几种地下水位空间插值方法在干旱内陆区的应用比较  

Applications of spatial interpolation methods for groundwater levels in arid inland area

作　　者：秦俊桃[1] 冯绍元[1] 霍再林[1] 康绍忠[1] 王凤新[1] 

机构地区：[1]中国农业大学中国农业水问题研究中心,北京100083

出　　处：《中国农业大学学报》2010年第5期124-129,共6页Journal of China Agricultural University

基　　金：水利部公益基金(200801104);国家自然科学基金资助项目(50909094)

摘　　要：以西北干旱内陆区石羊河流域中游武威盆地为例,分析比较地统计学方法常用的8种空间插值方法在地下水位插值中的应用效果。结果表明:反距离加权法(IDW)插值误差较大,容易出现"牛眼"现象;多项式插值(GPI和LPI)要求资料的全局或局部趋势性很强,导致在对离群值插值时,误差偏大;径向基函数插值(Rspline和Tspline)对数据的要求较高,需要数据变化范围小,否则其插值结果差异很大;普通克里格插值(OK)效果较好,尤其对离群值的处理表现出较明显的优势。其中OK、泛克里格插值(UK)插值较简单克里格插值(SK)插值误差较小,且插值结果较光滑,符合实际地下水位变化趋势。The Wuwei basin in middle reaches of the Shiyang River basin was selected to analyze the application of eight spatial interpolation methods to groundwater level variation based on ArcGIS.The results showed that IDW method has a higher error and is prone to appear ＂buphthalmos＂.The data must present a strong global or local trendy when used for polynomial interpolation,which results in larger errors for outlier cutoffs data.Radial Basis Function needs data with little change.However,the results from Kriging method fit well,especially for outlier cutoffs.Compared with SK,the errors of OK and UK are smaller with the smooth simulated groundwater water levels,which satisfy the actual trend of groundwater levels.

关 键 词：干旱内陆区 地下水位 空间插值 ARCGIS 武威盆地 

分 类 号：TV211.12[水利工程—水文学及水资源]