瓯江河口推移质的造床作用  

A Bed-forming Role of Bedload in the Oujians Estuary

作　　者：孙志林[1] 

机构地区：[1]杭州大学地理学系

出　　处：《杭州大学学报（自然科学版）》1992年第4期455-460,共6页Journal of Hangzhou University Natural Science Edition

基　　金：国家自然科学基金赞助项目

摘　　要：潮汐河口推移质运动复杂,人们至今对此所知甚少,本文试图基于实测水流与沉积资料,系统地探讨瓯江河口推移质的造床作用.通过该河口沉积物中推移组分计算,结合悬移质粒度分析认为,推移质是瓯江河口主槽的主要造床物质,水下沙洲及拦门沙等堆积地貌亦系推移质造床的产物.文章进一步根据作者新近提出的方法,获得全年逐时推移质输沙率及逐潮输沙量,藉以初步揭示不同逕潮流组合下推移质运动的时变特性。Bedload transport in tidal estuaries is so complicated that we know little about it. The bed-forming role of bedload in the Oujiang estuary is systematically studied in this paper based on the flow and sediment data measured. It is suggested that bedload is a main bed-forming material in the channel of the Oujiang estuary, and that some accumulated morphological units such as subaquatic shoals and mouth bar result from bedload deposits, after we calculate the bedload fraction of estuarine sediment and analyze the grain-size of suspended load. According to a new approach to compute the quantity of bedload, which is lately developed by the author, this paper has obtained the hour transport rate of bedload in the whole year and the quantity of bedload in every tidal cycle so that it is possible to discuss the time-dependant behaviors of bedload movement under various combinations of runoff with tides.

关 键 词：推移质 造床作用 瓯江河口 河口 

分 类 号：TV148[水利工程—水力学及河流动力学]