Balancing water reuse and ecological support goals in an effluent dominated river

IF 3.1 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Jordyn M. Wolfand , Kristine T. Taniguchi-Quan , Reza Abdi , Elizabeth Gallo , Katie Irving , Daniel Philippus , Jennifer B. Rogers , Eric D. Stein , Terri S. Hogue
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引用次数: 6

Abstract

Flows in urban rivers are increasingly managed to support water supply needs while also protecting and/or restoring instream ecological functions, goals that are often in opposition to each other. Effluent-dominated rivers (i.e., rivers that consist primarily of discharged treated wastewater) pose a particular challenge because changes in effluent discharge may impact river ecology. A functional flows approach, in which metrics from the annual hydrograph correspond to ecological processes, was applied to understand the hydro-ecological implications of wastewater reuse in the Los Angeles River watershed (Los Angeles County, California, USA). The Los Angeles River, like many urban rivers, is dominated by effluent, particularly during dry weather. An hourly hydrologic model was created, calibrated, and validated in EPA SWMM for the Los Angeles River watershed to investigate how increases in wastewater reuse (i.e., decreases in discharge to the river) may impact river flows and subsequently ecology and recreation in the river. Current flows are shown to support freshwater marsh, riparian habitat, fish migration, and wading shorebird habitat, in addition to recreational kayaking. Functional flow metrics were assessed under future management scenarios including reducing discharge to increase recycling at three wastewater treatment plants within the watershed. Both wet-season and dry-season baseflows were most sensitive to increasing wastewater reuse, with an average decrease of 51–56% (0.93 cms) from current baseflows. Sensitivity curves that relate potential changes in wastewater discharge to changes in functional flows show that a 4% decrease in current wastewater discharge may negatively impact habitat for indicator species during the dry season. More opportunity exists for wastewater reuse during the wet season, when current wastewater discharge may be reduced by 24% with minimal impacts to ecology and recreation. The developed approach has the potential to inform similar tradeoff decisions in other urban rivers where flows are dominated by wastewater or stormdrain discharge.

Abstract Image

在一条以污水为主的河流中平衡水的再利用和生态支持目标
越来越多地管理城市河流的流量,以满足供水需求,同时也保护和/或恢复河流的生态功能,这两个目标往往是相互矛盾的。污水为主的河流(即主要由排放的处理过的废水组成的河流)构成了一个特别的挑战,因为污水排放的变化可能影响河流生态。一种功能流方法,其中来自年度水文曲线的指标对应于生态过程,被应用于了解洛杉矶河流域(美国加利福尼亚州洛杉矶县)废水再利用的水文生态影响。洛杉矶河,像许多城市河流一样,主要是污水,特别是在干燥的天气。在EPA SWMM中为洛杉矶河流域创建、校准和验证了每小时的水文模型,以调查废水回用的增加(即向河流排放的减少)如何影响河流流量以及随后的河流生态和娱乐。除休闲皮划艇外,水流还支持淡水沼泽、河岸栖息地、鱼类迁徙和涉水滨鸟栖息地。在未来的管理方案下评估了功能流量指标,包括在流域内的三个污水处理厂减少排放以增加循环利用。干湿季基流对污水回用的增加最为敏感,平均比当前基流减少51-56% (0.93 cm)。将废水排放的潜在变化与功能流量变化联系起来的敏感性曲线表明,当前废水排放量减少4%可能会对指示物种的栖息地产生负面影响。在雨季,废水回用的机会更多,目前的废水排放量可减少24%,对生态和娱乐的影响最小。开发的方法有可能为其他城市河流提供类似的权衡决策,这些河流的流量主要是废水或雨水排放。
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来源期刊
Journal of Hydrology X
Journal of Hydrology X Environmental Science-Water Science and Technology
CiteScore
7.00
自引率
2.50%
发文量
20
审稿时长
25 weeks
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