Quantifying detachment rate of eroding rill or ephemeral gully for WEPP with flume experiments
Quantifying detachment rate of eroding rill or ephemeral gully for WEPP with flume experiments
复制标题
通过水槽实验量化 WEPP 侵蚀细沟或短暂沟壑的脱离率
DOI：
10.1016/j.jhydrol.2014.09.040
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发表时间：
2014-11
影响因子：
6.4
通讯作者：
Lei Tingwu
中科院分区：
文献类型：
--
作者：
Zhang Qingwen;Dong Yuequn;Li Fang;Zhang Aiping;Lei Tingwu
Ephemeral gullies or rills are major sediment sources and the primary channel to convey runoff and sediments from hillslopes. Quantifying the detachment rate is important for understanding the erosion process of ephemeral gullies. This study suggests a method to estimate the detachment rate for use in WEPP model, using sediment distribution data along an eroding rill or ephemeral gully under controlled flume experiments, conducted at four slope gradients (8.74%, 17.62%, 26.78%, and 36.38%) and four flow rates (32, 64, 128 and 256 L min−1). The experimental soil materials were packed into the flume of 0.5 m wide, 0.6 m deep and 12 m long, to a thickness of 0.5 m at a bulk density of 1300 kg m−3. Regulated water flow was introduced to soil surface at the upper end of flumes. The detachment rate was calculated from the spatial distribution data of sediment concentrations measured with sediment-laden water samples simultaneously taken along the gullies at one meter intervals. Results showed that the detachment rate was well fitted with downslope distance along the rill or ephemeral gully by an exponential equation. The regression parameters indicated that detachment rate decreases linearly with sediment load in the gully flow. The feedback relationship between sediment load and detachment rate in rill or ephemeral gullies could be adequately represented by the first-order coupling equation for loess soil under steep slopes and high flow rates. The detachment rates along the rills or ephemeral gullies were found to increase with slope gradient and flow rate and the detachment rate was positively related to unit stream power and the deficit between max sediment load and the local sediment load.
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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
影响因子：
3.2
作者：
J. Nachtergaele;J. Poesen;A. Sidorchuk;D. Torri
通讯作者：
J. Nachtergaele;J. Poesen;A. Sidorchuk;D. Torri
影响因子：
6.4
作者：
M. Mahmoodabadi;H. Ghadiri;C. Rose;Bofu Yu;H. Rafahi;H. Rouhipour
通讯作者：
M. Mahmoodabadi;H. Ghadiri;C. Rose;Bofu Yu;H. Rafahi;H. Rouhipour
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：
3.3
作者：
L. Borselli;D. Torri;J. Poesen;P. S. Sanchis
通讯作者：
L. Borselli;D. Torri;J. Poesen;P. S. Sanchis