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引用本文:李相虎,任立良,张奇,王刚.蒸散发时间尺度转换在日降雨径流过程模拟中的应用.湖泊科学,2010,22(5):749-756. DOI:10.18307/2010.0518
LI Xianghu,REN Liliang,ZHANG Qi,WANG Gang.Application of evapotranspiration temporal scale transformation method in daily rainfall-runoff simulation. J. Lake Sci.2010,22(5):749-756. DOI:10.18307/2010.0518
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蒸散发时间尺度转换在日降雨径流过程模拟中的应用
李相虎1, 任立良2, 张奇1, 王刚3
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, 南京 210008;2.河海大学水文水资源与水利工程科学国家重点实验室, 南京 210098;3.南京大学地球科学与工程学院, 南京 210093
摘要:
针对目前研究蒸散发时间尺度转换方面的不足, 构建了月蒸散发时间尺度转换模型, 对淮河史灌河流域黄泥庄小流域1982-1987年月蒸散发能力进行逐栅格解集, 并与改进后的AFFDEF分布式水文模型耦合进行日径流过程模拟.结果显示:解集产生的日蒸散发能力随时间在平均值附近波动变化, 能很好地体现日蒸发量的时间变异特点;模拟的日径流过程的精度较高, 平均Nash效率系数在80%以上, 径流深相对误差都在10%以内, 平均泊松相关系数为0.912, 模拟流量过程曲线与实测值匹配的较好;经与采用平均解集模式的模拟结果对比发现, 耦合蒸散发时间尺度转换模型后的模拟精度与前者大体相当, 部分指标略优于前者.蒸散发时间尺度转换模型解集产生的日蒸散发量序列能够反映日蒸发量的时间变异特点, 更能满足区域日降雨径流过程模拟的需要, 可为解决资料匮乏区域水文模拟提供一个新途径.
关键词:  蒸散发  时间尺度转换  AFFDEF模型  水文过程  黄泥庄流域
DOI:10.18307/2010.0518
分类号:
基金项目:中国科学院知识创新工程重要方向项目群(KZCX2-YW-Q10-3), 中国科学院知识创新工程重要方向项目(KZCX2-YW-337)联合资助
Application of evapotranspiration temporal scale transformation method in daily rainfall-runoff simulation
LI Xianghu1, REN Liliang2, ZHANG Qi1, WANG Gang3
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. China;3.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, P. R. China
Abstract:
For further study on potential evapotranspiration downscaling, a model was established to downscales the potential evapotranspiration time step from monthly to daily. Downscaling the monthly potential evapotranspiration to daily sequences during 1982-1987 for every grid in Huangnizhuang basin, and coupling with the improved AFFDEF hydrological model to simulate the daily stream flow. The results showed that downscaled daily evapotranspiration fluctuate near the mean value along with the time, and can reflect the time variation characteristic of actual daily evapotranspiration. The performances of model simulating the daily discharge was very good:the average Nash-Sutcliffe efficiency coefficient was larger than 80%, and the relative runoff depth error were smaller than 10% and 0.912 for the average correlation coefficient. Compared with the results by the mean downscale method, the hydrological model coupled with the temporal scale transformation model for evapotranspiration can get the similar simulation precision, and some evaluation indexes were better than the former. In a word, the downscaled daily evapotranspiration from the temporal scale transformation model can not only reflect the time variation characteristic of actual daily evapotranspiration, but also satisfy the need of regional rainfall-runoff processes simulation, and was a new approach for solve the problem of scarce daily data in hydrological processes simulation.
Key words:  Evapotranspiration  temporal scale transformation  AFFDEF model  hydrological processes  Huangnizhuang basin
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