Spatial Variability of Regional Water Requirement and Water Deficient Ratio

摘要

The spatial variability of regional water requirement (WR) and water deficient ratio (WRD) are studied with geostatistics.Taking the WR and WDR in 2000 and 2010 year as examples,which are from Dianzhong district,Yunnan Province,China,the suitability with geostatistics is analyzed theoretically.The WR is close to the log normal distribution,while the WDR is close to the normal distribution.Both have great spatial variability and are mainly influenced by structure factors.Their isotropic variograms can be described with sphere models and exponential models.The variables show complicated anisotropic properties combining geometric anisotropy and zonal anisotropy.The relativity of WR between 2000 and 2010 keeps constant at different scales,but the relativity of WDR varies with the distance.The spatial distributions of the variables are interpolated with cokriging and their factors are analyzed.