FIELD TESTING OF THE ERODIBILITY OF TIDAL FLAT SEDIMENT IN THE MODERN YELLOW RIVER DELTA
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摘要: 潮滩沉积物的抗侵蚀性影响着海岸线的稳定,关系到海岸防护工程决策。2008年7月在现代黄河三角洲海港潮滩使用自制的循环水槽进行了表层沉积物抗侵蚀性试验,并测试了沉积物的物理力学性质。经现场实测得出海港潮滩表层沉积物的临界侵蚀切应力值为0.088~0.254 Pa,沉积物抗侵蚀性的非均匀特征,促使了滩面凹坑的形成。影响沉积物临界侵蚀切应力的因素中,剪切强度与临界侵蚀切应力的关系最为密切,二者呈良好的线性关系。临界侵蚀流速试验值与利用各泥沙起动公式计算得到的值差别较大,在目前情况下采用原位测试能得到较为客观的临界侵蚀条件。Abstract: The erodibility of a tidal flat is important to shoreline stability, and concerns the strategic decision for coast protection. In July of 2008, in-situ measurement of erodibility for surficial sediment were conducted using a self-developed recirculating seawater flume on the tidal flat of the modern Yellow River delta. Selected physical-mechanical sediment properties were measured at the same time.Results show that the critical erosion shear stress of the surficial tidal sediments varies between 0.088 Pa and 0.254 Pa. The nonuniform erodibility of surficial tidal sediments causes pitting. The factors influencing critical erosion shear stress of sediment are complicated. Among all the factors,the shear strength is closely related to critical erosion shear stress and there is a good linear relation between the two. The difference between the measured values of critical erosion flow velocity and the calculated values using different formulas is remarkable. In this regard, the more objective critical erosion condition can only be obtained through in-situ measurement.
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