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The structure of circulation flow is related to physical processes such as material transport, sediment deposition and landform evolution. According to the continuous stratified tidal current data derived by the prototype observation platform of Modaomen Estuary in flood and dry seasons in 2019, the flow characteristic during the spring and neap tide at wet and dry seasons in the east and west branches were analyzed. Theoretical methods were used to explore plane circulation and gravity circulation structure in the east and west branches. Besides, the longitudinal circulation with the tidal strain circulation was explained by the mixed parameter. Plane circulation flow structure with ebb at west branch and rise at east branch during the dry season was found. Moreover, gravitational circulation at dry season was generally larger than that at wet season, and the gravitational circulation at west branch was stronger than the east branch, with 0.2–0.25 m/s surface velocity and much lower bottom velocity. The tidal strain circulation driven by the tidal asymmetry at wet season spring tide was relatively higher, which tends to favor the magnitude of vertical circulation. Additionally, the muti-layer residual current also displays seasonal and tidal variations. The residual current at wet season was relatively larger than the dry season, with the surface residual flow velocity more than 0.6 m/s during the neap tide at west branch. However, the downstream residual current at surface and upstream residual current at bottom was found at east branch. Much lower residual current velocity was found at dry season, indicating that the impact on the substance transport and morphological evolution was lower.
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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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