Prediction of concentrated flow width in ephemeral gully channels
Prediction of concentrated flow width in ephemeral gully channels
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DOI：
10.1002/hyp.392
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发表时间：
2002-07
影响因子：
3.2
通讯作者：
J. Nachtergaele;J. Poesen;A. Sidorchuk;D. Torri
中科院分区：
文献类型：
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作者：
J. Nachtergaele;J. Poesen;A. Sidorchuk;D. Torri
经验预测方程的形式W = aQb已报道的小溪和河流，但没有短暂的冲沟。在这项研究中，六个实验数据集被用来建立通道宽度（W，m）和流量（Q，m3 s-1）之间的关系，短暂的冲沟形成的农田。所得回归方程（W = 2·51 Q 0·412; R2 = 0·72; n = 67）合理地预测了观察到的通道宽度。由于与相应实验设置相关的逻辑限制，仅涵盖相对较小的径流排放（即Q < 0·02 m3 s −1）。利用实测数据，将实测的短暂沟道宽度归因于计算的封田径流峰值流量，将回归方程的应用范围扩展到更大的流量（即5 × 10− 4 m3 s −1 < Q < 0·1 m3 s −1）。
Empirical prediction equations of the form W = aQb have been reported for rills and rivers, but not for ephemeral gullies. In this study six experimental data sets are used to establish a relationship between channel width (W, m) and flow discharge (Q, m3 s−1) for ephemeral gullies formed on cropland. The resulting regression equation (W = 2·51 Q0·412; R2 = 0·72; n = 67) predicts observed channel width reasonably well. Owing to logistic limitations related to the respective experimental set ups, only relatively small runoff discharges (i.e. Q < 0·02 m3s−1) were covered. Using field data, where measured ephemeral gully channel width was attributed to a calculated peak runoff discharge on sealed cropland, the application field of the regression equation was extended towards larger discharges (i.e. 5 × 10−4m3s−1 < Q < 0·1 m3s−1).