作　　者： ; ; ; ; ;

机构地区： 浙江省水利河口研究院

出　　处： 《海洋通报》 2015年第4期399-406,共8页

摘　　要： 基于2013年4月在温州瓯飞浅滩及附近海域采集大中小潮25个观测点的表层沉积物样品以及同步流速观测资料，分析表层沉积物的特征以及对水动力变化的响应。结果表明：（1）瓯飞浅滩及附近海域表层沉积物粒径普遍较细，中值粒径范围0.0059~0.352mm，平均0.0149mm，以粘土质粉砂为主。空间分布上，粒径呈现出“河口河槽粗，口外海域细”；“北部粗，南部细”分布特征；河口区大小潮沉积物粒径变化明显，而口外海域大小潮沉积物粒径没有明显的差异；沉积物粒径越粗，分选系数越差，偏态系数更偏重负值；粒径越细，分选系数越好，偏态接近正偏；（2）由于受到地形和水动力的影响，不同区域的表层沉积物表现出不同的运移方向；GSTA模型结果显示大小潮泥沙输移方向不同，但总体上还是向南-东南方向运移，泥沙主要来源于上游的河流来沙以及海域来沙，而且局部泥沙的交换也是海域泥沙运移平衡的主要途径；（3）该区域河口区潮流输沙作用范围较大，开敞海域主要分布在5m等深线以内；而对于波浪的掀沙作用主要受到波能的大小以及实际水深的影响。在水深5m以内的近海海域沉积物的泥沙运移主要是以波浪和潮流的联合作用为主，而外海的表层沉积物泥沙运移特征主要是以波浪掀沙作用为主。 The paper is based on the analysis data of 75 samples and synchronized hydrodynamic data collected in April 2013, a study on characteristics of temporal and spatial changes in properties of suface sediments and hydrodynamic respons-es in Oufei Shoal and adjacent sea area. The results show that：（1）The grain size of surface sediments in Oufei Shoal and ad-jacent sea area is generally small, and silty clay is the main sediment type in the study area, which mainly contains the silt and clay. The range of median size is from 0.005 9 mm to 0.352 mm. Generally, the results show＆quot;coarse in estuary, fine in out shore sea＆quot;;＆quot;coarse in far shore, fine in near shore＆quot;;＆quot;coarse in north area, and fine in south area＆quot;. There is an obvious change of the grain size in estuary and no obvious change in near shore during spring- neap tidal cycles. （2）The results of GSTA-model show that sediment transport is different during spring-neap tidal cycle, but the whole trend is south- southeast direction. The source of sediments in the study area is mainly from the upstream and sea waters, as well as the inter-regional sediment exchange is another important method to get the balance of sediment supply in this basin. （3） The sediment＆amp;nbsp;transport capability near the estuary is higher than that of other areas. The rage in the open area is between 0.0 m and 5.0 m. And the sediment carrying capability of wave is determined by the wave energy and water depth. Also in the study area, sedi-ments can bear wave motility with wave height not more than 2 m. Furthermore, the sediment transport is mainly caused by wave and tidal current within 5 m isobath in the study area. If the isobath is greater than 5 m in the area, surface sediment transport is caused by wave motility.

关 键 词： 瓯飞浅滩 沉积物 粒度 余流

领　　域： [天文地球] [天文地球]