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On the non-uniform sand river bed, the armor layer at the bottom of the bridge pier local scour pit will affect the maximum local scour depth of the bridge pier. Through a flume model experiment, the sediment gradation, relative coarseness, and non-uniformity of the armor layer at the bottom of the local scour pit on the bridge pier were studied. The results indicate that the median particle size of the sediment in the armor layer at the bottom of the local scour pit on the bridge pier increases with the increase of the local scour depth on the bridge pier, and its relative coarsening degree increases with the increase of the Froude number, while the degree of non-uniformity decreases with the increase of the Froude number. A formula for calculating sediment particle grading in the armor layer at the bottom of the local scour pit on the bridge pier has been proposed. The applicability and reliability of the proposed formula is verifies by the measured data.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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