基于RAV法的水利工程对河流水文情势改变的累积效应研究——以东江流域为例

Research on Accumulated Effect of Hydraulic Structures on River Regime Alteration Based on RAV Method: A Case Study of Dongjiang River Basin

以珠江水系典型流域—东江流域为例,通过IHA和RAV法分析东江水文情势变化情况,计算了不同水利工程开发程度对河流水文情势的改变度,探讨了河流水文情势随水利工程的开发程度提高所产生的变化趋势和累积效应。研究结果表明,水利工程开发等级的提高对东江水文情势影响程度的累积效应逐渐削弱,具体表现为随着东江流域三大水库和各梯级的陆续建成,东江水利工程对下游博罗站的水文情势综合改变度逐渐降低,但对流量变化的频率、改变率的影响逐渐增大,对高低流量延时、次数方面的影响不明显。

With the Dongjiang River Basin as a case study, we analyzed and calculated the river regime alteration at different levels of hydraulic structure development, and discussed the accumulated effect of the hydraulic structures, by using RAV and IHA methods. The results show that the accumulated effect on the hydrological regime of the Dongjiang River has weakened, the effect on flow change frequency gradually increase, and there is no influence on delay of high/ low flow and the concerned frequency.