Variability of interrill erosion at low slopes
Variability of interrill erosion at low slopes
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DOI：
10.1002/esp.2024
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Chandler, J. H.
中科院分区：
文献类型：
--
作者：
Armstrong, A.;Quinton, J. N.;Chandler, J. H.
为了估计农田土壤侵蚀，已经开发了许多模型和风险评估，其中一些包括对养分和污染物转移的估计。许多这些模型都有一个斜率项作为对颗粒转移的控制，转移的增加与斜率的增加相关。这是根据在各种斜坡上收集的数据，并使用相对较小的土壤水槽和物理原理，即重力在飞溅运输和流动中的作用。本研究采用实验室降雨模拟的大型土壤水槽调查细沟土壤侵蚀的粉质壤土下的降雨强度为47毫米h（-1）的3%，6%和9%的斜坡，这是在西北欧的农业用地的代表。结果显示：（1）重复试验的径流和泥沙浓度数据变化很大，这表明细沟间土壤侵蚀过程的复杂性;（2）在低坡度，与表面积连通性、土壤饱和度、水流模式和水深有关的过程可能比与重力有关的过程占主导地位。因此，这对在评估低坡度农田土壤侵蚀时使用风险评估和具有主导坡度项的土壤侵蚀模型提出了质疑。版权所有（C）2010约翰威利父子有限公司
Numerous models and risk assessments have been developed in order to estimate soil erosion from agricultural land, with some including estimates of nutrient and contaminant transfer. Many of these models have a slope term as a control over particle transfer, with increased transfer associated with increased slopes. This is based on data collected over a wide range of slopes and using relatively small soil flumes and physical principals, i.e. the role of gravity in splash transport and flow. This study uses laboratory rainfall simulation on a large soil flume to investigate interrill soil erosion of a silt loam under a rainfall intensity of 47 mm h(-1) on 3%, 6% and 9% slopes, which are representative of agricultural land in much of northwest Europe. The results show: (1) wide variation in runoff and sediment concentration data from replicate experiments, which indicates the complexities in interrill soil erosion processes; and (2) that at low slopes processes related to surface area connectivity, soil saturation, flow patterns and water depth may dominant over those related to gravity. Consequently, this questions the use of risk assessments and soil erosion models with a dominant slope term when assessing soil erosion from agricultural land at low slopes. Copyright (C) 2010 John Wiley & Sons, Ltd.