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Outline
To address the leakage and diffusion issues in light hydrocarbon pipelines，this study establishes a conceptual model of the leakage diffusion process，dividing it into four stages and conducting theoretical analysis with formula derivation.A numerical model of atmosphere‑pipeline‑soil leakage diffusion was developed using CFD to analyze the entire leakage process，focusing on the diffusion range variations of different hydrocarbon components and comparing multi‑component versus single‑component leakage characteristics.Simulation results show that light hydrocarbon leakage occurs in three phases：rapid diffusion in the initial phase，stabilization during the middle phase，and full stabilization after 800 s in the final phase.C3 exhibits the largest gaseous diffusion range，while C5 shows the largest liquid diffusion range.Single‑component C2~C4 demonstrate broader diffusion ranges，whereas multi‑component C5~C8 exhibit larger diffusion extents.In multi‑component leakage，sequential vaporization and diffusion suppress the diffusion of heavy gaseous components，resulting in smaller ranges compared to single components，while liquid components expand their diffusion due to gas‑phase entrainment.This study provides theoretical foundations and technical support for emergency management of light hydrocarbon pipeline leaks.
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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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