科氏力对河口分汊的影响

EFFECTS OF CRIOLIS' FORCE ON ESTUARINE BRANCH FIORD

以长江口、黄河口、珠江口、闽江口等几个分汊河口为例,分析了科氏力在河口分汊中的作用。结果表明,涨落潮流路分歧主要通过形成涨落潮冲刷槽和中央缓流区浅滩而逐渐使河口产生分汊;水面横比降则以横向环流和横向切滩两种形式,或堆积或冲刷,导致河口分汊。

The effects of Criolis' force on the estuarine branch fiord process are measurable,especially in those estuaries located in the middle or high latitudes.The effects of Criolis' force represent two major sides: the different routines of flood flow and ebb flow and the flood erosion channel and ebb erosion channel while a submarine bar is being sformed between these two channels,gradually,the estuarine island,which can make an estuary branch fiord. The latter can produce the transverse circulation and transverse erosion flow,through the contineous accumulation and erosion of these two transverse flows,a branching estuary is formed gradually.Some examples of lateral channels formed by flood tidal current or ebb tidal current in Changjiang River Estuary,Zhujiang Estuary, the Pearl River and Minjiang River Estuary are analysed. The Criolis force plays a very important role in the process of estuauine branchified.