考虑不同水文年及IHA指标相关性的水文特征评估方法

发布时间：2018-08-13 15:31

【摘要】：变动范围法(RVA)是国内外评价河流水文特征变化的重要方法,但其存在忽略水文年变化特征及中低度改变指标的缺陷。针对此问题,采用CRITIC法结合欧氏距离对传统RVA进行改进,并将改进方法用于黄河源区(唐乃亥水文站),分析黄河源区径流量的水文指标变化趋势和整体水文变异程度。研究结果表明:唐乃亥水文站在1990年时水文情势发生突变,突变后流量呈减少趋势;受干扰后的唐乃亥水文站2/3月份平均流量、年最小7/30/90d流量、年最大90d流量、高流量平均延时、流量平均减少率/增加率共9个指标为中度改变,其余指标为低度改变;黄河源区水文特征年改变度为41.36%,水文指标整体改变度为27.33%,水文情势整体改变度为57.39%,属于中度改变。
[Abstract]:The variation range method (RVA) is an important method to evaluate the variation of river hydrological characteristics at home and abroad, but it has the defects of neglecting the annual variation characteristics of hydrology and the index of middle and low degree change. To solve this problem, CRITIC method combined with Euclidean distance is used to improve the traditional RVA, and the improved method is applied to the source area of the Yellow River (Tangnahe Hydrologic Station) to analyze the variation trend of hydrological indexes and the degree of overall hydrological variation of runoff in the source area of the Yellow River. The results show that the hydrological situation of Tangnahe Hydrological Station changed suddenly in 1990, and the flow rate decreased after the sudden change, and the disturbed average discharge of Tangnahe Hydrologic Station in March was 2 / 3, with the minimum annual discharge of 7 / 30 / 90 days and the maximum annual flow rate of 90 days. The average delay of high flow, the average decrease rate / increase rate of traffic are 9 indexes are moderate change, the others are low degree change; The annual change degree of hydrological characteristics in the source area of the Yellow River is 41.36, the whole change degree of hydrological index is 27.33 and the whole change degree of hydrological situation is 57.39, which belongs to moderate change.
【作者单位】：江苏省水文水资源勘测局;河海大学水文水资源学院;
【分类号】：P333

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