GRAIN SIZE DISTRIBUTION IN THE TIDAL ZONE AND SHALLOW SEA ON THE NORTH SIDE OF THE HUANGHUA HARBOR
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摘要: 在黄骅港北侧潮间带和浅海区,分别获得1个柱状样品(岩心长度132 cm,共分得44个样品)和50个底质样品,通过激光粒度分析仪对沉积物粒度进行了测试,获得了研究区底质和柱状样品的沉积物粒度特征,结果显示:研究区底质样品只有3种类型,即黏土质粉砂、粉砂和砂质粉砂;砂质粉砂分布在港池防沙堤附近的潮下带地区,粉砂主要分布在大辛堡村东水深-2~-5 m的浅海区及站位13,其余区域均为黏土质粉砂;黄骅港防沙堤截断了沿岸流,并改变了其方向,使其携带的沉积物在潮间带和防沙堤附近沉积,形成了黏土质粉砂在潮间带和港池防沙堤附近的沉积;与其相邻的砂质粉砂区是废弃三角洲海岸自然演化的证据;表层沉积物的粒度特征表面,黄骅港防沙堤的影响仅限于潮间带和其附近海区;根据沉积物粒度参数特征,HHG2孔可分为4个演化阶段,从下至上分别为:(1)132~100.5 cm的沉积物粗细小幅波动段;(2)100.5~56 cm的沉积物缓慢粗化段;(3)56~16 cm的事件影响型沉积物粗细快速波动段;(4)16~0 cm的沉积物快速粗化段。结合137Cs示踪定年和黄河在大口河附近入海历史,可知16~0 cm的沉积物快速粗化段,是对1917年以来黄河入海位置逐渐东移引起的河流作用减弱以及海平面上升导致的海洋作用增强的响应。Abstract: 1 core (132 cm long and 44 samples) and 50 bottom sediments samples were collected in the offshore area on the north side of the Huanghua Harbor, and grain size analysis was carried out with Mastersizer2000. Results indicate that there are three types of bottom sediments, namely sandy silt, silt and clayey silt, in the area. Sandy silt is distributed in the subtidal zone on the north side of the harbor, silt mainly in the offshore area -2m~-5m in water depth at Daxinpu and sampling site 13, and clayey silt in the other area. The Harbor has cut off the coastal current, and changed it to the direction along the dam of the Harbor, that caused the currents-carried sediments deposited on the tidal flat and the area near the dam. As an evidence of the abandoned deltaic coast, sandy silt near the Harbor suggests that the impact of the construction of the Harbor is limited to the tidal flat and its nearshore area. According to the vertical grain size distribution pattern of the sediments, the Hole HHG2 can be divided into four segments from bottom to top:(1) the segment with slight fluctuation of coarse-fine grains in 132~100.5 cm, (2) the segment slowly coarsening up in 100.5~56 cm, (3) the segment with rapidly coarse-fine fluctuation caused by episodic events in 56~16 cm, and (4) the segment rapidly coarsening up in 16~0 cm. Furthermore, the forth segment of 16~0 cm is well correlated to the period from 1917 up to present defined by 137Cs tracing and dating. During the period, the fluvial process was weakened due to the shift of the Yellow River eastward, and the enhancement of marine process by sea level rise.
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Key words:
- grain size /
- bottom sediment /
- core /
- Huanghua Harbor
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