【摘要】 为了解急流弯道水流聚集在凹岸的成因,以便在弯道设计和管理中避免水流露底现象发生,根据急流露底弯道水流速度比较快、在没遇到边壁之前沿直线运动的特点,利用动量方程,推导出急流弯道露底的界限。结果表明急流弯道露底与弯道半径、弯道宽度以及水流的Fr有十分密切的关系,当弯道转弯半径与弯道宽度比小于Fr减去0.5时,就会出现露底现象。结论与前人的试验研究结果大致吻合。更多还原

【Abstract】 The causes of rapid flows concentrating at the concave bank of curved channels were investigated so as to avoid the exposed bottom phenomenon during their design and management.Based on the characteristics of fast velocity and uniform motion of flows in a straight line before knocking against the wall,the limits that the bottom would be exposed were derived by use of the momentum equation.The results indicate that the exposed bottom of curved channels has close relationship with the radius and width of the bend as well as the Froude number.When the ratio of the radius to the width is less than the Froude number minus 0.5,the bottom will be exposed in the bend.They agree with other researchers’ test results.更多还原