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为了适应河道弯曲、狭长的特点，本文引进贴体坐标系进行区域转换，将复杂的河道计算域转变成规则矩形域，使水流泥沙运动方程在规则矩形域上求解运算．本文还建立了一种新的悬沙输移模式，该模式能较好地体现悬沙和床沙的交换机理．利用长江重庆河段九龙滩水沙资料对模型进行了系统的检验，检验表明本模型能够模拟复杂河床条件下水位和流速场，也能够模拟回流区泥沙冲淤规律．
In order to adapt to the characteristics of river bend and long and thin, this paper introduces the body coordinate system for region transformation, transforms the complex river calculation domain into a regular rectangular domain, and solves the equations of water and sediment movement in a regular rectangular domain. In this paper, a new suspended sediment transport model is also established, which can better reflect the exchange mechanism of suspended sediment and bed sediment. The model was systematically tested by using the data of water and sediment of Jiulongtan in the Chongqing reach of the Yangtze River. The tests show that this model can simulate the water level and velocity field under complex riverbed conditions, and can also simulate the sedimentation and erosion laws in the recirculation zone.