黄土高原丘陵沟壑区梯田边坡侵蚀过程对雨强的响应

发布时间：2018-03-25 13:13

  本文选题：降雨强度　切入点：径流　出处：《泥沙研究》2017年06期

【摘要】：为了进一步明确黄土高原水平梯田边坡在不同降雨强度下的侵蚀规律和细沟发育特征,选取陕西安塞县纸坊沟小流域土壤为试验材料,利用自制的试验模型槽,采用人工分层填筑方法,模拟野外最常见的单级梯田形态,在室内模拟降雨的条件下,设计了五组降雨强度(1.5、1.75、2.0、2.25、2.5 mm/min),研究了不同降雨强度对单级梯田的侵蚀规律和细沟发育的影响。结果表明:降雨强度对径流率和侵蚀速率的变化有着显著的影响,雨强≥2.0 mm/min时,径流率和侵蚀速率呈波动性增加;梯田边坡细沟长度、宽度和深度随雨强的增大而增大,其中细沟的长度能很好地反映细沟的发育过程,且与侵蚀速率之间存在着极显著的正相关关系;不同降雨强度下,梯田边坡坡面流速均呈先增大后稳定的趋势,坡面平均流速和雨强呈明显的幂函数关系;梯田边坡在侵蚀分为片状侵蚀、细沟侵蚀、细沟调整和崩塌四个阶段,且土壤侵蚀量与雨强之间有着明显的指数关系。
[Abstract]:In order to further clarify the erosion law and the characteristics of rill development of horizontal terraced slope in loess plateau under different rainfall intensity, the soil of Zhifanggou small watershed in Ansai County, Shaanxi Province was selected as the experimental material, and the self-made test model slot was used. The artificial stratified filling method is used to simulate the most common single-stage terraced fields in the field. Under the condition of indoor simulated rainfall, Five groups of rainfall intensity were designed, and the effects of different rainfall intensity on erosion law and rill development of single terrace were studied. The results showed that the rainfall intensity had significant influence on the change of runoff rate and erosion rate, and the rainfall intensity 鈮，

本文编号：1663272