THE INFLUENCE OF CLAY AND ORGANIC MATTER ON THE SEDIMENT AGGREGATION IN THE YELLOW RIVER ESTUARY
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摘要: 微团聚体是形成沉积物结构的基本单元,沉积物的结构性影响了土体的稳定性、渗透性和强度等工程地质性质。对废弃黄河口刁口流路潮间带沉积物微团聚体受黏粒含量、有机质和生物黏液等胶结作用进行分析,结果表明,研究区沉积物多团聚成粉粒级微团聚体(0.05~0.01 mm),含量在85.3%~95.8%之间,与黄土高原土相比,0.05~0.01 mm微团聚体增加,而0.1~0.05 mm微团聚体减少,团聚性差,易于侵蚀;黏粒含量与团聚度表现出显著正相关性,说明黏粒含量增加了沉积物微团聚体的稳定性;沉积物中有机质含量在0.27%~0.61%之间,有机质含量较少,对沉积物微团聚体贡献少;生物扰动的螃蟹洞壁土、螃蟹掘出物的团聚度明显大于表层未受生物扰动土的团聚度,说明螃蟹分泌的黏液能加大微团聚体的稳定性。Abstract: Aggregation is a basic unit to form sediment structure. The structure of sediments impacts on the stability, infiltration and strength of engineering geologic properties. A study was implemented in the abandoned riverway of Yellow River Estuary, Diaokou, on the influence of clay, organic matter and biologic EPS (extracellular polymeric substances) on the aggregation. The results indicate that the sediments mainly become 0.05~0.01 mm aggregation. The content of the aggregation is between 85.3% and 95.8%. Compared with loess in loess plateau, the aggregation of 0.05~0.01 mm increases,and that of 0.1~0.05 mm decreases. The aggregate stability is poor so the sediments are easier to erode. The clay content is in positive correlation with aggregate ratio,which indicates the more the clay content the more stable the aggregation. The mineral composition is not good to aggregate stability. The content of organic matter is between 0.27% and 0.61%. The influence of organic matter on sediment aggregation is little. The aggregation ratio from the sediment of crab cave and crab dug is more than that of the surface sediment without bioturbation. This indicates that the EPS produced by crab can increase the aggregation stability.
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