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地理学报  2006 

基于二元水循环的河流生态需水水量与水质综合评价方法——以辽河流域为例

DOI: 10.11821/xb200611002, PP. 1132-1140

Keywords: 二元水循环,生态需水,水量,水质,辽河

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Abstract:

通过考虑水的自然循环与水在人类活动影响下的循环(二元水循环),后者包括水资源开发利用率、耗水率、污水排放浓度影响,探讨了二元水循环下河流生态需水“质”与“量”的综合评价,以区别以往仅从自然水循环(一元)出发评价河流生态需水的缺陷。建立了二元水循环下的河流生态需水的水量与水质计算方法,并确定了河流生态需水的“质”与“量”的评价标准,实现了河流生态需水水量与水质的综合评价。以辽河流域为例进行实证分析,计算了一元水循环下西辽河、东辽河、辽河干流、浑太河、东北沿黄渤海诸河等水资源分区的河流生态需水,分别占径流的39.3%、63.0%、43.9%、43.3%、43.5%,采用Tennant推荐流量及等级进行评价,结果是除西辽河属于“中”等级外,东辽河、浑太河、辽河干流、东北沿黄诸河等均在“好”等级以上,东辽河达到“极好”等级。与之对应的二元水循环下的河流生态需水比例分别是57.5%、74.1%、60.8%、60.3%、60.4%,综合评价结果显示从水量角度评价,西辽河不能达到生态需水“量”的标准,其余能够达标,从水质角度评价,西辽河、浑太河、辽河干流、东北沿黄诸河等均不能够达到“质”的标准,东辽河可以达标。从“量”与“质”相结合的角度评价,仅有东辽河可以达标。因此,水质状况是决定辽河流域河流生态需水是否满足生态系统需求的主要问题。

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