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闽江口川石水道,口内段落潮流占优势,口外段涨潮流占优势,口门附近是落潮流优势向涨潮流优势转化的过渡地带.由于水流分汊、分歧、扩散、会潮以及盐淡水混合等因素的作用,口门附近水动力条件较弱.该水道在中潮位以下的低水时期泥沙运动活跃,河槽冲淤变化剧烈. 在川石水道的口门上发育着拦门沙,堆积体部分处在口内,部分处在口外,两部分堆积体虽然相连,在外形上是一整体,并统称为内沙浅滩,但是口内外堆积体的形成发育过程有明显的差别.川石水道口门上的拦门沙实原上是由不同原因造成的两个浅滩的联合体.
Minjiang estuary river stone channel, the mouth section of the tide prevails, outside the mouth section tide trend dominates, near the gate is the trend of falling tide advantage tide advantage of the transformation of the transition zone.Because of water flow, disagreement, proliferation, tide and freshwater salt mixture And other factors, the hydrodynamic conditions near the mouth are weak.The movement of sediment in the water channel below the mid-tidal level is active and the scouring and silting in the river channel changes drastically.At the mouth of the river stone channel, Part of the mouth, part of the mouth outside, although the two parts of the pile body is connected, in appearance is a whole, and collectively referred to as the Shasha, but the mouth inside and outside the accumulation of body formation and development of significant differences. The barrage of sand was originally a combination of two fordrs caused by different causes.