Validating and improving interrill erosion equations.
Validating and improving interrill erosion equations.
复制标题
验证和改进钻间侵蚀方程。
DOI：
10.1371/journal.pone.0088275
复制
发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Yang MY
中科院分区：
文献类型：
--
作者：
Zhang FB;Wang ZL;Yang MY
现有的基于小型小区试验的细沟侵蚀方程在很大程度上忽略了坡长和小区大小对细沟侵蚀速率的影响。本文描述了一系列模拟降雨试验，按随机析因设计在5个坡长(0.4、0.8、1.2、1.6和2m)、5个坡度(17%、27%、36%、47%和58%)和5个降雨强度(48、62.4、102、149和170 mm h−1)条件下，在小样地上对现有的细沟侵蚀方程进行系统验证。结果表明，现有的细沟侵蚀方程不能很好地描述细沟侵蚀速率及其影响因素与坡长和降雨强度之间的关系。单因素方差分析表明，径流量、降雨强度、坡度和坡长对细沟侵蚀速率有显著影响，且在p = 为0.0 1时，它们之间的交互作用达到显著水平。通过分析细沟侵蚀含沙量与降雨强度、坡长、坡度的关系，建立了改进的细沟侵蚀方程。在改进的细沟侵蚀方程中，径流量和坡度因子与水蚀预报中的细沟侵蚀方程相同，但将降雨强度的权重调整为0.22指数，并增加了坡长项，指数为−0.25。利用WEPP农田土壤细沟侵蚀性试验数据表明，改进的细沟侵蚀方程较好地描述了细沟侵蚀速率与径流量、降雨强度、坡度和坡长的关系，且优于现有的细沟侵蚀方程。
Existing interrill erosion equations based on mini-plot experiments have largely ignored the effects of slope length and plot size on interrill erosion rate. This paper describes a series of simulated rainfall experiments which were conducted according to a randomized factorial design for five slope lengths (0.4, 0.8, 1.2, 1.6, and 2 m) at a width of 0.4 m, five slope gradients (17%, 27%, 36%, 47%, and 58%), and five rainfall intensities (48, 62.4, 102, 149, and 170 mm h−1) to perform a systematic validation of existing interrill erosion equations based on mini-plots. The results indicated that the existing interrill erosion equations do not adequately describe the relationships between interrill erosion rate and its influencing factors with increasing slope length and rainfall intensity. Univariate analysis of variance showed that runoff rate, rainfall intensity, slope gradient, and slope length had significant effects on interrill erosion rate and that their interactions were significant at p = 0.01. An improved interrill erosion equation was constructed by analyzing the relationships of sediment concentration with rainfall intensity, slope length, and slope gradient. In the improved interrill erosion equation, the runoff rate and slope factor are the same as in the interrill erosion equation in the Water Erosion Prediction Project (WEPP), with the weight of rainfall intensity adjusted by an exponent of 0.22 and a slope length term added with an exponent of −0.25. Using experimental data from WEPP cropland soil field interrill erodibility experiments, it has been shown that the improved interrill erosion equation describes the relationship between interrill erosion rate and runoff rate, rainfall intensity, slope gradient, and slope length reasonably well and better than existing interrill erosion equations.
登录
查看更多内容
DOI：
10.13031/2013.30109
发表时间：
1986-01-01
期刊：
Transactions of the ASAE
影响因子：
--
作者：
Watson, D. A.;Laflen, J. M.
通讯作者：
Laflen, J. M.
影响因子：
2.9
作者：
Chaplot, VAM;Le Bissonnais, Y
通讯作者：
Le Bissonnais, Y
DOI：
10.2136/sssaj1984.03615995004800050040x
发表时间：
1984-01-01
影响因子：
2.9
作者：
MEYER, LD;HARMON, WC
通讯作者：
HARMON, WC
DOI：
10.13031/2013.34475
发表时间：
1981-01-01
期刊：
TRANSACTIONS OF THE ASAE
影响因子：
--
作者：
MEYER, LD
通讯作者：
MEYER, LD
影响因子：
6.5
作者：
Valmis, S;Dimoyiannis, D;Danalatos, NG
通讯作者：
Danalatos, NG