Welcome to Changming Dong's Research Website
Tidal Front (worked with Drs. H-W. Ou, D. Chen, R. Houghton and M. Visbeck at Lamont, Columbia Univ.)
(adapted from Dong et al, 2004, JGR)
Due to the inhomogenity in the spatial distribution of tidal mixing,
the sea water stratification is homogenized in the shallow water while
it is kept in deeper water, thus a tidal front is formed. Due to
seasonal variation in surface heat flux, tidal fronts have two
types: winter and summer. A summer tidal front has two branches and a winter tidal front has one. The
presence of a tidal front plays an important role in the material and
energy tranport in both cross- and along- coast, and affects the local
mixing as well.
Especially, the cross-frontal circulation is one order smaller than the
along-frontal flow, however the weak transverse circulation has a
significant environmental
implication, such pollution dispersion and nutrient transport.
During my Ph.D study, I studied the cross-frontal circultion applying
analytical model, numerical model and dye-tracer field experiment. The
analytical solution clearly
shows the cross-frontal circulation is composed of three parts: Ekman flow, Bernoulli circulation and Stokes drift.
References:
- C.Dong, D. Chen, H-W Ou, and M. Visbeck, 2005: Tidal-induced cross-frontal circulation: numerical study, submitted to J. Phys. Oceanogr.
- C. Dong, R. Houghton,
H-W Ou, D. Chen and T. Ezer, 2004: Numerical study of diapycnal flow
through a tidal fron with passive tracer, J. Geophs. Res. Vol. 109, C02016, doi:1029/2003/JC002168.
- C. Dong, H-W Ou, D. Chen, and M. Visbeck, 2004: Tidal inbduced cross-frontal circulation: analytical study, J. Phys. Oceanogr. Vol. 34, 293-305.
- H-W Ou, C. Dong and D. Chen, 2003: Tidal diffusivity: a mechanism of frontogenesis, J. Phys. Oceanogr., 33, 840-847.
- D. Chen, H-W Ou, C. Dong, 2003: A model study of internal tide in coastal frontal zone, J. Phys. Oceanogr., 33, 170-187.
- H-W Ou, C. Dong and D. Chen, 2000, On tidal-induced property flux can be locally counter0gradient?, J. Phys. Oceanogra. 30, 1472-1477.
Current Researches:
- Island wakes and their environmental impact.
- High-resolution realistic simulation
- Southern California Bight Circulation and Forecast System
- Bering Sea Ice-Ecological-coupled System
- Sediment Transport
- Pollution (such as DDTs) Dispersion and Water Quality Assessment