Preservation of planar laminae due to migration of low-relief bed waves over aggrading upper-stage plane beds: Comparison of experimental data with theory
Preservation of planar laminae due to migration of low-relief bed waves over aggrading upper-stage plane beds: Comparison of experimental data with theory
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DOI：
10.1111/j.1365-3091.1997.tb01523.x
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发表时间：
1997-04-01
期刊：
影响因子：
3.5
通讯作者：
Best, J
中科院分区：
文献类型：
--
作者：
Bridge, J;Best, J
低起伏底波在加积的上阶段平面床上迁移形成平面纹层的实验研究表明，某一点的纹层平均厚度随加积速率和通过该点的底波高度的变化而增加。一般来说，保存的纹层只占种群中最大床波高度的一小部分（通常小于50%）。由保拉和Borgman（1991）发展的理论，在没有净淤积的情况下，将地层厚度的概率密度函数与河床波高的概率密度函数联系起来，适用于淤积条件，并与数据吻合良好。这些结果表明，只要能估计出其它参数，该理论就可由平面纹层厚度分布估计出床波高分布、平均淤积率、平均床波波长或平均床波速度。
Experimental studies of the formation of planar laminae by migration of low-relief bed waves over aggrading upper-stage plane beds show that the average thickness of laminae at a point increases with both aggradation rate and the variance of the heights of bed waves passing that point. In general, the preserved laminae represent only a small proportion (generally less than 50%) of the height of the largest bed waves in the population. The theory developed by Paola & Borgman (1991), relating the probability density function of stratal thickness to that of bed wave height for the case of no net aggradation, was adapted for aggrading conditions and shown to agree well with data. These results suggest that the theory can be used to estimate, from the distribution of thickness of planar laminae, either the distribution of bed wave heights, mean aggradation rate, mean bed wave length or mean bed wave celerity, provided the other parameters can be estimated.