Hydraulic modelling for assessment of the performance of sedimentation basins downstream from extracted peatlands.

IF 1.5 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Mires and Peat Pub Date : 2020-01-01 DOI:10.19189/MAP.2019.JSP.STA.1789

S. Hafdhi, S. Duchesne, A. St‐Hilaire

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引用次数: 0

Abstract

Three sedimentation basins on two different extracted peatlands were studied to determine their Trapping Efficiency (TE) using two different methods. First, TE was calculated using sediment loads estimated from turbidity measurements upstream and downstream of the basins. The second method was based on hydraulic modelling and a simplified sediment deposition model. For the first studied basin (controlled by a weir at its downstream end) TE was estimated with the second method at 85.9 % and 55.6 % for lower and higher flows, respectively. In the second peatland the studied basins were in series, there was a geotextile curtain in the middle of each basin and a weir or a double pipe culvert at the outlet. For these two basins in series, TE was estimated at 80 % for lower flows and at 34.3 % for higher flows. A hydraulic model was calibrated for the studied basins and applied to estimate the TE of different basin configurations. The results show that the role of the geotextile curtain is important in the case of short basins and for intense rainfall events. The double pipe culvert did not have a significant effect on TE, unlike the presence of a weir at the outlet, which is required to maintain high TE.

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用于评估开采泥炭地下游沉积盆地性能的水力模型。

以两种不同提取泥炭地上的3个沉积盆地为研究对象，采用两种不同的方法确定其捕集效率。首先，TE是通过对流域上游和下游浊度测量估计的泥沙负荷来计算的。第二种方法是基于水力建模和简化的泥沙沉积模型。对于第一个研究的流域(由下游末端的堰控制)，用第二种方法估计，在低流量和高流量下，TE分别为85.9%和55.6%。在第二泥炭地，研究的盆地呈串联，每个盆地中间有土工布帷幕，出水口有堰或双管涵洞。对于这两个系列盆地，低流量的TE估计为80%，高流量的TE估计为34.3%。对研究流域的水力模型进行了校正，并应用于估算不同流域配置的TE。结果表明，在短流域和强降雨事件中，土工布帷幕的作用是重要的。双管涵洞对TE没有显著影响，不像在出口处存在堰，这需要保持高TE。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mires and Peat ENVIRONMENTAL SCIENCES-

CiteScore

2.30

自引率

16.70%

发文量

审稿时长

33 weeks

期刊介绍： Mires and Peat is a peer-reviewed internet journal focusing specifically on mires, peatlands and peat. As a truly “free-to-users” publication (i.e. NO CHARGES to authors OR readers), it is immediately accessible to readers and potential authors worldwide. It is published jointly by the International Peatland Society (IPS) and the International Mire Conservation Group (IMCG). Mires and Peat is indexed by Thomson Reuters Web of Science (2017 Impact Factors: 1.326 [two-year] and 1.638 [five-year]), Elsevier Scopus, EBSCO Environment Complete, CABI Abstracts, CSA Proquest (including their Aquatic Science and Fisheries Abstracts ASFA, Ecology, Entomology, Animal Behavior, Aqualine and Pollution databases) and Directory of Open Access Journals (DOAJ). Mires and Peat also participates in the CABI Full Text Repository, and subscribes to the Portico E-journal Preservation Service (LTPA). Mires and Peat publishes high-quality research papers on all aspects of peatland science, technology and wise use, including: ecology, hydrology, survey, inventory, classification, functions and values of mires and peatlands; scientific, economic and human aspects of the management of peatlands for agriculture, forestry, nature conservation, environmental protection, peat extraction, industrial development and other purposes; biological, physical and chemical characteristics of peat; and climate change and peatlands. Short communications and review articles on these and related topics will also be considered; and suggestions for special issues of the Journal based on the proceedings of conferences, seminars, symposia and workshops will be welcomed. The submission of material by authors and from countries whose work would otherwise be inaccessible to the international community is particularly encouraged.