近50年鄱阳湖流域实际蒸发量的变化及影响因素

长江流域资源与环境 >> 2010, Vol. 19 >> Issue (2): 139-.

近50年鄱阳湖流域实际蒸发量的变化及影响因素

刘健^1,2, 张奇^1*, 许崇育^1,3, 翟建青^1,2, 靳晓莉^1,2

1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室| 江苏南京 210008； 2.中国科学院研究生院| 北京 100039；3.奥斯陆大学地球科学系| 挪威奥斯陆）

出版日期:2010-02-20

CHANGE OF ACTUAL EVAPOTRANSPIRATION OF POYANG LAKE WATERSHED AND ASSOCIATED INFLUENCING FACTORS IN THE PAST 50 YEARS

LIU Jian^1,2| ZHANG Qi¹| XU Chongyu^1,3| ZHAI Jianqing^1,2| JIN Xiaoli^1,2

(1.Nanjing Institute of Geography and Limnology,State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing |210008, China； 2.Graduate University of Chinese Academy of Sciences, Beijing 100039, China； 3.Department of Geosciences,University of Oslo,P O Box 1047 Blindern, NO0316 Oslo, Norway)

Online:2010-02-20

摘要/Abstract

摘要：

流域的实际蒸发是水文循环和水量平衡的重要组成部分，分析鄱阳湖流域的实际蒸发对该流域水资源研究有重要意义。选取应用范围较广的互补相关蒸发模型，估算鄱阳湖流域9个气象站1955～2001年实际蒸发量，采用统计学方法分析该时段流域实际蒸发的年内变化特征。结果表明:流域蒸发年内呈单峰型变化，峰值出现在7月份；季节变化上，夏季最大，冬季最小，春季高于秋季。选用Db3小波函数分析9站蒸发量变化趋势,结果表明:该流域蒸发量在计算时段内呈现逐步下降趋势，1998年左右转折，之后下降速度变缓。与流域同期降水量、潜在蒸发量以及太阳辐射、温度、水汽压差和风速等气象要素的对比分析认为，实际蒸发量下降的主要是由太阳净辐射和风速的下降引起的.

Abstract:

Actual evapotranspiration of watershed is an important part of hydrological circle and water balance,and it is significant to analyze the actual evapotranspiration of Poyang Lake watershed to research its water resources.In this paper,complementary relationship evapotranspiration model was selected to estimate the actual evapotranspiration of 9 meteorological stations from 1955 to 2001.For studying the seasonal variation of the watershed evapotranspiration,statistical method was adopted.The results show that the annual actual evapotranspiration presents singlepeaked pattern and its peak value occurs in July;the evapotranspiration in summer is larger than that in spring and autumn,and it is the smallest in winter.For analyzing the longterm trend of 9 stations Db3 function of wavelet method was selected,and the results indicate that the evapotranspiration in the area declines during the studying period. It turns to descend at about 1998,and the rate becomes very slow thereafter.After comparison among precipitation,potential evapotranspiration and meteorological elements (net solar radiation,temperature,vapor pressure difference and wind velocity) in Poyang Lake watershed during the same period,it is inferred that the change of actual evapotranspiration is a result of multiple factors,among which the net solar radiation and wind velocity are the main factors.

Key words: actual evapotranspiration/complementary relationship evapotranspiration model/trend/wavelet analysis/ Poyang Lake watershed

刘健, 张奇, 许崇育, 翟建青, 靳晓莉. 近50年鄱阳湖流域实际蒸发量的变化及影响因素[J]. 长江流域资源与环境, 2010, 19(2): 139-.

LIU Jian, ZHANG Ai, HU Chong-Yo, DI Jian-Jing, JIN Xiao-Chi. CHANGE OF ACTUAL EVAPOTRANSPIRATION OF POYANG LAKE WATERSHED AND ASSOCIATED INFLUENCING FACTORS IN THE PAST 50 YEARS[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2010, 19(2): 139-.

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