基于KINEROS2模型的降雨和坡长因子对土壤侵蚀过程影响的研究

发布时间：2018-04-14 20:00

本文选题：KINEROS模型 + 坡长　；参考：《水土保持学报》2017年04期

【摘要】：以不同坡长(1,5,10,15,20m)径流小区在不同降雨强度(25,50,75mm/h)下人工模拟降雨试验为基础,通过KINEROS2模型对坡面侵蚀过程及侵蚀量进行模拟,对比分析不同坡长、降雨强度及其交互作用对坡面土壤侵蚀过程及侵蚀量的影响,并评价KINEROS2模型的模拟效果及适用性。结果表明:坡长与总径流量呈一元线性关系(R20.990),与总侵蚀量呈幂函数关系(R20.900);降雨强度与总径流量、总侵蚀量之间呈倍数关系增加,且总侵蚀量的增率是总径流量增率的2~3倍;坡长与降雨强度之间存在交互作用,坡长、降雨强度和降雨强度-坡长交互作用与径流量、侵蚀量呈显著相关关系,并在坡面径流和侵蚀过程中表现为正效应。坡面径流量主要受坡长、降雨强度和降雨强度-坡长交互作用三者综合影响。坡面侵蚀量主要受坡长和降雨强度-坡长交互作用的影响极显著,受降雨强度的影响较显著。KINEROS2模型对径流过程的模拟优于侵蚀过程,对总侵蚀量的模拟优于总径流量,说明KINEROS2模型更适于对径流过程及总侵蚀量的模拟。从总体来看,KINEROS2模型对径流小区坡面土壤侵蚀过程及侵蚀量模拟效果较好,说明KINEROS2模型在中国西北干旱半干旱地区小区尺度上有较好的适用性。
[Abstract]:On the basis of artificial simulated rainfall experiment under different rainfall intensity of 2550 ~ 75mm / h in runoff plot with different slope length, the erosion process and erosion amount of slope surface were simulated by KINEROS2 model, and different slope lengths were compared and analyzed.The effects of rainfall intensity and its interaction on soil erosion process and erosion amount on slope surface were studied and the simulation results and applicability of KINEROS2 model were evaluated.The results show that the slope length has a linear relationship with the total runoff, and a power function between the slope length and the total runoff, and the relationship between the rainfall intensity and the total runoff, the total erosion is multiple, and the increase rate of the total erosion is 23 times of the total runoff.There is an interaction between slope length and rainfall intensity, and the interaction among slope length, rainfall intensity and rainfall intensity-slope length has a significant correlation with runoff and erosion, and is positive in runoff and erosion process.Slope runoff is mainly affected by slope length, rainfall intensity and the interaction of rainfall intensity and slope length.Slope erosion is mainly influenced by slope length and the interaction between rainfall intensity and slope length. The simulation of runoff process by KINEROS2 model is more significant than that by erosion process, and the simulation of total erosion amount is better than that of total runoff.It shows that KINEROS2 model is more suitable to simulate runoff process and total erosion.On the whole, the KINEROS2 model has a good simulation effect on soil erosion process and erosion amount on the slope surface of runoff plot, which indicates that KINEROS2 model is suitable for plot scale in arid and semi-arid areas of northwest China.
【作者单位】：北京林业大学水土保持学院水土保持国家林业局重点实验室;北京市水土保持工程技术研究中心;
【基金】：国家自然科学基金项目“不同地形特征下坡面氮磷迁移的物理过程解析与模拟”(51309008)
【分类号】：S157.1

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