各向异性河床地形空间插值方法比较研究
Comparative Study of Riverbed Topography Spatial Interpolation Methods on Anisotropy
投稿时间:2020-12-17  修订日期:2020-12-17
DOI:
中文关键词:  空间插值  河床地形  各向异性  样本密度  栅格尺度  闽江下游
英文关键词:spatial interpolation  riverbed topography  anisotropy  sample density  grid scale  the lower reaches of Min River
基金项目:福建省自然科学(2020J01319);国家自然科学(41877167)
作者单位邮编
方艺辉 福建商学院信息工程学院
福建师范大学地理科学学院 
350012
陈兴伟 福建师范大学地理科学学院湿润亚热带山地生态国家重点实验室培育基地 
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中文摘要:
      河床地形是有关河流水环境管理、航道整治、生态保护等研究的重要基础数据,空间插值方法是生成河床地形的主要方法之一。为更好地比选反映各向异性对河床地形空间插值方法的影响,以闽江下游河床地形为研究对象,选取了反距离权重、克里格、样条函数和顾及各向异性的椭圆反距离权重等四种方法,从断面间距和栅格尺度两个方面,分析各向异性对河床地形空间插值的影响。结果表明,当断面间距较小或栅格尺度较大时,椭圆反距离权重方法相对于其他方法模拟精度略有优势;当断面间距较大和栅格尺度较小时,优势较为突出。也即由于椭圆反距离权重方法更好反映了河床地形的各向异性特点,是河床地形空间插值比较适用的方法。
英文摘要:
      Riverbed topography is an important basic data for the study of river water environment management, waterway regulation and ecological protection. Spatial interpolation is one of the main methods to generate riverbed topography on the basis of sample data. In order to better reflect the anisotropy on the riverbed terrain spatial interpolation method, four typical methods including Inverse Distance Weighting (IDW), Kriging, Spline and Elliptical Inverse Distance Weighting (EIDW, the anisotropic form of IDW), were selected for spatial interpolation simulation. The lower reaches of the Min River was chosen as the study area. The influence of anisotropic on simulation results of riverbed topography spatial interpolation was analyzed from crossing section spacing and grid scale. The results show EIDW has slight advantage over other methods in simulation accuracy as the crossing section spacing is small or the grid size is large. The advantage is prominent as the crossing section spacing is larger and the grid size is smaller. EIDW is a more suitable method for the riverbed terrain spatial interpolation since it takes into account the influence of riverbed anisotropy on the spatial interpolation and better reflects the anisotropy of the riverbed terrain. Considering the effect of anisotropy on the spatial interpolation of riverbed topography, the simulation accuracy can be improved to some extent.
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