摘要
为研究不同土壤质地条件下地下滴灌滴头流量变化的敏感程度,分别对工作压力、土壤容重和土壤初始含水率这3个因素采用求偏导的方法作为滴头流量对各因素的敏感性指标进行计算分析。结果表明:工作压力的变化对滴头流量影响显著,但滴头流量对压力变化的敏感性在不同土壤质地之间的差异并不大,相同压力条件下,土壤质地越轻,滴头流量对压力变化的敏感性略高于质地越重的土壤;随着土壤容重和土壤初始含水率的增大,滴头流量对二者变化的敏感性逐渐减弱;土质越轻,土壤容重与含水率变化对滴头流量的影响越显著;滴头流量对不同土质的敏感性明显大于对容重变化的敏感性。上述结论对地下滴灌系统水力计算以及地下滴灌产品开发具有一定的参考价值。
In order to study the sensitivity of SDI emitter discharge under different textural soils,three factors,including work pressure,soil bulk density and initial soil water content,are analyzed as sensitivity indexes through applying the method of seeking partial derivative.The results show that the effect of work pressure change on emitter discharge is evident but the differences of sensitivity of SDI emitter discharge to pressure change among different textural soils are not obvious.At the same work pressure,the lighter textured soil,the slightly higher sensitivity of SDI emitter discharge to pressure change.When soil bulk density or initial soil water content is increased,the respective sensitivity of SDI emitter discharge to both changes reduces gradually.The lighter textured soil,the more significantly sensitivity of emitter discharges to changes of soil bulk density and water content.The sensitivity of emitter discharges to different soil textures is more obviously greater than that of emitter discharges to various soil densities.Conclusions above are of great significance for studying hydraulic calculation and product development of SDI system.
出处
《节水灌溉》
北大核心
2011年第1期14-17,共4页
Water Saving Irrigation
基金
国家自然科学基金资助项目(50979089
50549018)
塔里木大学校长基金自然科学项目(TDZKBS1001)
关键词
地下滴灌
滴头流量
土壤质地
求偏导数法
敏感性指标
subsurface drip irrigation
emitter discharge
soil texture
partial derivative method
sensitivity index
