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衢江衢州段为典型的山溪性河流,其径流易受降雨影响而剧烈波动,为计算其生态径流,基于1956~2006年衢江衢州段逐日流量资料,利用Mann-Kendall法逐月对径流数据进行突变诊断。选取突变前序列,运用15种偏态分布函数逐月拟合日径流资料,综合三种拟合优度检验法的结果,选取最佳拟合函数,取最佳拟合函数概率密度最大处的径流为概率密度法的生态径流,再结合水文变异指标法及变化范围法(RVA/IHA)框架下的生态径流结果,取二者较大值为最终的生态径流过程,并与最枯月频率法和逐月频率法的计算结果比较,引入生态径流满足率评价各计算方法的优劣。结果表明,逐月频率法掩盖了日径流的剧烈波动,应用于山溪性小型河流的生态径流计算不甚合理,概率密度法结合RVA/IHA法的生态径流计算方法较合理。研究结果可为其他山溪性小型河流的生态径流计算提供参考。
Based on the daily flow data of Quzhou section of Qujiang from 1956 to 2006, Quzhou section of Qujiang section of Qujiang section is a typical mountain stream. The runoff is prone to fluctuate violently under the influence of rainfall. Based on Mann-Kendall method, Data for mutation diagnosis. The pre-mutation sequence was selected. Fifteen kinds of skewed distribution function were used to fit monthly runoff data monthly. Based on the results of the three goodness-of-fit tests, the best fit function was selected and the best fit function’s maximum probability density The runoff is the ecological runoff based on the probability density method. Combined with the index of hydrological variation and the result of runoff under the framework of the change range method (RVA / IHA), the larger runoff is taken as the final runoff, Compared with the results calculated by the monthly frequency method, the ecological runoff satisfaction rate is introduced to evaluate the advantages and disadvantages of each calculation method. The results show that the monthly frequency method masks the violent fluctuation of daily runoff. The calculation of ecological runoff applied to small streams in mountain streams is not reasonable, and the calculation method of ecological runoff combined with probability density method and RVA / IHA method is reasonable. The results can provide reference for the eco-runoff calculation of other mountain streams.