In the confluent area, flow pattern is tangled, the changes of sediment erosion and deposition are big, and the condition of navigation is complex.
河流交汇口区域水流紊乱，泥沙冲淤变化大，通航条件极其复杂。
The whole process of water and sediment in watershed consist of water generation and concentration, sediment erosion, transportation and deposition.
全流域的水沙过程包括降雨产流、汇流的全过程，以及泥沙侵蚀、输移、沉积的不同运动形态。
Dynamic soil erosion processes involve the spatial and time dependent processes of detachment, rill formation, deposition, re rilling from deposited sediment and scouring of rills.
动态土壤侵蚀包括依赖于空间与时间的土壤剥离、细沟的形成、水流中过量泥沙的沉积、沉积泥沙中细沟的再生等物理过程。
Soil erosion can result in land degradation and sediment deposition of a river, where soil erosion is connected with some natural factors and human activities.
土壤侵蚀是引起土地退化和河流泥沙淤积的根源，其产生与各种自然因素和人类活动存在一定关系。
Through the establishment of two-dimensional mathematical model of flow and sediment, calculate and analyse the effects on river water level, flow field and riverbed erosion and deposition.
通过建立二维水沙数学模型，计算分析对河道水位、流场及河床冲淤的影响。
Through the establishment of two-dimensional mathematical model of flow and sediment, calculate and analyse the effects on river water level, flow field and riverbed erosion and deposition.
通过建立二维水沙数学模型，计算分析对河道水位、流场及河床冲淤的影响。
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