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Large dam renewals and removals—Part 1: Building a science framework to support a decision‐making process
River Research and Applications ( IF 2.2 ) Pub Date : 2020-08-04 , DOI: 10.1002/rra.3680
R. Allen Curry 1, 2 , Gordon Yamazaki 1 , Tommi Linnansaari 1, 2 , Wendy Monk 3 , Kurt M. Samways 1 , Rebecca Dolson 1 , Kelly R. Munkittrick 4 , Anthony Bielecki 5
Affiliation  

Altered rivers and managed flows are a hallmark of civilization and dams are a principal agent of alteration. Peak dam construction occurred at the turn of the last century in Western countries, and many of the largest dams are reaching the end of their service life. As a result, dam operators are increasingly facing a complex renewal/removal decision‐making process in a large part because the economic and social values of dams have changed. The Mactaquac Hydroelectric Generating Station (New Brunswick, Canada), operated by NB Power Corporation (NB Power), is Canada's 25th largest dam and it is reaching the end of its service life. A decision is required for the dam's future state and three options were originally proposed: renew, rebuild, or remove. An overarching science framework was developed with NB Power to inform and support decision‐making for the dam's decision process and an impending Environmental Impact Assessment. The framework guides research and monitoring for dam renewal/removal using science‐based solutions that aim to minimize impacts on the aquatic environment while supporting an efficient and cost‐effective decision‐making process. The framework has five components: (a) establish long‐term baselines of environmental conditions; (b) develop normal ranges describing the river's natural variability; (c) integrated physical and biological modelling; (d) assess the specific and cumulative state of fish passage; and (e) create and sustain a user‐friendly geospatial data management system. In this paper we present a case study that implements the science framework (Part 1) through the Mactaquac Aquatic Ecosystem Study (MAES) with a view to revisit and assess its final impact post‐project completion (Part 2).

中文翻译:

大型水坝更新和拆除—第1部分:建立科学框架以支持决策过程

河流和流量的变化是文明的标志,水坝是变化的主要推动力。西方国家在上世纪初就开始建设水坝高峰期,许多大型水坝的使用寿命已尽。结果,大坝经营者正日益面临着复杂的更新/拆除决策过程,这在很大程度上是由于大坝的经济和社会价值发生了变化。由NB电力公司(NB Power)运营的Mactaquac水力发电站(加拿大新不伦瑞克省)是加拿大的第25大坝,使用寿命已到。大坝的未来状态需要做出决定,最初提出了三种选择:更新,重建或拆除。与NB Power合作开发了一个总体科学框架,为大坝的决策过程和即将进行的环境影响评估提供信息并支持决策。该框架使用基于科学的解决方案指导对大坝更新/拆除的研究和监测,旨在最大程度地减少对水生环境的影响,同时支持高效且具有成本效益的决策过程。该框架包括五个部分:(a)建立环境条件的长期基准;(b)建立描述河流自然变化的正常范围;(c)综合的物理和生物建模;(d)评估鱼类通过的具体和累积状态;(e)创建并维护一个用户友好的地理空间数据管理系统。
更新日期:2020-10-11
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