摘要:
在美国西海岸的一个小河口湾中沉积动力观测系统(SDS)进行现场试验之际,采集了四个箱式柱样,经过X光透射照相和粒度分析、判读分析等工作,获得了该处沉积作用的动态分析成果:1.确定出潮流活动层厚及其影响的因素。2.鉴定出涨潮流层与退潮流层。3.推移质沉积与悬移质沉积。4.确定出底层潮流中存在着优势流,且定为涨潮流。5.确定出该潮流的流速大小。以上解析结果都为现场SDS实测资料所证实是正确的,进一步求得动态的具体数据,最后建立了一个潮汐通道的简单沉积模式。
Abstract:
During the field work for Sediment Dynamic System (SDS) four box-core samples were taken in a tidal channel of Skgit Bay, Puget Sands Washington U. S. A. By using the X-radiography equipment and the conventional analysis in laboratory, some results have been got from sedimentary structures as follows; 1. The tidal active layer (or reactivity layer) is defined, its thickness of 1.5-2.5 cm, and its influential factors are examined critically. 2. According to the features of the sedimentary structures, the layers of flood current and ebb current can be differentiated, the layers of bedload and suspended load discriminated, too. 3. There is a dominant current found along the bottom of the channel, and it is defined as the flood current 4. Based on the granulometric data of the sediment, the speed of the tidal current ups to more than 40 cm/sec. The judgments above are confirmed by spot data measured by SDS. 5. Using the X-radiographied films, the information of the channel sedimentation is got, for example net deposition rate is 0.5-1.0 cm, erosion rate is 1.0-1.5 cm in a tidal cycle. 6. A simple sedimentation model of a tidal channel in estuarine environment is set up finally
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