Determining ephemeral gully erosion process with the volume replacement method
Determining ephemeral gully erosion process with the volume replacement method
复制标题
用体积置换法确定短暂沟壑侵蚀过程
DOI：
10.1016/j.catena.2015.03.021
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发表时间：
2015-08
期刊：
影响因子：
6.2
通讯作者：
Lei Tingwu
中科院分区：
文献类型：
--
作者：
Dong Yuequn;Li Fang;Zhang Qingwen;Lei Tingwu
研究背景短暂沟壑侵蚀是世界范围内山坡侵蚀的一种重要形式。理解其侵蚀机理具有重要意义。目的提出一种新的体积置换方法来确定短暂沟道侵蚀过程。使用硬颗粒的聚苯乙烯泡沫塑料颗粒将被侵蚀的短沟段重新填充至原始高度，然后测量其体积以估计沿短沟的泥沙浓度分布。详细阐述了测量和计算方法。方法以粉砂壤土（黄土）为材料，进行一系列水槽实验，研究四种坡度和三种流量下的短暂沟道侵蚀过程。临时沟壑是在每次实验运行之前预先形成的。测量了被侵蚀的短暂沟壑部分的体积，并以 1 m 的间隔计算了沿沟壑的泥沙浓度分布。为了进行比较，还采用手动采样杯法对含泥沙水流进行了采样，测量了侵蚀沟沿线的泥沙浓度分布。结果结果表明，体积置换法估算的泥沙浓度与采样法测得的泥沙浓度分布非常相似。在给定流量下，估计和测量的沉积物浓度随着短暂沟壑长度的增加而增加。随着含沙量逐渐接近极限值，增幅逐渐减小。结论在不同流量和坡度下，体积置换法估算的不同距离处含沙量与采样法测得的值基本一致。该新方法为确定短暂沟道侵蚀提供了一种有用且有效的方法，有助于了解短暂沟道侵蚀过程。
BackgroundEphemeral gully erosion is an important form of hillslope erosion all over the world. It is of high significance to understand its erosion mechanism.ObjectiveA new volume replacement method is proposed to determine ephemeral gully erosion process. Styrofoam particles of hard granules were used to refill the eroded ephemeral gully sections lined with gauze sheet to the original elevation, before their volumes were measured for estimating sediment concentration distribution along the ephemeral gully. The measurement and the computational methodologies are illustrated in details.MethodA series of flume experiments were conducted with a silt loam (loess) soil to study ephemeral gully erosion process under four slope gradients and three flow rates. The ephemeral gully was pre-formed before each experimental run. The volumes of the eroded ephemeral gully sections were measured and the distribution of sediment concentration along the gully was computed at 1 m intervals. For comparison purpose, the sediment concentration distribution along the eroded gully was also measured by manual sampling of the sediment-laden water flow with cups.ResultsThe results showed that both the sediment processes estimated by the volume replacement and measured by the sampling method were very similar. The estimated and measured sediment concentrations increased with ephemeral gully length under a given flow rate. The increase rate decreased gradually as the sediment concentration gradually approached its limit.ConclusionsUnder different flow rates and slope gradients, the sediment concentrations at different distances, as estimated by the volume replacement method were about the same as those measured with the sampling method. The new method provides a useful and efficient way in determining the ephemeral gully erosion, and helps to understand ephemeral gully erosion process.
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DOI：
--
发表时间：
2010
期刊：
Transactions of the Chinese Society of Agricultural Engineering
影响因子：
--
作者：
Qin Wei;Zhu Qing-ke;Zhao Leilei;Kuang Gao-ming
通讯作者：
Qin Wei;Zhu Qing-ke;Zhao Leilei;Kuang Gao-ming
DOI：
--
发表时间：
2013
期刊：
Research of Soil and Water Conservation
影响因子：
--
作者：
Luo Long-bi
通讯作者：
Luo Long-bi
影响因子：
3.9
作者：
J. Nachtergaele;J. Poesen;A. Steegen;I. Takken;L. Beuselinck;L. Vandekerckhove;Gerard Govers
通讯作者：
J. Nachtergaele;J. Poesen;A. Steegen;I. Takken;L. Beuselinck;L. Vandekerckhove;Gerard Govers
影响因子：
6.2
作者：
Casali, J.;Loizu, J.;Alvarez-Mozos, J.
通讯作者：
Alvarez-Mozos, J.
影响因子：
6.2
作者：
Poesen, J;Nachtergaele, J;Valentin, C
通讯作者：
Valentin, C