Modeling spatial distribution of pan evaporation based on quinat-variate thin plate spline function
LIU Zhi-Gong-；TimR.McVicar；TomG.VanNiel；Yang-Qi-Ke-；Li-Dui-；Mu-Xin-Min
1.Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resource,712100,Yangling,Shaanxi;2.Urumuqi Meteorological Satellite Ground Station,National Satellite Meteorological Center,830011,Urumuqi;3.Graduate School of Chinese Academy of Science 100049,Beijing:China;4.CSIRO Land and Water,Canberra,Australia
Abstract：Spatial distribution of pan evaporation(EE) depending on multiple factors such as radiation,（vapor） pressure and wind is a crucial parameter for geographic models and climatic models,and also a key to（environmental） management.However the weather observation stations normally distribute sparsely and irregularly on the ground.The techniques to interpolate available point data to estimate the value of any location is demanded.This paper introduces the process to interpolate monthly EE data of 53 stations for the period of 1980 to 2000 to create 252 EE surfaces in Coarse Sandy Hilly Catchments of Loess Plateau.Quinat-variate partial thin plate spline models were developed in which vapor pressure deficit（Pd）,net radiation（Pn） and wind speed（wind） were used as three covariate sub-models.GCV statistics indicate that the resultant evaporation surfaces hold high fidelity and smoothness.The lapse rates（evaporation changing rate with each covariate） showed that: the dependence of EE on Rn has no strong seasonal trend although at the equinoxes it is slightly big,whereas the dependence of EE on pd has an obvious trend with strongest influence in summer,and wind speed has more relative influence in winter.
中国科学院知识创新重要方向项目“黄土高原水土保持的区域环境效应”(KZCX3-SW-421);中澳合作项目ACIAR PROJECT“Regional impacts of re-vegetation on water resources of the Loess Plateau,China and Middle and Upper Murrumbidgee Catchment,Australia”(LWR1/2002/018)
引用本文:
刘志红1,2,3；TimR.McVicar4；TomG.VanNiel4；杨勤科1；李锐1；穆兴民1. 基于5变量局部薄盘光滑样条函数的蒸发空间插值[J]. 中国水土保持科学, 2006, 4(6): 23-30.
LIU Zhi-Gong-；TimR.McVicar；TomG.VanNiel；Yang-Qi-Ke-；Li-Dui-；Mu-Xin-Min. Modeling spatial distribution of pan evaporation based on quinat-variate thin plate spline function. SSWCC, 2006, 4(6): 23-30.
2006, Vol. 4 
