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After the operation of the Three Gorges Project, the process of water and sediment in the lower reaches of the reservoir changed greatly and led to the adjustment of the evolution law of the curved channel, which may have adverse effects on the stability of the river and the safety of flood control. Based on the measured data, the evolution law of the typical bends in the lower reaches of the reservoir and its main causes were analyzed. The results show that after the operation of the Three Gorges Project, the typical bends in the lower reaches of the reservoir all appear "cutting beaches", and the main reason is that the sediments enter each river reaches. The amount of sand, especially fine-grained sand, has been greatly reduced. The main reasons for the "skipping bends" in most of the bends in the Lower Jingjiang are that the variation coefficient of the monthly average runoff process is large and the bending radius of the bends itself is small. With the successive operation of cascade reservoirs in the main and tributaries of the upper reaches of the Yangtze River, it is expected that the variation coefficient of the monthly average runoff process in the lower reaches of the reservoir will continue to increase, which may lead to the occurrence of bends with relatively small bending radius that do not currently have "skipping bends".
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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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