海洋地质与第四纪地质2018，Vol.38Issue(1)：41-51,11.DOI:10.16562/j.cnki.0256-1492.2018.01.005
椒江河口春季悬沙输运特征及通量机制研究
Suspended transportation and flux mechanism of sediment in the Jiaojiang Estuary in spring
摘要
Abstract
A detailed study on hydrodynamic characteristics and transportation mechanisms of suspended sediment at two specific sites of the Jiaojiang Estuary were conducted in March,2017.The data resulted from the observation at anchor stations show that the Jiaojiang Estuary is characterized by a bidirectional field of currents,and the tidal currents at the stations within the river mouth are obviously stronger than that at the sites located outside the river mouth.The depth-mean SSCs at the two stations are 0.3～5.8 kg/m3,and 0.3～1.0 kg/m3,respectively.The results of mechanism decomposition of sediment transport indicate that at the upstream site,the dominant mechanism of transporting suspended sediment is the seaward tidal pumping,which contributes 49.3％ of the total absolute sediment flux,followed by the landward advection and the vertical net circulation.As the result,the net suspended sediment transport is 0.39 kg/(m · s) landward.However,the sediments fluxes at the downstream station are dominated by the seaward advection,with 72.6％ of contribution,and the net suspended sediment transport is 0.10 kg/(m · s) seaward.The three-layers wavelet analysis and spectral analysis suggest that there are somewhat coupling response relations between the SSC and the sediment transport rate and flow velocity.The sediment transport rate is dominated by the flow velocity at the outer site of the estuary,and SSCs at the site inside.关键词
椒江河口/机制分解/潮泵作用/平流输沙/小波分析Key words
Jiaojiang Estuary/mechanism decomposition method/tidal pumping/advection/wavelet analysis分类
资源环境引用本文复制引用
刘伟,范代读,涂俊彪,芦军..椒江河口春季悬沙输运特征及通量机制研究[J].海洋地质与第四纪地质,2018,38(1):41-51,11.基金项目
国家自然科学基金项目“人类活动影响下长江口北支动力地貌演化与沉积地层格架研究”(41776052) （41776052）
科学科技基础性工作专项“典型中小入海河流河口动力沉积地貌与环境本底数据调查”(2013FY112200) （2013FY112200）
中国东盟海上合作基金“长江三角洲与红河三角洲全新世沉积演化对比研究” （）
