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Outline
As a "last resort" for flood control, the effectiveness of flood control projects in flood detention area is crucial for accurately assessing the overall flood control capacity of the area. Based on a one- and two-dimensional coupled hydrodynamic model and scenario analysis method, the effectiveness of flood control projects was evaluated by simulating the flood evolution process in the Xiaoqing River flood-diversion area. The results show that by simulating floods for different recurrence periods before and after the construction of flood control projects and comparing the different evolution results of floods in watercourse and on the surface, the effectiveness of flood control projects can be analyzed in detail, and the overall flood control capacity of the flood diversion area can be effectively evaluated; Three of the flood control projects currently being implemented in the Xiaoqing River flood diversion area in Beijing can achieve the expected flood control effects. Specifically, Project A can effectively protect the flood control safety of the left bank of the Dashijiang River; Project B can facilitate the rapid passage of released flood from the Danning Reservoir through the railway culvert in the flood diversion area; Project C ensures that the discharge of the Xiaoqing River during flood diversion does not exceed 500 m3/s, meeting the requirements of flood control. The proposed method can quantitatively analyze the effect of flood control projects and is of great significance for guiding the planning and construction of flood control projects in flood detention areas and the safety assessment of these areas.
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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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