| 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。 |
| 关键词: 干旱内陆区 地下水位 空间插值 ArcGIS 武威盆地 |
| DOI：10.11841/j.issn.1007-4333.2010.05.020 |
| 投稿时间：2010-03-22 |
| 基金项目:水利部公益基金(200801104); 国家自然科学基金资助项目(50909094)第一作者:秦俊桃,硕士研究生,E-mail:renmu2007@163.com通讯作者:冯绍元,教授,博师生导师,主要从事水资源与水环境研究,E-mail:fsy@cau.edu.cn |
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| Applications of spatial interpolation methods forgroundwater levels in arid inland area |
|
QIN Jun-tao, FENG Shao-yuan, HUO Zai-lin, KANG Shao-zhong, WANG Feng-xin
|
| (Center for Agricultural Water Research in China,China Agricultural University,Beijing 100083,China) |
| Abstract: |
| 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. |
| Key words: arid inland area groundwater levels spatial interpolation ArcGIS Wuwei basin |
