic flow field occurs on the sea surface along the central path of a typhoon.
3. When a strong typhoon passes through the sea, it causes the upwelling, turning the low-temperature deep water upward, which leads to the abnormal change of the surface temperature in a short time. After that, the decreasing of temperature continues for a period of time.
4. Because the outer sea is open and the salinity is stable, the influence of Typhoon on the sea surface salinity is very small, but typhoon landfall will induce a large number of high salinity seawater to transport to the shore, so that the sea surface salinity in coastal and estuary area will increase.