摘要
为了利用化学措施防治工程水土流失,研究了聚丙烯酰胺(PAM)对扰动红壤土壤可蚀性及临界剪切力的影响。采用室内人工模拟降雨试验,探讨了5o、10o、15o、20o、25o5种坡度,0.8、1.1、1.4mm/min3种雨强下不同土壤处理后坡面水动力学参数、径流输沙率与流量、土壤可蚀性及临界剪切力的变化关系。试验结果表明,在相同的径流流量下,对照的输沙率是施加PAM后的300倍;施加PAM后,红壤扰动土的可蚀性由13.223g/(min.N)降低到0.2693g/(min.N),径流的临界剪切力大小由0.77N/(m2.min)增加到1.47N/(m2.min)。施加PAM可显著降低土壤可蚀性,增加径流临界剪切力。研究成果为PAM应用于工程水土流失防治提供了一定的理论依据。
For applying chemical measures to prevent projects soil and water loss,studying the effects of polyacrylamide(PAM) on soil erodibility and critical shear stresses of the red disturbed soil,stimulated rainfall experiments were conducted in the laboratory with 5 slope degrees as 5o,10o,15o,20o,25o and 3 rainfall intensities as 0.8 mm/min,1.1 mm/min,1.4 mm/min.The characteristics of the slope hydrodynamics parameters,relationships between runoff sediment transport rate and flow volume,variation of soil erodibility and critical shear stresses were analyzed with different soil treatments.The results showed that the sediment transport rate without PAM was 300 times larger than that with PAM when the runoff flow volumes were the same.The soil erodibility decreased from 13.223 g/(min.N) to 0.2693 g/(min.N),the runoff critical stresses increased from 0.77 N/(m2.min) to 1.47 N/(m2.min) with the application of PAM to the red soil.This means that the application of PAM can decrease the soil erodibility remarkably and increase the critical stresses.The results will provide theory basis for application of PAM to engineering soil and water loss prevention.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第7期45-49,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
中央级公益性科研院所基本科研业务费"新型水保材料在防治开发工程边坡水土流失的试验研究"(YWF0717/TB02)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金资助(10501-219)
关键词
土壤
侵蚀
剪切力
水土保持
PAM
soils
erosion
shear stress
soil conservation
PAM