利用准三维的ｆＫｄＶ方程和四区间划分法，理论给出了任意截面的直渠道中先锋孤立子生成的理论平均波阻和区间平均能量的时间变化率。基于ｆＫｄＶ方程系数的正则性，文中结果是Ｘｕ等人结果的一个推广。对具有相同截面面积的正方形和等腰三角形截面的渠道及在不同强迫源和强迫源速度条件下，对理论平均波阻和平均生成能的时间变化率进行了数值比较和理论预报。比较指出，理论和数值结果吻合得很好。 Using quasi-three-dimensional fKdV equation and four-zone partitioning method, the theoretical average wave resistance and the average time-varying rate of the average energy of the avant- Based on the regularity of the coefficient of fKdV equation, the result in this paper is a generalization of the result of Xu et al. For the channels with square and isosceles triangular cross section with the same cross - sectional area and under different conditions of forced source and forced source velocity, the numerical comparison and theoretical prediction are made on the time varying rate of the theoretical average resistance and the average generated energy. It is pointed out that the theoretical and numerical results are in good agreement.