摘要
生产建设项目产生的弃土弃渣堆积体成为人为水土流失的主要来源,准确、快速测算其水土流失量是迫切的社会需求。本研究采用室内人工模拟降雨试验方法,研究了黄土区工程土石混合堆积体土质可蚀性K值,提出了工程堆积体土壤侵蚀标准试验小区定义,坡度设定为25°。以此为标准,测算出黄土质重壤土娄土纯土体,石砾含量10%、20%、30%土石混合体的可蚀性K值分别为0.0224、0.0208、0.0188、0.0074 t·hm2·h/(hm2·MJ·mm);分析得出,随着石砾含量增加,土石混合土质可蚀性K值呈线性减小。以纯土体类型为分析基准,建立了不同含石量条件下的土质可蚀性因子Ki与纯土体土壤可蚀性K0和石砾含量Pi之间的简化转化关系式,以便在有关地区参考应用。
Engineering accumulations induced by production and construction projects are the main source of the man-made soil and water loss.Quick and accurate calculation of the quantity of soil and water loss from the accumulations is of great realistic significance and an urgent need for society.By indoor rainfall simulateor experiment,the soil erodibility factor for the earth-rock engineering accumulation in loess areas is studied.Soil erosion standard unit plot of the earth-rock engineering accumulation is defined and the slope gradient is 25 °.With this standard,the estimated soil erodibility factor for pure soil and the 10%,20% and 30% earth-rock volumes are 0.0224,0.0208,0.0188 and 0.0074 t· hm2 · h/（hm2· MJ· mm）,respectively.Soil erodibility factor for the earth-rock engineering accumulation decreases linearly with the increase of the rock content.Based on the analysis of the pure soil type,the simplified conversion relationship of soil erodibility of different rock contents Kiwith the pure soil erodibility K0 and rock content Pi is established which can be used as the reference in other areas.
出处
《泥沙研究》
CSCD
北大核心
2014年第2期49-54,共6页
Journal of Sediment Research
基金
水利部公益性行业专项"生产建设项目水土流失测算共性技术研究"(201001036)
水利部公益性行业专项"工程开挖面与堆积体水土流失测算技术研究"(201201048)
黄土高原土壤侵蚀与旱地农业国家重点实验室专项(10502-T1)
关键词
黄土区
生产建设项目
工程土石混合堆积体
侵蚀量
可蚀性K值
loess area
production and contribution project
earth-rock engineering accumulation
sediment yield
soil erodibility factor
