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The Jiaomen outlet is the main flood and sediment discharge of the Zhujiang River. It is connected with Humen outlet through a lateral branch, namely the Fuzhou Channel. The flow and sediment division ratio of the bifurcated Jiaomen outlet are important for flood control and navigation safety of the Guangdong-Hong Kong-Macao Greater Bay Area. Focusing on the flow division ratio of the Fuzhou Channel, this study designed a series of scaled physical experiments to explore the relationship between flow division ratio of the Fuzhou Channel and the flow of Jiaomen outlet and adjacent Humen outlet. The dimension of the physical model is based on morphological characteristics in the vicinity of the Jiaomen outlet nowadays. Results of the experiment are in good agreement with the filed measurements under two different flow conditions, demonstrating a reliable model performance. Subsequently, series of experiments have been carried out by varying upstream discharges of Humen and Jiaomen. Experimental results indicate that the division ratio of the Fuzhou Channel depicts a positive relationship with the flow velocity ratio between Humen and Jiaomen. Thus, the flow division ratio of the Fuzhou Channel depends on both Humen and Jiaomen. The experimental results further suggest that, under present geomorphic situation, if the upstream velocity ratio between Humen and Jiaomen decreases to 0.35, the Fuzhou Channel would shift from the main branch to secondary. The research results can provide a reference for the artificial regulation of Jiaomen outlet and its flood and navigation safety.
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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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