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### 水库调节地区东江流域非一致性水文极值演变特征、成因及影响

1. 1.中山大学水资源与环境研究中心, 广东 广州 510275
2.华南地区水循环与水安全广东省普通高校重点实验室, 广东 广州 510275
3.中水珠江规划勘测设计有限公司, 广东 广州 510610
• 收稿日期:2012-08-22 修回日期:2013-01-04 出版日期:2013-07-20 发布日期:2013-07-20
• 作者简介:

作者简介：叶长青（1982-）,男,海南屯昌人,博士研究生,主要从事水文水资源方面研究。E-mail:yechangqing2001@hotmail.com

• 基金资助:
国家自然科学基金重大国际合作和重点项目（51210013,50839005）、水利部公益性行业科研专项经费项目专题（200901043-3）、广东省科技厅项目(2010B050300010)、广东省水利科技创新项目（2009-39）、中山大学重大项目培育和新兴交叉学科项目（10lgzd11）、国家重点基础研究发展计划（973）项目(2010CB428405)、广东省自然科学基金（S2011040005992）、国家自然科学基金（51209095）、国家自然科学基金项目（41001019）资助

### Changing Properties, Causes and Impacts of Non-stationary Extreme Stream Flow Under the Changing Environment of Hydraulic Engineering Regulated Basin in Dongjiang River, China

Chang-qing YE1,2(), Xiao-hong CHEN2(), Jia-ming ZHANG1,2, Li-juan ZHANG1,2, Lan KONG3

1. 1.Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou,Guangdong 510275, China
2.Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou,Guangdong 510275, China
3.China Water Resources Pearl River Planning Surveying ＆ Designing Co．Ltd,Guangzhou,Guangdong 510610,China
• Received:2012-08-22 Revised:2013-01-04 Online:2013-07-20 Published:2013-07-20

Abstract:

No "stationarity" existed any longer in the environmental background for the formation of runoff series. Designed by the existing engineering hydrologic analysis method will face the risk of distortion in design frequency caused by the ever-changing environment. We analyzed the statistical properties of hydrologic extreme flow for hydrologic station of Longchuan and Heyuan in Dongjiang river using 8 probability distribution functions. Estimate of parameters was performed using the maximum likelihood technique. Goodness of fit was done based on AIC, BIC and AICc for the optimal linear frequency distribution before and after environment change. And the rules and effects of variability for hydrologic extreme flow was discussed. The research results indicate that the non-stationary annual maximum daily flow series of stations in Dongjiang Basin show a descend trend that caused by rainfall and construction of water conservancy projects. Mixed tail distribution (LN2) at Longchuan and Heyuan stations were found to be the best fitting model. The optimal linear frequency distribution maintain consistency before and after environment change, but the impacts on fitting curve of flood series showed an overall performance as upper tail from "steep" to "gentle". The Changing properties and impacts of parameters to distribution are analyzed by the 30-year moving average method. Flood frequency analyses for Dongjiang river show that the maximum flow with a 0.01-annual probability (corresponding to 100-year flood peak under stationary conditions) over the 56-year record has ranged from a maximum discharge of 9 189 m3/s to a minimum of 2 305 m3/s at longchuan station; and has ranged from a maximum discharge of 11 125 m3/s to a minimum of 4 072 m3/s at Heyuan station. If the non-stationarity of series is not considered, the traditional method is still used for calculation. At the Longchuan and Heyuan Stations, the design flood magnitude will be overestimated. Compared with non-stationary flood series characteristics, the flood magnitude is smaller and the frequency is lower for the stationary "real" flood series characteristics caused by hydraulic engineering regulation and rainfall. After changes in the hydrological regime, the flood return period estimated before the change is often unable to well describe the flood frequency characteristics after environmental changes.

• P333