水电科技

闸坝对沙颖河自然水文情势的影响研究

李志, 葛金金

摘要


在河流水文过程中，流量量级、历时、出现时间、频率及变化率等特征要素是河流水生生物生存及其多样性发生改变的关键因素。为维持干流全部河段水生态健康，在时空尺度内对多站点代表的河流水文情势变动特征进行识别，已成为目前河流水文过程影响精细化研究的新趋势。文章以沙颍河研究区域，基于WEP水文模型还原的自然流量过程数据，采用IHA法和RVA法，识别了沙颍河干流在建闸前后水文指标变动规律，并提出了生态流量调度相关建议。结果表明：①在闸坝建设后，沙颍河干流高度改变的IHA指标数量在上游最多，中游最少；②沙颍河干流的IHA整体改变度变化趋势：为上游高度变化，中、下游中度变化；③表征低流量状态的IHA指标改变度在干流各断面均处于较高变化水平，生态流量调度中需要综合考虑低流量指标改变度的削减。

关键词


沙颍河；流域干流；闸坝影响；水文情势变化；河流生态

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参考


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DOI: https://doi.org/10.33142/hst.v4i5.4654

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