期刊文献+

长江口泥沙输移扩散与沉降过程高分辨率声学现场观测

Field High-Resolution Acoustic Observation of Suspended Sediment Dispersal and Deposition in the Yangtze Estuary
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摘要 河口悬沙属性的现场观测对于泥沙输移和沉积过程研究具有重要的意义,现场超声探测较其他观测技术和方法具有较大的优势.本文应用ASSM-Ⅱ型声学悬浮泥沙观测系统对长江口悬沙输移扩散进行高分辨率观测,洪季涨潮期现场观测发现:①在潮流和颗粒重力共同作用下,抛泥泥沙同时存在输移扩散和沉降过程;②抛泥泥沙输移扩散存在2种基本的模式,即表层低密度羽状流和底层高密度羽状流.在正常天气涨潮流作用下,泥沙沉降可形成二级泥跃层,平流输送和沿程密度差产生的压力梯度形成底层高密度羽状流,它是泥沙输移扩散的主要方式.
出处 《地球学报》 EI CAS CSCD 北大核心 2003年第z1期252-257,共6页 Acta Geoscientica Sinica
基金 本文由上海市自然科学基金项目(批准号:02G14108)和上海市博士后科研资助项目(沪科2001第535号)联合资助.
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