Sedimentary dynamics and material source in Yangma Island sea area in Yantai based on grain size end-member model
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摘要:
基于养马岛海域30个表层沉积物粒度测试数据，计算沉积物粒度参数、分解粒度端元，结合区域水动力、岸线类型等因素对沉积物的沉积动力环境和物质来源解析判别。结果表明，海域沉积物平均粒径Φ值从河流入海口向远离岸线方向逐渐变大，分选性由中等逐渐变差，偏度以极正偏为主，峰度为中等—尖锐。粒度数据中提取出4个单峰端元组分，EM1、EM2、EM3和EM4粒级Φ值范围分别为2.75～8.75、3.00～6.25、2.25～4.25和1.50～3.75，EM1端元代表了水深较深、水动力弱沉积环境，物源是黄海沿岸流携带的黄河入海泥沙细粒物质；EM2端元代表了潮流波浪叠加作用下水动力较弱的沉积环境，物源是黄海沿岸流携带的黄河入海泥沙与海水侵蚀基岩海岸产生碎屑的混合物质；EM3端元为潮流、波浪叠加和航道影响下水动力较强的沉积环境，物源是入海河流携带泥沙混合海水侵蚀砂、泥岸线的碎屑。EM4端元代表了水深浅，海水与河水动力共同作用下强水动力沉积环境，物源为入海河流携带泥沙混合海水侵蚀砂、泥岸线以及人类活动产生的碎屑。
Abstract:Based on the grain size test data of 30 surface sediments in Yangma Island sea area in Bohai Sea, Yantai, the grain size parameters were calculated and end members were specified. The sedimentary dynamic environment and material source of sediments were analyzed by combining regional hydrodynamics and shoreline types. Results show that the average grain size (Φ) of the marine sediment gradually increased from river estuary off coast seaward, from moderately to poorly sorted, the skewness turned extremely positive, and the kurtosis was from mesokurtic to leptokurtic. Four single-peak end-member components were recognized from the grain size data, namely, EM1, EM2, EM3, and EM4 in the size ranges of 2.75～8.75, 3.00～6.25, 2.25～4.25, and 1.50～3.75, respectively. The EM1 represented a sedimentary environment in deep water and weak hydrodynamics, and the source of the material was the fine-grained material from Yellow River carried out by the Yellow Sea littoral currents. The EM2 end-member represented a weak hydrodynamic sedimentary environment under the effect of tidal wave superposition, and the material source was the mixture of Yellow River inlet sediment carried by the Yellow Sea littoral current and the debris produced by seawater erosion of bedrock coast. The EM3 end-member represented the sedimentary environment with strong hydrodynamic force under the influence of tidal current, wave superposition and channel, and the material source was the debris produced by the inlet river-carried sediments and the mix of seawater erosion of sand and mud coast. The EM4 end-member represented a strong hydrodynamic sedimentary environment under the joint action of seawater and river hydrodynamics, and the source of material was the sediment carried by the river into the sea, mixed with the sand and mud coast eroded by seawater, and the debris that generated from human activities.
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表 1 沉积物粒度参数及端元含量
Table 1. grain size parameters and end member content of sediments
样品编号 平均粒径/Φ 分选系数 偏度 峰度 端元含量/% EM1 EM2 EM3 EM4 HB1 4.55 1.35 0.47 1.17 29.00 30.81 40.19 0.00 HB2 4.32 1.69 0.23 1.24 35.54 23.39 29.27 11.81 HB3 4.74 1.51 0.34 0.98 44.44 23.00 29.87 2.69 HB4 4.44 1.59 0.27 1.13 36.37 25.21 28.15 10.28 HS5 5.31 1.41 0.41 0.89 48.80 49.88 1.32 0.00 HS6 4.94 1.16 0.38 1.10 37.21 60.40 2.39 0.00 HB7 4.57 1.33 0.32 1.25 29.47 42.56 23.37 4.60 HB8 4.64 1.29 0.48 1.18 26.32 40.06 33.62 0.00 HB9 4.35 1.18 0.47 1.30 21.42 31.60 46.97 0.00 HB10 4.26 1.37 0.30 1.17 28.59 26.79 33.53 11.09 HS11 4.40 1.20 0.49 1.13 26.08 23.84 50.08 0.00 HS12 4.94 0.97 0.34 1.20 34.96 65.04 0.00 0.00 HB13 4.99 1.44 0.37 0.90 45.23 30.39 24.37 0.00 HB14 4.59 1.26 0.44 1.23 26.27 43.02 30.70 0.00 HB15 4.44 1.04 0.42 1.36 14.35 55.97 29.69 0.00 HB16 4.50 1.33 0.32 1.18 32.21 35.73 28.14 3.92 HS17 4.64 1.05 0.28 1.23 28.06 58.87 13.07 0.00 HS18 4.87 1.27 0.32 1.02 41.31 40.75 17.94 0.00 HB19 4.94 1.44 0.21 0.88 55.56 21.54 21.56 1.33 HB20 4.61 1.23 0.38 1.08 31.08 41.60 26.94 0.37 HB21 4.28 1.20 0.36 1.51 17.11 40.60 37.79 4.51 HS22 3.40 1.51 0.74 1.13 16.68 10.31 0.00 73.01 HS23 4.78 1.33 0.56 1.11 24.20 46.24 29.56 0.00 HB24 4.27 1.01 0.46 1.63 6.76 50.35 42.89 0.00 HB25 3.92 0.84 0.19 1.66 1.98 41.31 53.20 3.51 HB26 2.35 0.34 0.02 0.94 0.00 0.00 0.00 100.00 HB27 2.71 0.93 0.58 1.58 6.10 10.05 3.95 79.89 HB28 3.04 0.56 0.16 0.87 0.00 0.00 50.65 49.35 HB29 5.02 1.83 0.09 0.79 63.37 8.67 14.58 13.39 HB30 3.60 1.67 0.11 0.99 27.91 26.07 14.16 31.86 
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表 2 沉积物端元拟合结果
Table 2. End member fitting results of sediments
端元个数 端元相关系数R2 角度离差 1 0.521 35.7 2 0.839 19.9 3 0.920 13.8 4 0.955 10.3 5 0.976 7.4 6 0.990 4.9 7 0.994 3.7 8 0.995 3.4 9 0.995 2.7 10 0.997 2.6
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