利用流域尺度的分布式水文模型评估大坝和气候变化引起的环境流量变化

Haruki Mineda, Kei Nukazawa, Yoshihiro Suzuki
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Here, we aimed to evaluate and compare the hydrological alterations caused by dams and climate change throughout the Omaru River catchment, Japan, using a distributed hydrological model (DHM). First, to assess the impacts of dam and climate change independently, we performed runoff analyses using either dam discharge or future climatic data (two future periods, 2031–2050 and 2081–2100 × three representative concentration pathways). Subsequently, we derived indicators of hydrologic alterations (IHA) to quantify changes in flow alterations by comparing them to IHA under natural conditions (i.e., without dam or climate change data). We found that dams altered IHAs more than climate change. However, on a catchment-scale standpoint, climate change induced wider ranges of flow alterations, such as a further decrease in low flow metrics along the tributaries and uppermost main stem, suggesting a catchment-level shrinkage in important corridors of aquatic organisms. We also observed that the altered flow by water withdrawals was ameliorated by the confluence of tributaries and downstream hydropower outflows. Our approach using a DHM captured the various patterns of flow alterations by dams and climate change.</p>","PeriodicalId":510893,"journal":{"name":"Journal of Water & Climate Change","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assessing environmental flow alterations induced by dams and climate change using a distributed hydrological model at catchment scale\",\"authors\":\"Haruki Mineda, Kei Nukazawa, Yoshihiro Suzuki\",\"doi\":\"10.2166/wcc.2023.538\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div data- reveal-group-><div><img alt=\\\"graphic\\\" data-src=\\\"https://iwa.silverchair-cdn.com/iwa/content_public/journal/jwcc/14/12/10.2166_wcc.2023.538/1/m_jwc-d-23-00438gf01.png?Expires=1706939278&amp;Signature=B7LG5g2CORUudGWZZSlldAcED~IZX6EatrUE70uC2dUnkEIlx8KjAsd0ZpnmYlnv99vwjZDYnK1hZ8OOfQ5rRwAh4vdL6Ugm0iQZ783YXFzWKvwc7Os2TYJrCaXoYRm4pI42OzU99k37k3T4foTqWW4c~~aVO-HpIuPnbOHcEsZdHevNCe-wWW~Ulm51~dNX9Uy59NPHxVuVD9mV69r~5vGiHHqLw2fckyIAWt5nGcfo6i2OkFk6LzVyoXyv3uF8IiEyiXFUdZTLYIxPckzNhXjCdhmC51E07TiQOiWu-b0EjeAfwHx6VF1gJ0d-r0vmwJkiRo7icF1JtOOiAPq3Og__&amp;Key-Pair-Id=APKAIE5G5CRDK6RD3PGA\\\" path-from-xml=\\\"jwc-d-23-00438gf01.tif\\\" src=\\\"https://iwa.silverchair-cdn.com/iwa/content_public/journal/jwcc/14/12/10.2166_wcc.2023.538/1/m_jwc-d-23-00438gf01.png?Expires=1706939278&amp;Signature=B7LG5g2CORUudGWZZSlldAcED~IZX6EatrUE70uC2dUnkEIlx8KjAsd0ZpnmYlnv99vwjZDYnK1hZ8OOfQ5rRwAh4vdL6Ugm0iQZ783YXFzWKvwc7Os2TYJrCaXoYRm4pI42OzU99k37k3T4foTqWW4c~~aVO-HpIuPnbOHcEsZdHevNCe-wWW~Ulm51~dNX9Uy59NPHxVuVD9mV69r~5vGiHHqLw2fckyIAWt5nGcfo6i2OkFk6LzVyoXyv3uF8IiEyiXFUdZTLYIxPckzNhXjCdhmC51E07TiQOiWu-b0EjeAfwHx6VF1gJ0d-r0vmwJkiRo7icF1JtOOiAPq3Og__&amp;Key-Pair-Id=APKAIE5G5CRDK6RD3PGA\\\"/><div>View largeDownload slide</div></div></div><div content- data-reveal=\\\"data-reveal\\\"><div><img alt=\\\"graphic\\\" data-src=\\\"https://iwa.silverchair-cdn.com/iwa/content_public/journal/jwcc/14/12/10.2166_wcc.2023.538/1/m_jwc-d-23-00438gf01.png?Expires=1706939278&amp;Signature=B7LG5g2CORUudGWZZSlldAcED~IZX6EatrUE70uC2dUnkEIlx8KjAsd0ZpnmYlnv99vwjZDYnK1hZ8OOfQ5rRwAh4vdL6Ugm0iQZ783YXFzWKvwc7Os2TYJrCaXoYRm4pI42OzU99k37k3T4foTqWW4c~~aVO-HpIuPnbOHcEsZdHevNCe-wWW~Ulm51~dNX9Uy59NPHxVuVD9mV69r~5vGiHHqLw2fckyIAWt5nGcfo6i2OkFk6LzVyoXyv3uF8IiEyiXFUdZTLYIxPckzNhXjCdhmC51E07TiQOiWu-b0EjeAfwHx6VF1gJ0d-r0vmwJkiRo7icF1JtOOiAPq3Og__&amp;Key-Pair-Id=APKAIE5G5CRDK6RD3PGA\\\" path-from-xml=\\\"jwc-d-23-00438gf01.tif\\\" src=\\\"https://iwa.silverchair-cdn.com/iwa/content_public/journal/jwcc/14/12/10.2166_wcc.2023.538/1/m_jwc-d-23-00438gf01.png?Expires=1706939278&amp;Signature=B7LG5g2CORUudGWZZSlldAcED~IZX6EatrUE70uC2dUnkEIlx8KjAsd0ZpnmYlnv99vwjZDYnK1hZ8OOfQ5rRwAh4vdL6Ugm0iQZ783YXFzWKvwc7Os2TYJrCaXoYRm4pI42OzU99k37k3T4foTqWW4c~~aVO-HpIuPnbOHcEsZdHevNCe-wWW~Ulm51~dNX9Uy59NPHxVuVD9mV69r~5vGiHHqLw2fckyIAWt5nGcfo6i2OkFk6LzVyoXyv3uF8IiEyiXFUdZTLYIxPckzNhXjCdhmC51E07TiQOiWu-b0EjeAfwHx6VF1gJ0d-r0vmwJkiRo7icF1JtOOiAPq3Og__&amp;Key-Pair-Id=APKAIE5G5CRDK6RD3PGA\\\"/><div>View largeDownload slide</div></div><i> </i><span>Close modal</span></div></div><p>Hydrological alterations by dams and climate change can reduce aquatic biodiversity by disrupting the life cycles of organisms. 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引用次数: 0

