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双跃曲线历来被认为是海滩、双向流的沉积环境标志.本文详细分析实验海滩砂、天然浪成Ripple砂及综合国内外海滩、潮流和河流体系双跃曲线资料分析,指出维谢尔关于双跃式给出“冲流——回流分界点”的解释不符实质,修正科尔默双跃试验曲线的关系;提出了凹双跃和凸双跃的形成主要是底床剪切差异和水流剪切差异所决定,并非海滩、双向流环境的特有标志;说明粒度概率图对沉积环境不是直接反映,而对搬运介质水动力条件是直接反映,所以是研究环境水动力条件的手段之一;并根据合成曲线特定形式和概率坐标的关系,提出揭示曲线结构的“组合型”分析方法.
The double jump curve has always been considered as the sign of sedimentary environment of beach and bi-directional flow.In this paper, the double-jump curves of experimental beach sand, natural ripple sand and integrated domestic and international beaches, tidal currents and river systems are analyzed in detail. The jump gives the explanation of “runoff - backflow demarcation point” inconsistent with the essence, and modifies the relationship of the double jump test curve of Colmer. It is proposed that the formation of concave double jump and convex double jump are mainly the difference of bed shear and water flow shear It is not the characteristic sign of beach and two-way flow environment. It shows that the particle size probability map is not a direct reflection of the sedimentary environment, but directly reflects the hydrodynamic conditions of the transportation medium. Therefore, it is one of the means to study the environmental hydrodynamic conditions. According to the relationship between the specific form of the synthetic curve and the probability coordinate, a “combination” analysis method of revealing the structure of the curve is proposed.