2012年调水调沙期间黄河口水沙扩散途径及范围  

Diffusion path and range of water flow and sediment in Yellow River Estuary during water-sediment regulation in 2012

作　　者：胡小雷 陈沈良[1] 刘小喜[1] 谷国传[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《泥沙研究》2014年第3期49-56,共8页Journal of Sediment Research

基　　金：全球变化研究重大科学研究计划课题(2010CB951202);河口海岸学国家重点实验室自主课题经费(SKLEC-2012KYYW06);河口海岸学国家重点实验室开放课题基金(SKLEC-KF201204);山东省自然科学基金青年基金项目(ZR2013DQ025)

摘　　要：以2012年7月调水调沙期间黄河口海域4个连续测站的水文资料为依据,分析研究区海洋动力状况、冲淡水范围及泥沙扩散机理。结果表明:调水调沙期间径流的注入增强了落潮动力;径流在河口向外扩散过程中逐渐被海水掺混成冲淡水,冲淡水大面积扩散,北至38°10'N,东至119°30'E,南至37°45'N。入海泥沙以悬浮扩散方式为主,在近岸区受潮流切变锋阻隔,发生快速沉积。其中受内落外涨锋面阻隔,快速沉积更显著;受内涨外落锋面阻隔,形成通往莱州湾南部海域的泥沙传输通道。从MODIS遥感影像反演的悬沙浓度分布显示,调水调沙期间表层含沙量>0.4g/L的水体主要分布在现行河口南部的沿岸带,与冲淡水主要向西北方向扩散不同,而含沙量为0.2-0.4g/L的水体向北扩散范围与冲淡水主体扩散范围较一致。The hydrological data were collected from 4 monitoring stations in the Yellow River Estuary during the period of water-sediment regulation in July 2012.Based on the observations,the hydrodynamic characteristics,the dispersal area of diluted water and the mechanism of suspended sediment diffusion are analyzed.The results show that during the period of water and sediment regulation,with the runoff emptying into the sea,the ebb tide dynamics were enhanced; the runoff was mixed up with the sea water as diluted water when it diffused into the open sea.The diffusion range of diluted water extended dramatically north to 38°10′N,east to 119°30′E and south to 37°45′N.The suspended sediment diffusion played a significant role in the sediment transport.In the nearshore zone,the suspended sediment deposited rapidly because of the cutting off by the tidal shear front.More rapid deposition occurred where the frontal cutting off was with the ebb tide inside and flood tide outside.On the other side,a sediment transport passage leading to the southern area of the Laizhou Bay was formed where the frontal cutting off was with the flood tide inside and ebb tide outside.The distribution diagram of suspended sediment concentration which was inversed from the MODIS remote sensing image indicated that waters with a surface sediment concentration larger than 0.4g/L mainly distributed along the coastal zone and nearshore waters in the southern part of the Yellow Estuary,while the diluted water diffuse dto the northwest.As to waters with a surface sediment concentration of 0.2 to 0.4g/L,the diffusion range to the north was consistent with that of the main part of diluted water.

关 键 词：黄河口 调水调沙 切变锋 悬沙扩散 快速沉积 

分 类 号：TV148[水利工程—水力学及河流动力学]