In this study, three recent methods of discharge estimation are evaluated, namely, the interacting divided channel method, the modified divided channel method and the momentum transfer divided channel method, which include momentum exchange on the interface for prediction of discharge. These methods are compared intensively using 22 experimental flume data sets with six river data sets taken from the literature comprising 204 test runs in total. These data sets are categorised as asymmetric compound channels with a wide range of width ratio (B/b), aspect ratio (b/h) and bed slope (

$S_{\mathbf{o}}$

), where

$B$

is the total width of channel at the bankfull condition,

$b$

is the main channel bed width and

$h$

is the bankfull main channel height. All these three methods are capable of predicting both overall and zonal discharge for small- to large-scale channels, including natural rivers. However, the interacting divided channel method is the least erroneous, with an average percentage error of 5.83%. Further investigations should include in-depth discussion on zonal discharge prediction, particularly for floodplain discharge, which has been an area of concern and interest in the areas of the water environment and sustainable design of rivers.

中文翻译：

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用于流量估计的线性尺度模型：不对称复合明渠流量

在这项研究中，评估了三种最近的放电估计方法，即相互作用的分通道方法、改进的分通道方法和动量传递分通道方法，其中包括用于预测放电的界面上的动量交换。这些方法使用 22 个实验水槽数据集与来自文献的 6 个河流数据集进行了深入比较，总共包含 204 个测试运行。这些数据集被归类为具有广泛宽度比 ( B / b )、纵横比 ( b / h ) 和河床坡度 (

${\mathrm{小号}}_{\mathbf{○}}$

）， 在哪里

$乙$

是bankfull条件下通道的总宽度，

$b$

是主渠道床宽和

$H$

是bankfull主通道高度。所有这三种方法都能够预测小型到大型渠道（包括天然河流）的整体和区域流量。然而，交互划分通道法的误差最小，平均百分比误差为 5.83%。进一步的调查应包括深入讨论区域流量预测，特别是洪泛区流量，这一直是水环境和河流可持续设计领域关注和感兴趣的领域。