期刊：
Proceedings of the International Association of Hydrological Sciences,2008年18(1):204-213 ISSN：2199-8981
通讯作者：
Wu, Yijin
作者机构：
[Wu, Yijin] Cent China Normal Univ, Sch Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Becker, Stefan] Univ Wisconsin, Dept Geog, Oshkosh, WI 54901 USA.;[King, Lorenz; Hartmann, Heike] Univ Giessen, Inst Geog, Giessen, Germany.;[Kung, Hsiang-Te] Memphis State Univ, Dept Earth Sci, Memphis, TN 38152 USA.;[Jiang, Tong] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China.
通讯机构：
[Wu, Yijin] C;Cent China Normal Univ, Sch Urban & Environm Sci, Wuhan 430079, Peoples R China.
关键词：
Frequency;Precipitation days;Trends;Yangtze river basin.
摘要：
This paper explores the frequency of precipitation days to better understand flood potential by using different percentiles in the Yangtze River basins from 1950 to 2000. The positive (increasing) trends of the precipitation days at the 75th and the 95th percentile are analysed on both yearly and decadal scales. Some interesting facts have been revealed through this study. It is observed that the precipitation days at the 75th percentile increase more than that of the 95th percentile in the basin. This explains that the yearly increasing precipitation is due to excessive rains and not heavy rains. Also, through the trends (positive and negative), the variation of yearly precipitation days can be classified.
期刊：
KAM: 2008 INTERNATIONAL SYMPOSIUM ON KNOWLEDGE ACQUISITION AND MODELING, PROCEEDINGS,2008年:878-881
通讯作者：
Wu, Yijin
作者机构：
[Yuan, Xuying; Liang, Shuang; Wu, Yijin] Cent China Normal Univ, Urban & Environm Sci Dept, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, Yijin] C;Cent China Normal Univ, Urban & Environm Sci Dept, Wuhan 430079, Peoples R China.
摘要：
Watershed, as it comprehensively represents any part of water resource on our land, is considered the most appropriate units not only for the assessment of water environment, analysis and usage of water resources, but also for the management of water quality. Therefore, many scholars use watershed management to deal with the arising water problems and maintain sustainable development at watershed scale. Considering the complication and uncertainty of watershed system, previous scholars began to use various newly-built models to fulfill the task of watershed management, that is, the multi-objective optimization watershed management models. These models enable us to view watershed management from environmental, economical and social aspects. Base on the study of these models, this paper comprehensively concludes the mechanics, feature and methods of the models. Especially, we analysis four applications of multi-objective optimization models in watershed management. Finally, we analysis the problems of the existing models and express our expectation of the development of multi-objective optimization watershed management models in the future.
