基于EOF的雅鲁藏布江流域干湿季降水变化的时空分异研究基于EOF的雅鲁藏布江流域干湿季降水变化的时空分异研究.pdf

Open Journal of Soil and Water Conservation 水土保持, 2014, 2, 37-42 Published Online December 2014 in Hans. /journal/ojswc /10.12677/ojswc.2014.24004 Analyzing Spatial and Temporal Distribution of Precipitation at Wet or Dry Season in Yarlung Zangbo River Basin Using Empirical Orthogonal Function 1 1 2 Xiongfei Wang , Sisi Chen , Jiaqi Zhang 1 College of Tourism and Geography Science, Yunnan Normal University, Kunming 2 College of Tourism and Environmental Sciences, Shanxi Normal University, Xi’an Email: 919753286@ th st th Received: Nov. 18 , 2014; revised: Dec. 1 , 2014; accepted: Dec. 10 , 2014 Copyright © 2014 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract According to the monthly precipitation data of 15 meteorological stations in the Yarlung Zangbo river basin during the period from 2000 to 2010, and using the method of empirical orthogonal function (EOF), we respectively calculated the spatial and temporal distribution characteristics of precipitation in wet and dry season and the time-coefficient series. The results showed that the EOF method was capable of revealing the spatial and temporal distributions of precipitation field for the Yarlung Zangbo river basin, with the first four EOFs reflecting the four vector distribution fields; furthermore, we can know that the cumulative contribution rate of precipitation is 99.84% at dry season and 89.81% at wet season. The main space distribution characteristic of dry or wet season precipitation is different distribution from west to e