Purpose

This paper investigates the morphological and location features influencing the sediment texture of small reservoirs located within the embanked floodplain of a lowland river. Bed and suspended loads deposited in these reservoirs, settle as sediments, whose texture could indicate factors shaping processes within the embanked floodplains.

Materials and methods

Sediment samples were extracted from three sections of each of 10 reservoirs and measured with respect to the grain size distribution. The statistical analyses determined factors affecting the texture and enabled the comparison of the reservoirs and their initial, middle, and final sections.

Results and discussion

Factors such as the length of the reservoir, its area, the distance from the river, the width of the embankment area, and the location along the river were found to have a negligible effect on proportion of sediment fractions. The maximum depth and the angle between the reservoir axis and the riverbed were the only two characteristics that notable contributed to the differences in the sediment texture. In deeper reservoirs the content of sand fraction was considerably higher, while simultaneously the share of silt was lower. The angle value influenced the sediment texture of each reservoir in general as well as considering their final parts. As the angle increased, the sand content increased as well, whereas the shares of silt and clay decreased.

Conclusions

The maximum depth and the angle between the river and the reservoir can be considered as the key determinants of the sediment texture in small floodplain reservoirs.

中文翻译：

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形态和位置因素影响小型洪泛区水库的沉积物质地

目的

本文研究了影响低地河堤泛滥平原内小型水库沉积物质地的形态和位置特征。沉积在这些水库中的床和悬浮物以沉淀物的形式沉降，其质地可能表明堤岸漫滩中的因素塑造过程。

材料和方法

从10个储层中的每个储层的三个部分中提取沉积物样品，并进行粒度分布测量。统计分析确定了影响质地的因素，并使得能够比较储层及其初始，中间和最终断面。

结果与讨论

研究发现，诸如水库的长度，面积，距河的距离，路堤的宽度以及沿河的位置等因素对沉积物比例的影响可以忽略不计。最大深度和水库轴线与河床之间的夹角是唯一明显影响沉积物质地差异的两个特征。在较深的储层中，砂粒含量明显较高，而粉砂的含量较低。角度值一般会影响每个水库的沉积物质地，并会影响它们的最终部分。随着角度的增加，含沙量也增加，而淤泥和粘土的份额却减少。

结论

河流与水库之间的最大深度和夹角可以看作是小型洪泛区水库沉积物质地的关键决定因素。