大小嶝陆域形成采用耙吸船、 绞吸船联合采砂吹填施工方案.其吹填砂料经检测成分主要为粗砂且粒径较为单一.起动流速是疏浚吹填土质基本水动力学特性之一.通过室内物理模型试验,测试了吹填粗砂不同水深下的起动流速,并与当前常用的张瑞瑾、 窦国仁、 唐存本等起动流速公式进行了比较,推荐适用于该类粗砂的起动流速计算公式,为现场疏浚吹填施工分析计算提供基础数据资料.%The joint sand excavating and filling scheme using trailing suction dredger and cutter suction dredger is employed in Daxiao Deng Islands land formation project. Main component of filled sand material is coarse sand and the particle size is relatively unitary. Threshold velocity is one of the fundamental hydrodynamic characteristics for filled material. The threshold velocity of filled coarse sand was tested under different water depth due to indoor physical model test. The testing results are compared with several common formulas, including Zhang Ruijin formula, Dou Guoren formula and Tang Cunben formula, et al. The calculation formula for the threshold velocity of this kind of coarse sand is recommended after the comparison. The results provide fundamental data for analysis and calculation of the dredging and filling construction project.
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