摘要
为比较施加PAM后坡面水动力学过程的差异,采用人工模拟降雨试验,分析了不同雨强、不同坡度、不同土壤处理后的径流剪切力、水流功率和水流动能与坡面输沙率之间的关系。结果表明:土壤分离速率与径流剪切力、水流功率和水流动能3个水力参数之间均具有良好的线性正相关关系;施加PAM后红壤扰动土临界剪切力由0.77 Pa增加到1.47 Pa,临界水流功率由0.182 4 N/(m.s)增加到0.367 6 N/(m.s),临界水流动能由0.301 8 J增加到1.115 5 J;水流功率是其中描述土壤分离速率的最好参数,其复相关系数明显好于径流剪切力、水流动能与土壤分离速率的关系。
In order to compare the difference of the slope hydraulics processes for disturbed red soil when treated with PAM,stimulated rainfall experiments under different slopes,rainfall intensities and soil treatments were designed to investigate the relationship between runoff shear stress,flow power and flow kinetic energy with slope sediment transport rate respectively.The results show soil separate rate with runoff shear stresses,stream power and flow kinetic energy all have better linear positive relationship.When treated with PAM,the disturbed red soil critical shear stresses increase from 0.77 Pa to 1.47 Pa,critical stream power increases from 0.182 4 N/（m·s） to 0.367 6 N/（m·s）,and critical flow kinetic energy increases from 0.301 8 J to 1.115 5 J.Among three parameters the stream power is the best parameter used to represent soil separate rate,and its multiple correlation coefficient is obviously better than that of runoff shear stresses and flow kinetic energy with soil detachment rate.
出处
《长江科学院院报》
CSCD
北大核心
2010年第11期49-52,共4页
Journal of Changjiang River Scientific Research Institute
基金
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-219)
中央级公益性科研院所基本科研业务费(YWF0717/TB02)
关键词
PAM
扰动红壤
剪切力
水流功率
水流动能
PAM
disturbed red soil
shear stress
stream power
flow kinetic energy
