【摘要】 在天然河湾中,许多横断面的床面横坡并非为一条直线,而是一条折线,存在一个明显的折点,本文首先通过大量的床面横坡具有折点的断面资料统计分析,研究了折点在床面横坡上的位置,然后以折点为界将床面横坡分成两个部分,借助我们已取得的弯道三维水流流速计算公式建立了一个新的横剖面数值预报模型,模型用原型观测资料进行了验证并与前人的横剖面预报模型进行了比较,结果表明新模型比已有的模型能更好地反映弯道床面形态特征,计算值与实测值吻合良好,更多还原

【Abstract】 In this paper, it is presented that the bed transverse slope of many cross-sections in the natural curved alluvial streams doesn’t be a straight line, it is a broken line, and there is an obvious broken point oifthe bed transverse slope. We are the first to study the location of the broken point on the bed transverse slope through the statistic analysis of a vast amount of the cross-sections with the broken point. Then, we divide the -bed transverse slope into two parts to found a new numerical model’ for the prediction of the transverse slopes and bed profiles. The model is proved by the field measured data and compared with other models. The results show that the new model can very well reflect the characteristics of the bed forms. It is evident that the agreement between computation of the new model and measurement is very well satisfactory.S3更多还原