DOWNSTREAM ENVIRONMENTAL EFFECTS OF DAM OPERATIONS: CHANGES IN HABITAT QUALITY FOR NATIVE FISH SPECIES
DOWNSTREAM ENVIRONMENTAL EFFECTS OF DAM OPERATIONS: CHANGES IN HABITAT QUALITY FOR NATIVE FISH SPECIES
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DOI：
10.1002/rra.1358
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发表时间：
2011-03-01
影响因子：
2.2
通讯作者：
Parra, Oscar
中科院分区：
文献类型：
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作者：
Garcia, Alex;Jorde, Klaus;Parra, Oscar
水力调峰大坝的运行和抽水灌溉被广泛认为是对自然水流状态的改变，自1996年以来，在智利中部的比奥比奥流域也注意到了这一点。在比奥比奥河，大多数本地鱼类是特有的，对它们知之甚少。它们的生态和社会价值从未被估计过，也缺乏关于它们栖息地偏好的信息。此外，由于自然和/或人为原因造成的鱼类栖息地的变化也没有得到评估。在这项研究中，8种本地鱼类，在比奥比奥河的一个代表性的河段，进行了研究，他们的首选栖息地进行了调查和特点。建立了水动力学模型，并将其与鱼类栖息地模拟模型CASiMiR相连接。模糊规则和模糊集被开发用于描述本地鱼类的栖息地偏好。CASiMiR然后被用来模拟物理栖息地条件如何变化，由于流量控制（即上游水坝）。结果表明，如何整体栖息地质量，表示为加权可用面积（WUA）和水力栖息地适宜性（HHS），变化和波动，由于大坝的运作，以及如何每日水力调峰是影响数量，质量和位置不同的栖息地。这项研究表明，分析的鱼类是非常容易受到流量控制，大坝目前的运作，鱼类栖息地的改善建议。版权所有（C）2010约翰威利父子有限公司
Hydropeaking dam operation and water extractions for irrigation have been broadly stated as alterations to natural flow regimes, which have also been noticed in the Biobio Watershed, in Central Chile, since 1996. In the Biobio River, most of native fish species are endemic and very little is known about them. Their ecological and social values have never been estimated, and there is lack of information about their habitat preferences. Furthermore, changes on fish habitat availability due to natural and/or man-made causes have not been evaluated. In this study, eight native fish species, in a representative reach of the Biobio River, were studied and their preferred habitats were surveyed and characterized. A hydrodynamic model was built and linked to the fish habitat simulation model CASiMiR. Fuzzy rules and fuzzy sets were developed for describing habitat preference of the native fish species. CASiMiR was then used to simulate how physical habitat conditions vary due to flow control (i.e. upstream dams). Results show how overall habitat quality, expressed as weighted usable area (WUA) and hydraulic habitat suitability (HHS), changes and fluctuates due to the dam operation and how the daily hydropeaking is influencing quantity, quality and location of different habitats. The study suggests that the analysed fish are highly susceptible to flow control, as dams are currently operated, and fish habitat improvement suggestions are proposed. Copyright (C) 2010 John Wiley & Sons, Ltd.