河流水情对河流生态系统起着决定性作用,以河流的变化范围法(Range of Variability Approach,RVA)来分析建坝对河流水文情势的影响,这对保护河道生物群和河流生态的完整性十分必要。应用变化范围法评估汉江中游襄阳站和宜城站1952—201...河流水情对河流生态系统起着决定性作用,以河流的变化范围法(Range of Variability Approach,RVA)来分析建坝对河流水文情势的影响,这对保护河道生物群和河流生态的完整性十分必要。应用变化范围法评估汉江中游襄阳站和宜城站1952—2013年的水文情势变化,以突变年1974年为界分析水文指标变化偏差率和水文改变度,使用流量的等级、频率、历时、发生的时间分布和变化率这5组水文指标进行分析评价,量化了汉江中游水文变化的程度。研究表明,由于丹江口大坝蓄水,引起襄阳和宜城站点的水位普遍降低,襄阳站的水位整体为高变化度,宜城站的水位整体为中变化度。分析结果可为汉江下游水文情势评价提供参考,为水资源管理提供技术支撑。展开更多
Taking the Lhasa River Basin above Lhasa hydrological station in Tibetan Plateau as a study area, the characteristics of the annual and monthly mean runoff during 1956-2003 were analyzed, based on the hydro-data of th...Taking the Lhasa River Basin above Lhasa hydrological station in Tibetan Plateau as a study area, the characteristics of the annual and monthly mean runoff during 1956-2003 were analyzed, based on the hydro-data of the two hydrological stations （Lhasa and Tanggya） and the meteorological data of the three meteorological stations （Damxung, Lhasa and Tanggya）. The trends and the change points of runoff and climate from 1956 to 2003 were detected using the nonparametric Mann-Kendall test and Pettitt-Mann-Whitney change-point statistics. The correlations between runoff and climate change were analyzed using multiple linear regression. The major results could be summarized as follows： （1） The annual mean runoff during the last 50 years is characterized by a great fluctuation and a positive trend with two change points （around 1970 and the early 1980s）, after which the runoff tended to increase and was increasing intensively in the last 20 years. Besides, the monthly mean runoff with a positive trend is centralized in winter half-year （November to April） and some other months （May, July and September）. （2） The trends of the climate change in the study area are generally consistent with the trend of the runoff, but the leading climate factors which aroused the runoff variation are distinct. Precipitation is the dominant factor influencing the annual and monthly mean runoff in summer half year, while temperature is the primary factor in winter season.展开更多
文摘河流水情对河流生态系统起着决定性作用,以河流的变化范围法(Range of Variability Approach,RVA)来分析建坝对河流水文情势的影响,这对保护河道生物群和河流生态的完整性十分必要。应用变化范围法评估汉江中游襄阳站和宜城站1952—2013年的水文情势变化,以突变年1974年为界分析水文指标变化偏差率和水文改变度,使用流量的等级、频率、历时、发生的时间分布和变化率这5组水文指标进行分析评价,量化了汉江中游水文变化的程度。研究表明,由于丹江口大坝蓄水,引起襄阳和宜城站点的水位普遍降低,襄阳站的水位整体为高变化度,宜城站的水位整体为中变化度。分析结果可为汉江下游水文情势评价提供参考,为水资源管理提供技术支撑。
基金National Basic Research Program of China, No.2005CB422006 National Natural Science Foundation of China, No.90202012 No.40561002
文摘Taking the Lhasa River Basin above Lhasa hydrological station in Tibetan Plateau as a study area, the characteristics of the annual and monthly mean runoff during 1956-2003 were analyzed, based on the hydro-data of the two hydrological stations （Lhasa and Tanggya） and the meteorological data of the three meteorological stations （Damxung, Lhasa and Tanggya）. The trends and the change points of runoff and climate from 1956 to 2003 were detected using the nonparametric Mann-Kendall test and Pettitt-Mann-Whitney change-point statistics. The correlations between runoff and climate change were analyzed using multiple linear regression. The major results could be summarized as follows： （1） The annual mean runoff during the last 50 years is characterized by a great fluctuation and a positive trend with two change points （around 1970 and the early 1980s）, after which the runoff tended to increase and was increasing intensively in the last 20 years. Besides, the monthly mean runoff with a positive trend is centralized in winter half-year （November to April） and some other months （May, July and September）. （2） The trends of the climate change in the study area are generally consistent with the trend of the runoff, but the leading climate factors which aroused the runoff variation are distinct. Precipitation is the dominant factor influencing the annual and monthly mean runoff in summer half year, while temperature is the primary factor in winter season.
