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In order to investigate the impact of typical ecological revetment fish-nest brick on the hydrodynamic characteristics of straight water conveyance channels, a 3-D numerical model (LES) incorporating fish-nest brick was developed using large-eddy simulation technology. Periodic boundaries were employed in the longitudinal direction to allow for the repeated development of water flow within the computational domain. The reliability of the numerical model was extensively validated through experimental data from flume tests. Subsequently, the LES model was used to simulate the hydrodynamic characteristics of channels containing fish-nest brick. The results indicate that the fish-nest brick divide the channel into a high-speed main flow region and a low-speed fish-nest cavity. The time-averaged flow velocity in the main flow region is approximately 1.8 times the cross-sectional average flow velocity (U0), and a continuous distribution of vortices exists throughout the entire water depth range. Conversely, the time-averaged flow velocity and turbulence within the fish-nest cavity are at relatively low levels, making it suitable for fish habitat and the hatching of adhesive eggs. The mixing layer at the mouth of the fish-nest cavity exhibits relatively strong vortex structures, which significantly enhances turbulence intensity and services as the primary driving force for momentum exchange between the interior and exterior of the fish-nest cavity.
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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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