基于IHA-RVA法的资水流域水文情势评估

Hydrological Regime Assessment of Zishui Basin Based on IHA-RVA Method

为了研究资水流域水文情势的变化,选取桃江水文站1959—2016年的逐日流量数据为研究资料,采用Mann-Kendall检验法、累积距平法和滑动T检验法进行流量特征分析,并应用生态水文指标变化范围法(IHA-RVA)以及水文改变度法综合评价了资水流域的水文情势改变程度。结果表明:资水流域桃江水文站的年均流量呈略微上升趋势,突变年份出现在1987年。通过对资水流域水文突变前后桃江水文站水文指标的分析可知:资水流域整体的水文改变度为22%,仅达到低度改变;32个IHA水文指标中,年最小值流量出现时间受影响最大。该研究可为资水流域生态水文情势的健康、可持续发展提供基础参考。

In order to study the changes of hydrological regime in Zishui River basin,the daily flow data of the Taojiang hydrological station (1959-2016) were selected,and the flow characteristics were analyzed by Mann-Kendall method,cumulative anomaly method and sliding T test,as well as the water resources change range method (IHA-RVA) and the method of degree of hydrologic alteration were used to evaluate the degree of changes in the hydrological regime of the Zishui River basin. The results show that the average annual flow of the Taojiang hydrological station in the Zishui River hydrological control station is flat,and the change trend is not obvious. The mutation year appears in 1987. Through the analysis of 32 hydrological indicators of the Taojiang hydrological station before and after the hydrological mutation in Zishui basin,the degree of overall changes of Taojiang hydrological station is 22%,only reaching the low degree of changes,of which the occurrence time of the annual minimum is strongly affected. This study can provide a basic reference for the healthy and sustainable development of hydrological regime in Zishui basin.