文章摘要
顾小杰, 陈晓燕, 韩珍, 李彦海, 陈仕奇.紫色土细沟剥蚀率对近地表水流作用的响应[J].水土保持学报,2021,35(3):16~22
紫色土细沟剥蚀率对近地表水流作用的响应
Response of Rill Detachment Rate of Purple Soil to Subsurface Water Flow
投稿时间:2020-11-18  
DOI:10.13870/j.cnki.stbcxb.2021.03.003
中文关键词: 细沟剥蚀率  沟长  含沙量  近地表水流  细沟侵蚀  紫色土
英文关键词: rill detachment rate  rill length  sediment concentration  subsurface water flow  rill erosion  purple soil
基金项目:国家自然科学基金项目(41571265);重庆市技术创新与应用示范(社会民生类重点研发)项目(cstc2018jscx-mszdX0061)
作者单位E-mail
顾小杰, 陈晓燕, 韩珍, 李彦海, 陈仕奇 西南大学资源环境学院, 重庆 400716 c400716@126.com 
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中文摘要:
      近地表水流的存在会加剧土壤侵蚀过程,剥蚀率是土壤侵蚀预报模型的重要物理参数,其对近地表水流的响应值得进一步研究。采用限定性细沟模拟冲刷试验,探讨不同工况条件(3个近地表水流饱和深度5,10,15 cm;3个坡度5°,10°,15°;3个流量2,4,8 L/min)下紫色土细沟剥蚀特征。结果表明:不同近地表水流饱和深度下细沟剥蚀率随沟长和含沙量分别呈指数和线性下降,剥蚀能力在近地表水流饱和深度为15 cm时最大,随着近地表水流饱和深度减小而减小;多元非线性回归方程分析表明,细沟剥蚀率与流量、坡度和近地表水流饱和深度均呈正相关关系,其标准化系数分别为1.14,0.72,0.36,说明细沟剥蚀率在近地表水流存在的条件下对流量的敏感性大于坡度。研究结果为紫色土近地表水流作用下细沟侵蚀机理提供一定的理论依据。
英文摘要:
      The existence of subsurface water flow will aggravate the process of soil erosion. Soil detachment rate is an important physical parameter of the soil erosion prediction model, and the response of detachment rate to subsurface water flow is worthy to study in further. The characteristics of rill detachment of purple soil under different conditions (three subsurface water saturation depths of 5, 10 and 15 cm, three slope gradients of 5°, 10° and 15°, and three flow discharges of 2, 4 and 8 L/min) were studied by using limited rill simulation erosion test. The experimental results showed that the rill detachment rate decreased exponentially and linearly with the gully length and sediment concentration at different saturation depths of subsurface water, respectively. Detachment capacity reached its maximum value at subsurface water saturation depth of 15 cm and decreased with the decreasing of saturation depth of subsurface water. The multiple nonlinear regression equations showed the rill detachment rate was positively correlated with flow discharge, slope gradient and saturation depth of subsurface water, and the standardized coefficients were 1.14, 0.72 and 0.36, respectively, indicating that the rill detachment rate was more sensitive to flow discharge than slope gradient under the condition of subsurface water flow. The study provides some theoretical basis for the rill erosion mechansim under the effect of subsurface water flow in purple soil.
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