浙江甬江潮波传播特征及影响因素分析

根据浙江甬江2015年全年潮位资料和洪、枯季水文观测资料,分析了潮波自甬江口门向上游传播过程中变形与衰减规律,并分析了影响因素。结果表明:口门处涨潮历时大于落潮历时,随着潮波上溯,上游奉化江河段落潮历时大于涨潮历时,口门处涨潮流占优,上游支流奉化江河段落潮流占优;河床阻力作用、上游径流顶托是造成潮波沿程变化的主要原因,河床阻力越大,潮波衰减越快,大潮期间潮波衰减比小潮期间更为显著,洪季潮波衰减比枯季更快。

Analysis on tidal wave propagation characteristics and its influencing factors of Yongjiang River in Zhejiang Province

According to the annual data of tidal level and hydrological observation results during flood and dry seasons in 2015, the laws of deformation and attenuation of tidal waves during the upward propagation from the Yongjiang River mouth are analyzed, as well as their influencing factors. The results show that the tide rising duration at the Yongjiang River mouth is longer than that of the ebb tide, with the tide wave propagating to the upstream, the ebb tide duration in the Fenghua River, a upstream branch of the Yongjiang River, is longer than tide rising duration, indicating that the rising tide is dominated at the Yongjiang River mouth while the ebb tide is dominated in Fenghua River; bed resistance and the backwater effect from upstream flow are main causes of tidal wave variation, the greater the bed resistance is, the faster the tidal waves attenuates. Thus the attenuation during spring tide and in flood season is more significant than that during neap tide and in dry season.