Study on the diffusion and migration of radioactive nuclides in the sea area near Tianwan Bay,Lianyungang
A three-dimensional tidal current numerical simulation was conducted in the sea area near Tianwan Bay,Lianyungang using the finite volume coastal ocean model(FVCOM).Additionally,tracer and Lagrange modules were employed to investigate the characteristics of radioactive nuclide diffusion and migration,revealing the following findings:the simulation results exhibited a high level of agreement with observational data;the tidal regime in the study area was characterized as regular semidiurnal tides,with absolute value of average error of tide levels below 0.2 m;the absolute value of average error of velocity was below 0.02 m/s,with maximum error of about 0.22 m/s;absolute value of average error of flow direction was below 7°,with the maximum error below 36°.Influenced by tidal currents and seasonal monsoons,radioactive nuclides initially exhibited a northward migration trend,closely following the coastline at the beginning.Over time,various movement patterns,including recirculation and southward migration,emerged.The diffusion and migration of radioactive nuclides from their initial placement locations to the Yellow Sea and the northern East China Sea took a relatively long time,significantly impacting local coastal areas while having a lesser effect on the broader regions of the Yellow Sea and the northern East China Sea.
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