灰水足迹是一种基于稀释水需求量提出的新的水质评价方法,为定量描述水质与水量的关系提供了崭新的思路。但在实际流域尺度下灰水足迹的研究中,由于未考虑时间维度的划分,使得灰水足迹的评价结果往往不够准确,掩盖了个别时段水体污染的严重程度。因此,为了准确评价水质,真实反映水质状况,提出基于时间维度的灰水足迹核算与评价方法,即分别核算每年枯水期、平水期和丰水期的灰水足迹和水污染程度,利用水污染程度这一指标分别对每个时间段灰水足迹的可持续性作出评价。结果显示,不同时间维度下核算出的水污染程度值相差较大,且在丰、平、枯水期核算出的水污染程度值与实际情况更相符。较年际水平下灰水足迹的核算与评价方法,本文提出的方法能够更加准确有效地评价灰水足迹的可持续性,反映出水体在各时段的实际污染情况。
Abstract
Grey water footprint, a novel concept for water quality evaluation, offers a new idea for quantitatively describing the relationship between water quality and water quantity. In actual calculation, however, the results are often not accurate enough as the severity of water pollution in some period of time is ignored in no consideration of time dimension. In view of this, a calculation and assessment method for grey water footprint in consideration of time dimension is proposed: the grey water footprint and water pollution level in dry season, normal-flow season and wet season of each year are calculated, respectively; in subsequence, the sustainability of grey water footprint in each time period is evaluated based on water pollution level. Results demonstrate that the water pollution level in different time dimensions vary sharply; in particular, the results in consideration of dry season, normal-flow season and wet season are more consistent with the actual situation. In conclusion, compared with traditional method taking account of interannual grey water footprint, the proposed method in this paper is more accurate and effective in evaluating the sustainability of grey water footprint and in reflecting the actual water pollution in each period.
关键词
灰水足迹 /
时间维度 /
水污染程度 /
水质评价 /
大伙房水库上游
Key words
grey water footprint /
time dimension /
water pollution level /
water quality evaluation /
upstream of Dahuofang reservoir
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基金
辽宁省重大科技计划项目(2012212001)
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