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黄土坡面细沟流土壤侵蚀机理研究
马小玲1; 张宽地1,2; 董旭1; 杨明义2; 杨帆1
2016
Source Publication农业机械学报
Volume47Issue:9Pages:134-140
Abstract

细沟侵蚀是黄土坡面最主要的侵蚀方式之一,土壤剥离过程是细沟侵蚀中的重要环节。采用6 种坡度( 2°、
4°、6°、8°、10°、12°) 、5 种流量( 8、16、24、32、40 L/min) 组合冲刷试验,系统研究了黄土坡面细沟流土壤剥蚀率与水
动力学和床面形态的耦合关系。结果表明: 土壤剥蚀率与流量、坡度均呈幂函数增加关系,且坡度对土壤剥蚀率的
影响更大; 不同类型土壤无量纲剥蚀率与无量纲流速之间存在分区现象,表明土壤侵蚀受到除泥沙粒径外其他因
素的影响; 不同类型土壤无量纲剥蚀率与无量纲切应力双对数函数呈线性增加关系,且不存在分区; 不同类型土壤
无量纲剥蚀率与无量纲单位水流功率存在分区; 土壤剥蚀率随跌坑发育系数的增加呈幂函数增加趋势,而土壤剥
蚀率随L /H 增加呈幂函数减小趋势,说明床面形态越加复杂、跌坑发育越加成熟,土壤侵蚀就越剧烈。研究结果对
细沟水流侵蚀机理的探究具有一定的理论价值,对黄土坡面水土流失治理及生态修复均具有一定的指导意义。

Other Abstract

Rill erosion is one of the most important slope erosion in loess area,and soil detachment
process is an important link of rill erosion. However,the existing studies only are based on a single soil
conditions,while the simple relationship between soil detachment rate and water dynamics cannot fully
reflect the coupling mechanism of the soil detachment rate under different types of soil. More importantly,
the existing research involves little on the relationship between the detachment rate and bed surface
morphology. The article adopted the combination of six kinds of slope gradients ( 2°,4°,6°,8°,10°
and 12°) and five discharges ( 8 L /min,16 L /min,24 L /min,32 L /min,40 L /min) to do scouring
experiment. The results showed that: soil detachment rate had power function relationship with discharge
and slope,and slope had a greater influence than discharge; Different types of non-dimensional soil
detachment rate and non-dimensional unit stream power had zoned phenomenon with non-dimensional flow
velocity which showed that soil detachment had other influence factors except diameter of particles; Nondimensional
soil detachment rate and non-dimensional shear stress double-log function had a linear
increase relationship,and there was no partition; Soil detachment rate had a trend of increase powefunction with the increase of down hole development coefficient,and the soil detachment rate had a power
function decreasing trend with the L /H increases. This results show that the more complex bed surface
morphology increased,the more mature down hole developed increasingly and the more intense soil
detachment is. The results of the study have some theoretical value to the mechanism of sediment
transport on rill flow erosion,moreover it has a certain guiding significance on loess slope surface soil
detachment control and ecological restoration.

Keyword黄土坡面 细沟侵蚀 细沟水动力学 土壤剥离率 床面形态
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8740
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学水利与建筑工程学院
2.西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
Recommended Citation
GB/T 7714
马小玲,张宽地,董旭,等. 黄土坡面细沟流土壤侵蚀机理研究[J]. 农业机械学报,2016,47(9):134-140.
APA 马小玲,张宽地,董旭,杨明义,&杨帆.(2016).黄土坡面细沟流土壤侵蚀机理研究.农业机械学报,47(9),134-140.
MLA 马小玲,et al."黄土坡面细沟流土壤侵蚀机理研究".农业机械学报 47.9(2016):134-140.
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