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Outline
Aiming at the limitations of the current debris flow source detection algorithm, a YOLOv5s-GCE model was proposed. This model introduces CBAM attention mechanism, Ghost convolution and EIOU bounding box loss function to improve its identification accuracy and efficiency. In order to verify the detection effect of YOLOv5s-GCE model, it was compared with YOLOv4 and YOLOv5s models. The results show that the average accuracy of the YOLOv5s-GCE model is 95.4%, which is 2.5 and 8.6 percentage points higher than that of the YOLOv4 and YOLOv5s models, respectively. The detection accuracy of YOLOv5s-GCE model for debris flow source is as high as 96%, and the detection effect is better. The particle flow numerical simulation method was used to study the migration law of debris flow. The simulation results show that the front end of the source body is destroyed and migrated in the initial stage, and the infiltration of water particles leads to the increase of porosity and structural instability of the source body. The mid-section of the source body is subjected to compression from the rear end and restraint from the front end, leading to a significant reduction in porosity, structural densification and the occurrence of localized bulging. In the later stage of migration, a large number of material sources accumulated at the gully mouth. The threat of debris flow to downstream construction facilities is significant, and the soil on the left side of the mid-section of the source area is the most threatening in extreme weather. The research results are of great significance to the prevention and control of slag-type debris flow.
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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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