کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8061306 1520512 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A scenario-based approach to evaluating potential environmental impacts following a tidal barrage installation
ترجمه فارسی عنوان
یک رویکرد مبتنی بر سناریوی برای ارزیابی اثرات احتمالی زیست محیطی پس از نصب و راه اندازی زهکش جزر و مد
کلمات کلیدی
کل مانع خروج، رطوبت، منشور جزر و مد بیتومتری، گونه های مهاجر، مرفولوژی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی
Total exclusion barrages have a high impact on estuarine systems as they are permanent barriers to tidal flow. The environmental impacts of five putative barrages in various locations within the Tamar River estuary in northern Tasmania, Australia were assessed by considering likely hydrological, morphological and ecological outcomes. We found that all hypothetical barrages would produce downstream silt accretion, some to the point where a major port would become unusable without ongoing dredging. The closer a barrage was located to the mouth of the estuary, the greater the loss of tidal prism, the lower the effect of flushing by floodwaters, and the greater the loss of estuarine biodiversity. Eradication of invasive rice grass (Spartina anglica) in the mid estuary is potentially a positive outcome, whilst constant headpond surface heights could cause bank erosion and subsidence. Loss of tidal wetlands would contravene the international treaties protecting the migratory waterbirds which use these habitats. Installation of a barrage at the uppermost location appears to represent the best trade-off between adverse impacts and increased recreational and visual amenity. Unfortunately, barrage installation at any site within the estuary fails to address the major anthropogenic stressors of reduced riverine inflows and tidal flushing. A wider sustainability analysis is needed in which the costs of meeting environmental, social and economic objectives are considered.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean & Coastal Management - Volume 116, November 2015, Pages 9-19
نویسندگان
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