拟合坐标系下平面二维水流泥沙数学模型及其应用

Establishment and applicaiton of a 2\|D mathematical model\=of flow and sediment with body\|fitted coordinate

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 caluculate the movement of flow and sediment in curved,narrow and long channels the body\|fitted coordinate is introduced.By regional transformation,arbitrary physical domains may be transformed into regular computational fields.A new model of suspended transport is also developed,it can describe the exchange mechanism between suspended load and bed materials.The comprehensive model is verified by observed data at Jiulongtan in the Yangtze River.