A strategy for modelling sediment distribution along slope lengths of an ephemeral gully through the simulated scouring experiments

文献类型： 外文期刊

第一作者： Huang, Yuhan

作者： Huang, Yuhan;Huang, Yuhan;Huang, You;Zhuang, Xiaohui;Wang, Wei;Zhang, Qingwen;Dong, Yuequn

作者机构：

关键词： Ephemeral gully; Soil erosion; Sediment distribution; Sediment transport capacity; Simulation model

期刊名称：CATENA （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0341-8162

年卷期： 2024 年 236 卷

页码：

收录情况： SCI

摘要： Accurately describing the soil erosion process is crucial for improving the accuracy of existing simulation models of ephemeral gully erosion. However, a laboratory experimental strategy for simulating sediment distribution along slope lengths of an ephemeral gully is lacking. This limitation greatly hinders the development of simulation models for ephemeral gully erosion. In this study, we constructed six soil flumes with 12 m in length, 0.1 m in width, and 0.5 m in depth, which were filled with cultivated loess soils. Four flow rates (5.33, 10.67, 21.33, and 42.67 x 10-3 m3 s-1 m-1), four slope gradients (5 degrees, 10 degrees, 15 degrees, and 20 degrees), and six gully lengths (2, 4, 6, 8, 10 and 12 m) were adopted to perform a series of laboratory scouring experiments. The measured sediment concentrations at the outlet ranged from 23.39 kg m- 3 to 534.60 kg m- 3. The trend of exponential increase in sediment concentrations along slope lengths of an ephemeral gully was similar to that observed in a rill. According to the fitting equation, the maximum sediment concentrations (Ae) ranged from 358.05 kg m- 3 to 910.88 kg m- 3. The attenuation coefficients (Be) indicated the rate of increase in sediment load with slope length, which ranged from 0.042 m- 1 to 0.185 m-1. By combining the measured sediment loads along the slope length (8 m) with the sediment transport capacity, the sediment distribution along slope lengths of an ephemeral gully could be accurately quantified. Moreover, the results confirmed that a flume with a short slope length (4/6 m) could effectively determine the sediment distribution along slope lengths at gentle slope of 5 degrees and 10 degrees. However, a minimum length of 8 m was advisable at steep slope of 15 degrees and 20 degrees. In summary, our experimental strategy provides an efficient method for determining the sediment distribution along slope lengths of an ephemeral gully.

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