辽河口岸线变化对潮不对称影响的研究

受河口地形等因素的影响,潮汐潮流会出现涨落潮不对称现象,这种不对称对河口物质输运过程具有重要的影响.本研究采用流通量偏度和水位不对称度的统计方法研究辽河口岸线变化对潮波变形的影响.结果表明,辽河口潮汐潮流不对称性表现为涨潮主导型,岸线变化导致涨潮历时延长,落潮历时减小,不对称度缩减了0.007~0.071;岸线变化导致涨潮流速减小,落潮流速增大,流通量偏度缩减了0.000~0.248,岸线变化对潮流不对称的影响程度比对潮汐影响的程度大.

Modeling tidal asymmetry response to shoreline change in Liaohe Estuary

Due to the influence of estuary topography and other factors, the asymmetry of tide and tidal current often occurs. To succinctly quantify the asymmetry phenomenon in the estuary, the statistical flood-ebb asymmetry and volume flux skewness are referred. Such features are significantly known to be important role on the mass transport. It is evident that it becomes flood-dominant in Liaohe Estuary after tides and tidal current asymmetry occurs. More interestingly, it is a localized feature that the flood duration prolonged and the ebb duration reduced after shoreline change. The amplitude of its scale decreased between 0.007 and 0.071. The volume flux skewness reduced varying from 0.000 to 0.248 which demonstrates a decreasing in flood current velocity and an increasing in ebb velocity. In general, the influence of shoreline change on tidal current asymmetry is greater than tidal elevation asymmetry.