江苏如东西太阳沙及烂沙洋海域潮流泥沙数值模拟

基于不规则三角形网格有限差分法并考虑波浪及其破碎作用,建立了平面二维潮流场和泥沙场数学模型.该模型对有望建设成深水码头和深水航道的江苏如东西太阳沙和烂沙洋海域的潮流场和泥沙场进行了细化数值模拟.数值模拟结果表明：（1）本海区潮流基本上是顺深槽流动的往复流,潮流流速大,烂沙洋北水道和西太阳沙附近大潮涨落潮最大流速分别在2 m/s和1 m/s以上;（2）本海区的潮平均水体含沙量在0.5 kg/m^3以下,落潮含沙量大于涨潮含沙量;（3）小浪对水体含沙量影响很小,大浪作用下水体含沙量明显增加.

Numerical Modeling of Tidal Flow and Suspended Sediment Transport in the Coastal Seas near Xitaiyangsha Shoal and Lanshayang at Rudong, Jiangsu Province

Two-DH mathematical models, incorporating waves and wave breaking, are developed to model tidal flow field and suspended sediment field.Those models are generally based on the irregular triangular grid and the finite difference scheme. They are used to finely model tidal flow and suspended sediment transport in the coastal waters near Xitaiyangsha shoal and Lanshayang at Rudong, Jiangsu Province, where the deepwater port and deepwater navigational channel are expected to be built. Modeled results show that ( 1 ) The tidal flow is basically deep channel-wise and bidirectional with large speeds, which peake 2 m/s and 1 m/s for both the maximum flood and ebb tidal flow velocities in the coastal waters near the northern Lanshayang waterway and Xitaiyangsha, respectively; ( 2 ) The mean suspended sediment concentration is below 0.5 kg/m3, while the mean suspended sediment concentration at ebb tide is larger than that at flood tide; and ( 3 ) weak waves have less effect on the suspended sediment concentration than strong waves.