日本地球惑星科学連合2023年大会

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[E] 口頭発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW19] 水循環・水環境

2023年5月24日(水) 10:45 〜 12:00 105 (幕張メッセ国際会議場)

コンビーナ:榊原 厚一(信州大学理学部理学科)、岩上 翔(国立研究開発法人 森林研究・整備機構 森林総合研究所)、林 武司(秋田大学教育文化学部)、福士 圭介(金沢大学環日本海域環境研究センター)、座長:飯田 真一(国立研究開発法人森林研究・整備機構森林総合研究所森林研究部門森林防災研究領域水保全研究室)、榊原 厚一(信州大学理学部理学科)、岩上 翔(国立研究開発法人 森林研究・整備機構 森林総合研究所)、林 武司(秋田大学教育文化学部)、福士 圭介(金沢大学環日本海域環境研究センター)

11:45 〜 12:00

[AHW19-10] Is Wastewater Reuse a Sustainable Solution to Meet Increasing Water Demands Under Climate Change? A Case Study based on Vectorized Hydro-modeling in Red River Basin

Shang Gao1、*Zhi Li1、Grant Graves1、Jason Vogel1、Tom Neeson1、Keith Strevett1、Yang Hong1 (1.University of Oklahoma)

キーワード:hydrologic modeling, wastewater reuse, climate change

Wastewater reuse is potentially a viable option for mitigating the impacts of climate change and increased water demands on available water supplies. However, water reuse must be implemented in such to minimize the negative impacts on streams, ecosystems, and downstream water users that previously received this wastewater effluent. This study develops a comprehensive assessment of the potential environmental impacts and societal benefits of wastewater reuse in the Red River basin. A coupled riverflow modeling framework (CREST-SWAT) is developed in attempts to integrate water quality and quantity simulation to assist water management at large spatial scales. A historical (1990 to 2020) simulation is first evaluated against observed streamflow to ensure the model’s capability in capturing the hydro-climatology in the study watershed. Ensemble future simulations are then assessed regarding the change in ‘time below the environmental flow’ (Qenv, defined as 30th percentile of historical streamflow) under various emission scenarios and wastewater reduction rates. The results show that climate change’s dominant effects in causing longer time below Qenv than in the historical simulation for all test cases. However, a close examination of individual reaches/catchments shows the room to balance the impacts of climate change and water supplies locally. Based on the allocated water rights, the benefit from wastewater recycling is further categorized in terms of usage, e.g., public water, irrigation, power, etc. Overall, the study demonstrates utility of the integrated modeling framework in developing water management plans facing the changing climate.