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In order to comprehensively assess the risk of urban UAVs falling onto ground transportation, a systematic risk assessment method combining theoretical derivation and simulation experiments was proposed. Firstly, the urban air-ground traffic network structure was constructed. Considering the dynamics of UAVs and ground vehicles, as well as the traffic flow characteristics of the air-ground traffic network, theoretical derivation was used to determine the possible ground traffic risk interval. Secondly, Monte Carlo simulation was carried out to obtain the ground traffic risk value based on the statistical results of the test. Then, the theoretical analysis and simulation test analysis were combined to comprehensively evaluate the risk of UAVs falling to ground traffic. Finally, a simulation case study was carried out in Tianjin. The results show that the risk of UAVs falling on ground traffic is affected by several factors such as crash probability, ground traffic density, and the structure of the air road network. The statistical risk value of the simulation test is consistent with the theoretical analysis of the risk interval, which preliminarily verifies the reasonableness of the proposed method.
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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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