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The unsteady inflow process changes the hydrodynamic characteristics of the compound open channel and then determines the processes of material transfer and energy transfer in the floodplain and main channel. In order to study the influence of different unsteady inflow processes on the hydrodynamic characteristics of the compound open channel, indoor flume experiments were carried out to analyze the influence of different unsteady inflow processes on the water level, flow instability, and discharge per unit width process of the compound open channel, taking into account three factors: discharge amplitude, unsteady period, and rising duration. The results show that with the increase of discharge amplitude, the slope of wave peak growth of water level is greater than that of wave valley, and the wave height increases linearly. The discharge process of the unit width of the channel is deformed over time, and there is an obvious slow change process in the descending process of the main channel and the rising process of the floodplain. With the increase of the unsteady period, the wave peak of the water level increases, the wave valley decreases, and the wave height also increases linearly. The phenomenon of deformation of the unit width discharge of the channel over time disappears. The water level peaks and valleys change synchronously with the hydrologic skewness. When the hydrologic skewness (ratio of fluctuation water duration) is greater than 1, the rising process of the unit width discharge of the floodplain and main channel will also have an obvious slow change stage.
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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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