A riparian vegetation dynamics model was proposed to consider the mutual influence of hydro-morphology and vegetation dynamics in a sand-bed river. The simulation model consists of four sub-models: river flow and sediment transport, recruitment, growth and expansion, and destruction of vegetation. The numerical simulation was applied to the downstream part of a sand-bed river for predicting the vegetation dynamics over a long period. The model performance is validated by comparison with the field investigation results obtained from analysis of aerial photographs. The simulation results showed that the growth of vegetation starts from the shoreline and the downstream part of sandbars, and the riparian vegetation increases the stability and the relative elevation of the bars. From the good agreements of the temporal tendencies of vegetation recruitment, expansion, and destruction with those obtained from the aerial photographs analysis, the vegetation dynamics model proposed in this study was verified to reproduce the long-term trend of riparian vegetation dynamics fairly well. Finally, the model was applied to different sandbar modes, i.e., alternating bars and multiple bars. The simulation results indicated that the expansion and destruction rates of vegetation show similar tendencies for both bar mode cases, and they were mainly determined by the magnitude of the annual maximum flood. However, the amount of vegetation coverage rate in the alternating bar case was higher than that in the multiple bar case.

提出了一种河岸植被动力学模型，考虑了沙床河水文形态与植被动力学的相互影响。该模拟模型由四个子模型组成：河水和泥沙输送，补充，生长和扩展以及植被破坏。数值模拟被应用于沙床河的下游，以长期预测植被的动态。通过与航拍照片分析获得的现场调查结果进行比较，可以验证模型的性能。模拟结果表明，植被的生长从沙洲的海岸线和下游开始，而河岸植被增加了沙洲的稳定性和相对海拔。通过航空摄影分析得出的植被补充，扩张和破坏的时间趋势的良好一致性，验证了本研究中提出的植被动力学模型可以很好地再现河岸植被动力学的长期趋势。最后，将模型应用于不同的沙洲模式，即交替的沙洲和多沙洲。模拟结果表明，在两种杆状模式下，植被的扩张和破坏速率都表现出相似的趋势，并且主要由年最大洪水的数量决定。但是，交替杆情况下的植被覆盖率高于多杆情况。对该研究提出的植被动力学模型进行了验证，可以很好地再现河岸植被动力学的长期趋势。最后，将模型应用于不同的沙洲模式，即交替的沙洲和多沙洲。模拟结果表明，在两种杆状模式下，植被的扩张和破坏速率都表现出相似的趋势，并且主要由年最大洪水的数量决定。但是，交替杆情况下的植被覆盖率高于多杆情况。验证了本研究中提出的植被动力学模型，可以很好地再现河岸植被动力学的长期趋势。最后，将模型应用于不同的沙洲模式，即交替的沙洲和多沙洲。模拟结果表明，在两种杆状模式下，植被的扩张和破坏速率都表现出相似的趋势，并且主要由年最大洪水的数量决定。但是，交替杆情况下的植被覆盖率高于多杆情况。模拟结果表明，在两种杆状模式下，植被的扩张和破坏速率都表现出相似的趋势，并且主要由年最大洪水的数量决定。但是，交替杆情况下的植被覆盖率高于多杆情况。模拟结果表明，在两种杆状模式下，植被的扩张和破坏速率都表现出相似的趋势，并且主要由年最大洪水的数量决定。但是，交替杆情况下的植被覆盖率高于多杆情况。