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首页> 外文期刊>International Journal of Environmental Impacts: Management, Mitigation and Recovery >UNCERTAINTY IN MINIMUM INSTREAM FLOW REQUIREMENTS FOR STREAMS IN SEMI-ARID ENVIRONMENTS
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UNCERTAINTY IN MINIMUM INSTREAM FLOW REQUIREMENTS FOR STREAMS IN SEMI-ARID ENVIRONMENTS

机译：最低生态基流要求的不确定性流的半干旱环境

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摘要

Increased competition for water resources in arid and semi-arid watersheds is prompting management agencies to adopt instream flow requirements for critical aquatic habitats. For instance, because of increasing concerns for bull trout and salmonid species in the Touchet River system, minimum instream flows are needed to protect several important rearing and spawning reaches. The study included a field reconnaissance of the region with specific emphasis on known migration blockages, spawning and rearing habitat areas, and other areas identified in the project scoping meeting. Eight representative cross sections were selected at each of seven stream segments based on this initial field reconnaissance survey. Care was taken to include pool, spawning, riffle and other unique stream characteristics. Depth and velocity profiles were measured at each of the cross sections at three different water stages: high, medium and low. Substrate grab samples were taken along each of the eight reaches for subsequent analysis. Temperature data along with several other basic water quality parameters (i.e. dissolved oxygen, pH, conductivity and turbidity) and an assessment of vegetative cover were also recorded during sampling. Minimum instream flow modelling and analysis were conducted using the instream flow incremental methodology technique. Habitat suitability indices were assigned to each stream cell. Non-binding recommendations for instream flow values were provided to management agencies. A considerable amount of uncertainty exists in the preference factors assigned to the various life stages of bull trout and salmonid species. Much of this stems from the processes traditionally used to determine factors related to juvenile rearing, spawning and migration. A conclusion of this study was that preference curves developed for wet regions were not applicable to semi-arid river basins where stream flows are often quite small in comparison. This study documents the assumptions, procedures and results of this investigation and demonstrates the potential impacts of uncertainty on the results.
机译：水资源在干旱的竞争加剧和半干旱流域促使管理机构采用生态基流的要求重要的水生栖息地。增加欧鳟和担忧salmonid物种Touchet河系统,最小生态基流需要保护几个重要的饲养和产卵。这项研究包括的实地勘查区域与特定的强调被迁移堵塞、产卵和饲养栖息地,和其他领域中确定项目范围会议。选择在每个七流段的基础在这个初步的实地勘测。被送往包括池、产卵、浅滩和其他独特的流特点。在每个测量速度概要文件横截面水在三个不同的阶段:高、中、低。沿着八个伸手后续的分析。其他几个基本水质参数(即溶解氧、pH、电导率和浊度)和植被的评估也在取样记录。生态基流建模和分析使用生态基流增量进行方法技术。引入指数的概念是分配给每个流细胞。不具约束力的建议生态基流值提供给管理机构。中存在大量的不确定性偏好因素分配到不同的生活阶段的牛鳟鱼和salmonid物种。这源于传统的流程用于确定因素与青少年有关饲养、产卵和迁移。本研究是偏好曲线发展潮湿的地区并不适用于半干旱江河流域,流流往往相当小的比较。假设,过程和结果调查展示了潜力影响结果的不确定性。

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