摘要

View largeDownload slideView largeDownload slide Close modal水坝和气候变化造成的水文变化会扰乱生物的生命周期,从而减少水生生物的多样性。在此,我们利用分布式水文模型(DHM)评估和比较了大坝和气候变化对日本奥丸川流域造成的水文变化。首先,为了独立评估大坝和气候变化的影响,我们使用大坝排水量或未来气候数据(2031-2050 年和 2081-2100 年两个未来时期 × 三个代表性浓度途径)进行了径流分析。随后,我们得出了水文变化指标(IHA),通过与自然条件下(即没有大坝或气候变化数据的情况下)的 IHA 进行比较,量化流量变化的变化。我们发现,大坝对 IHA 的改变比气候变化更大。然而,从流域尺度的角度来看,气候变化引起的流量变化范围更广,例如支流和最上游干流的低流量指标进一步下降,这表明水生生物重要走廊的流域尺度缩小了。我们还观察到,支流与下游水电外流的汇合改善了取水造成的流量变化。我们使用 DHM 的方法捕捉到了大坝和气候变化对流量改变的各种模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing environmental flow alterations induced by dams and climate change using a distributed hydrological model at catchment scale
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Hydrological alterations by dams and climate change can reduce aquatic biodiversity by disrupting the life cycles of organisms. Here, we aimed to evaluate and compare the hydrological alterations caused by dams and climate change throughout the Omaru River catchment, Japan, using a distributed hydrological model (DHM). First, to assess the impacts of dam and climate change independently, we performed runoff analyses using either dam discharge or future climatic data (two future periods, 2031–2050 and 2081–2100 × three representative concentration pathways). Subsequently, we derived indicators of hydrologic alterations (IHA) to quantify changes in flow alterations by comparing them to IHA under natural conditions (i.e., without dam or climate change data). We found that dams altered IHAs more than climate change. However, on a catchment-scale standpoint, climate change induced wider ranges of flow alterations, such as a further decrease in low flow metrics along the tributaries and uppermost main stem, suggesting a catchment-level shrinkage in important corridors of aquatic organisms. We also observed that the altered flow by water withdrawals was ameliorated by the confluence of tributaries and downstream hydropower outflows. Our approach using a DHM captured the various patterns of flow alterations by dams and climate change.

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