Establishing Stage‐Discharge Relationships in Multiple‐Channelled, Ephemeral Rivers: a Case Study of the Diamantina River, Australia
Establishing Stage‐Discharge Relationships in Multiple‐Channelled, Ephemeral Rivers: a Case Study of the Diamantina River, Australia
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DOI：
10.1111/j.1745-5871.2007.00457.x
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发表时间：
2007-09
影响因子：
3.3
通讯作者：
J. Bullard;G. McTainsh;P. Martin
中科院分区：
文献类型：
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作者：
J. Bullard;G. McTainsh;P. Martin
推导水位流量关系的方法对河流流量曲线的形状有很大的影响。我们比较了一个单一的测量站在澳大利亚的多渠道河流使用三种不同的方法编制的额定曲线-城市径流和流域系统（URBS）的全径流模型，基于几何的速度面积的方法，和预测水文工程中心河流分析系统（HEC-RAS）的计算机模型。与基于几何的速度面积法和HEC-RAS模型相比，在水位高度超过3.5 m时，该模型预测的流量较低。在水位高度小于3 m的情况下，基于流速-面积模型预测的流量与全径流模型相似，但对于较大的洪水事件，流量要高得多。HEC-RAS模型预测在所有阶段高度的流量高于其他额定曲线，这可能是由于低估了表面粗糙度对流速的影响。这三个模型进行了讨论，特别是参考他们的使用多渠道的河流。
The method for deriving a stage-discharge relationship has a significant impact on the shape of the river's rating curve. We compare rating curves for a single gauging station on a mutiple-channelled river in Australia compiled using three different methods – the Urban Runoff and Basin Systems (URBS) rainfall-runoff model, an empirically-based velocity-area method, and the predictive Hydrologic Engineering Centre-River Analysis System (HEC-RAS) computer model. The rainfall-runoff model was found to predict lower discharges for stage heights over 3.5 m than both the empirically-based velocity-area method and the HEC-RAS model. The empirically-based velocity-area model predicts similar discharges to the rainfall-runoff model for stage heights less than 3 m but much higher discharges for larger flood events. The HEC-RAS model predicts higher discharges than both other rating curves at all stage heights probably due to under-estimation of the impact of surface roughness on flow velocity. The three models are discussed with particular reference to their use on multiple-channelled rivers.