流域蒸散与地理坐标的关系——以中国云南南盘江流域为例OACSTPCD

Taking Nanpan River Basin in Yunnan,China as research area,the data from 32 rainfall stations,21 evaporation stations and 13 hydrological stations from 1980 to 2016 are utilized to analyze the relationship of basin evapotranspiration and sensitivity to geographical coordinates based on the Budyko-Fu equation.Key findings are as follows:(a)the actual evapotranspiration(AET)of Nanpan River Basin has significant negative correlations with latitude and elevation,with correlation coefficients of R = 0.860 7(α<0.01)and R = 0.600 3(α<0.05),respectively,and moreover,the potential evapotranspiration(PET)and latitude has same negative correlations;(b)the parameter m values for 13 sub-basins have negative correlations with longitude,latitude and elevation,and the m values are also affected simultaneously by longitude,latitude and altitude,in which,the latitude and elevation have strongest influence with correlation coefficients of R=-0.888 5(α<0.01)and-0.622 4(α<0.05),respectively;and(c)the sensitivity of both AET and evaporative ratio to m values all show linear correlations with latitude,with correlation coefficients of R = 0.847 6(α<0.01)and R = 0.522 2(α<0.1),respectively,and more specifically,the sensitivity of AET and evaporative ratio to dryness index of the 11 sub-basins in the western basin all has a nonlinear and quadratic polynomial relationship with latitude,that is,the spatial distribution of precipitation can affect aforementioned relationships.