不同土质中地下滴灌滴头流量敏感性因素分析  

Analysis of Sensitivity Factors of Subsurface Drip Irrigation Emitters Discharge under Different Textural Soils

作　　者：李刚[1] 白丹[2] 王晓愚[1] 

机构地区：[1]塔里木大学水利与建筑工程学院,新疆阿拉尔843300 [2]西安理工大学西北水资源与环境生态教育部重点实验室,陕西西安710048

出　　处：《节水灌溉》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)

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.

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 

分 类 号：S275.4[农业科学—农业水土工程] S275.6[农业科学—农业工程]