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Objective Significant advancements have been made in the research of sandy braided river deltas， but the sedimentary characteristics and evolution laws of sandy braided river deltas require further study， particularly the understanding of mouth bars and distributary sand bars. Methods Based on the underground reservoir data， this study used the Delft3D software to show the growth and evolution of a sandy braided river delta into a lake， summarizing its sedimentary characteristics and evolution laws. Results The evolution of a sandy braided river delta has three stages. In the early stage， the delta grows fastest， and the average diameter growth rate was greater than 6 m/step. Sediments are carried into the lake and quickly unloaded， forming a large flower-shaped mouth bar under the water. In the middle stage， the delta plain continues growing， and the delta front remains large， accounting for more than 50% of the delta area. Contiguous sand bodies are built. In the late stage， the delta grows slowly， the average diameter growth rate is maintained at 1m/step. The front area is small， less than 20% of the overall area. The delta plain has many distributary channels and ditches， leading to multiple paths for transforming the distributary sand bars. The delta front sand bars have different degrees of superposition and rhythm combination characteristics， and the distributary sand bars are built on the residual mouth bar. Conclusions A sedimentary model of a sandy braided river delta was established， providing reference for the genetic identification of distributary sand bar and mouth bar， and laying the foudation for advancing underground reservoir architecture research.
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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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