在干旱地区，利用荒漠植被等生态措施可以有效减少河岸侵蚀，但现有研究多针对热带植被以及植被对河岸稳定性和侵蚀速率影响结果，不能综合反映在水流动力作用下植被根系与土体相互作用以及荒漠植被对河岸侵蚀影响机理等。因此本项目以塔里木河干流河岸为研究对象，首先选取典型荒漠植被，研究河岸侵蚀过程中植被根系对河岸土体力学性质、剪切特性以及河岸土体起动和冲刷特性等的影响规律；同时结合典型荒漠植被影响下河岸侵蚀过程水槽试验，分析植被根系对河岸侵蚀的网络作用、护挡作用和牵拉作用以及崩塌后土体在坡脚堆积形式和进一步被水流分解、输移模式等，提出不同根系特征和不同土体组成下河岸侵蚀、崩塌模式，揭示荒漠植被对河岸侵蚀的影响机理；然后建立荒漠植被影响下河岸稳定性计算方法，并与河床纵向和横向变形模型进行耦合，构建新的河岸侵蚀数学模型，对河岸侵蚀过程进行数值模拟，为进一步研究干旱区荒漠植被固土护堤作用机理提供支持和理论保证。

The erosion rate of riverbank can be reduced effectively by planting some desert riparian vegetation and other ecological measures in arid region. But the existed researches are limited to tropical vegetation and the influence results of vegetation on riverbank stability and erosion rate, which can not reflect the interaction between vegetation roots and soil, and the influence mechanism of desert riparian vegetation on riverbank erosion under the action of flow dynamic. Firstly, the erosion processes of main stream riverbank of Tarim River will be investigated in this research and several typical desert plants will be selected. Some relationships between the riparian vegetation roots and soil properties are researched in the process of riverbank erosion, including the physical properties, shear properties, incipient condition and scouring characteristics of soil. Secondly, combined with flume experiment of bank erosion process under the influence of typical desert vegetations, three influence actions of vegetation roots on bank erosion are analyzed, which are the network, retaining and pulling. The deposition pattern of the failed soil, the modes of disintegration and transport for the deposited soil mass under the fluvial erosion are also analyzed. The erosion and collapsed mode are proposed under different roots characteristics and different soil composition, and the influence mechanism of desert riparian vegetation on bank erosion can be discovered. Finally, a calculating method of riverbank stability will be proposed, and it is coupled with the longitudinal and lateral deformation model of riverbed. Thus a new integrated morphodynamic model is developed to predict the evolution of riverbank erosion considering the influence of desert riparian vegetation, which can provide the technical support and scientific basis for the future research on the erosion mechanism of desert vegetation in arid Region.