CHARACTERISTICS AND TRANSPORT TREND OF SURFACE SEDIMENTS IN INNER LINGDINGYANG FIRTH OF THE PEARL RIVER ESTUARY
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摘要: 对珠江口内伶仃洋158个表层沉积物样品的粒度资料进行分析,探讨了表层沉积物的特征,并在此基础上应用GSTA模型分析了内伶仃洋河口湾泥沙运移趋势。结果表明,珠江口内伶仃洋表层沉积物共有6种类型,其中以黏土质粉砂分布最为广泛。内伶仃洋河口湾泥沙运移特征较复杂,以东槽和西槽为界,分Ⅰ区、Ⅱ区、Ⅲ区。Ⅰ区在涨落潮流的作用下泥沙总体呈现出向东部岸滩运移的趋势;Ⅱ区往复流强劲,盐水楔活动频繁,受科氏力作用泥沙自东北向西南输运;Ⅲ区横门岛至金星门之间的分流间海湾泥沙呈现出向岸滩运移的趋势,淇澳岛周围泥沙呈现出顺时针方向的环流运移的特点。Abstract: The characteristics of surface sediments are studied with the 158 bottom samples taken from the inner Lingdingyang Firth of the Pearl River Estuary. Sediment transport trends are identified by the GSTA model. The results indicate that there are six types of bed deposits in the inner Lingdingyang Firth, with clayey silt being the dominant. The sediment transport pattern in the inner Lingdingyang Firth is complex. Regarding the sediment migration trend, the firth could be divided into three subareas. In the subarea I, or in the east part of the firth, sediments move from the east to the west. In the subarea Ⅱ, sediments move in a pattern from northeast to southwest due to the effect of strong reciprocating flow and deep brine water wedge caused by the Coriolis force. In the subarea Ⅲ from the Hengmen Gate to the Jinxinmen Gate, sediment move from distributaries to the costal beaches. Around the Qiaodao Isle, however, sediments move in a clockwise pattern driven by the local circulation.
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