Hydro-modeling the ecosystem impact of wastewater reuse under climate change: A case study in upper Red River basin, Oklahoma

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Shang Gao, Zhi Li, Grant Graves, Hannah A. Mattes, Shadi Fathollahifard, Jason Vogel, Thomas M. Neeson, Keith Strevett, Yang Hong
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Abstract

Water reuse, as a viable option for water supply, must be implemented to minimize the adverse impacts on stream ecosystems that previously received this wastewater effluent. In the State of Oklahoma (OK), USA, local communities have implemented wastewater reuse, and many seek to expand the reuse programs. This study presents a hydro-modeling analysis based on the Coupled Routing and Excess STorage with VECtor routing (CREST-VEC) model focusing on the potential ecosystem impacts and societal benefits of wastewater reuse under climate change in the OK portion of the Red River basin. First, a CREST-VEC model is established for the upper Red River basin and validated against observed streamflow for a 30-year historical period (1990–2020). Based on the established model, we then assess the sensitivity of ecosystem impact to various climate change scenarios and hypothetical wastewater reuse scenarios. Results show that dominant effects of climate change cause the annual time below environmental flow to increase in the next 30 years, which constrains the room to implement wastewater reuse. However, at sub-catchment scale, the analyses identify viable locations for allocating wastewater reuse while maintaining ecosystem health. The results also reveal that wastewater reuse brings about the most societal water benefits at minimal cost of ecosystem health under representative concentration pathway (RCP) 2.6 followed by RCP 4.5 and then RCP 8.5. Overall, the study demonstrates capabilities of the hydro-modeling framework in developing water management plans facing the changing climate.

气候变化条件下废水回用对生态系统影响的水文模拟:俄克拉荷马州红河上游流域案例研究
中水回用作为一种可行的供水选择,必须将其对之前接受废水排放的溪流生态系统的不利影响降至最低。在美国俄克拉荷马州(OK),当地社区已经实施了废水回用,许多社区还在寻求扩大回用计划。本研究基于 VECtor 路由耦合路由和过量贮存(CREST-VEC)模型进行了水文模型分析,重点研究了红河流域俄克拉荷马州部分地区在气候变化条件下废水回用对生态系统的潜在影响和社会效益。首先,我们为红河上游流域建立了 CREST-VEC 模型,并根据 30 年历史时期(1990-2020 年)的观测流量进行了验证。然后,根据建立的模型,我们评估了生态系统对各种气候变化情景和假设的废水再利用情景的敏感性。结果表明,气候变化的主要影响会导致未来 30 年每年低于环境流量的时间增加,从而限制了实施污水回用的空间。然而,在小流域范围内,分析确定了在保持生态系统健康的前提下分配废水回用的可行地点。结果还显示,在代表性浓度路径 (RCP) 2.6 下,废水回用以最小的生态系统健康代价带来了最大的社会用水效益,其次是 RCP 4.5,然后是 RCP 8.5。总之,这项研究展示了水文模型框架在制定面临气候变化的水资源管理计划方面的能力。
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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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