摘要
利用多喷头组合喷洒试验研究了分布均匀系数ＤＵ 与喷灌均匀系数ＣＵ 之间的关系。试验表明，ＤＵ 随ＣＵ的增大而线性增加，当ＣＵ等于规范规定值７５％ 时，ＤＵ值约为６６％ 。通过田间试验探讨了喷灌均匀系数对水量在土壤中分布均匀程度的影响。发现喷灌水量在土壤中的分布比其在地表的分布均匀得多，这一结果为合理降低喷灌均匀系数设计值提供了一个新的研究空间。该文还对作物冠层对喷灌水量分布的影响进行了田间试验，结果指出，冠层截留可以使喷灌水量分布的均匀性得到一定程度的改善。
Overlapped sprinkler water distributions were tested to determine the relationship between Distribution Uniformity ( DU ) and Christiansen Uniformity Coefficient ( CU ). The results demonstrated that DU increases linearly with an increase of CU . The value of DU approximates 66% when CU equals the required value of 75% by the standard. Field experiments were conducted to observe the spatial distributions of soil water content under sprinkler irrigation. We found that the water was more uniformly distributed in the soil than that measured on the ground surface. The influences of corn canopy on sprinkler water application pattern were also studied by field experiments. Sprinkler water pattern may be modified by crop canopy and the water uniformity below canopy is usually greater than that above canopy.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
1999年第4期78-82,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金!(59779025)
关键词
喷灌
土壤含水率
作物冠层
CU
DU
水量分布
sprinkler irrigation
Christiansen uniformity coefficient
distribution uniformity
soil water content
crop canopy
