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中文摘要：
以我国R河为例,运用情景分析和变化范围法RVA,计算了现状开发状态、高级开发状态情景下梯级开发对河流水文情势的改变度,探讨了R河不同梯级开发等级对水文情势的影响。结果表明：随着梯级开发等级的提高,梯级开发对R河水文情势的综合改变度有上升趋势,但不同指标的变化趋势不尽相同;高低流量频率及延时、流量变化改变率及频率指标的综合改变度为高度改变,其他组指标综合改变度为中度改变;综合评估梯级开发对R河天然水文情势的影响为中度改变。
英文摘要：
In this paper ,by taking a sandy river in South China for example and using scenario analysis and the range of variation method （RVA） ,the authors calculated varying degrees of present and advanced cascade development scenarios on river regime ,dis‐cussed the impact of different grades of cascade development on hydrological regime in the R River .The results show that ：with the increasing level of the cascade development ,comprehensive varying degree of cascade development to hydrological regimes has a ris‐ing trend in the R River ,but the tendencies of different indicators are not the same;it is moderate of comprehensive varying degree of cascade development to hydrological regimes .
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