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Winter and summer differences in probability of fish encounter (spatial overlap) with MHK devices 冬季和夏季鱼类与MHK设备相遇概率（空间重叠）的差异

International Marine Energy Journal Pub Date : 2018-08-30 DOI: 10.36688/IMEJ.1.9-18

H. Viehman, T. Boucher, A. Redden

{"title":"Winter and summer differences in probability of fish encounter (spatial overlap) with MHK devices","authors":"H. Viehman, T. Boucher, A. Redden","doi":"10.36688/IMEJ.1.9-18","DOIUrl":"https://doi.org/10.36688/IMEJ.1.9-18","url":null,"abstract":"The likelihood of fish encountering an MHK device, and therefore the risk posed to fish, depends largely on the natural distribution of fish at tidal energy development sites. In temperate locations, such as the Bay of Fundy, seasonal changes in the environment and fish assemblage may alter the likelihood of fish encounters with MHK devices. We examined two one-month hydroacoustic datasets collected in winter 2015 and summer 2016 by an upward-facing echosounder deployed at the Fundy Ocean Research Center for Energy test site in the Minas Passage. Fish density was higher and less variable in winter than in summer, likely due to the presence of migratory vs. overwintering fish. The vertical distribution of fish varied with sample period, diel stage, and tidal stage. The proportion of fish at MHK device depth was greater, but more variable, in summer than in winter. Encounter probability, or potential for spatial overlap of fish with an MHK device, was < 0.002 for winter and summer vertical distributions. More information on the distribution of fish (horizontal and vertical), species present, fish sensory and locomotory abilities, and nearfield behaviours in response to MHK devices is needed to improve our understanding of likely device effects on fish.","PeriodicalId":36111,"journal":{"name":"International Marine Energy Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41368518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Numerical simulations of biofouling effects on the tidal turbine hydrodynamic 生物淤积对潮汐涡轮机流体动力学影响的数值模拟

International Marine Energy Journal Pub Date : 2017-08-27 DOI: 10.36688/IMEJ.1.101-109

A. Rivier, A. Bennis, G. Jean, J. Dauvin

{"title":"Numerical simulations of biofouling effects on the tidal turbine hydrodynamic","authors":"A. Rivier, A. Bennis, G. Jean, J. Dauvin","doi":"10.36688/IMEJ.1.101-109","DOIUrl":"https://doi.org/10.36688/IMEJ.1.101-109","url":null,"abstract":"Biofouling by benthic organisms must be considered for tidal turbine operation and maintenance because it modifies hydrodynamics (drag and resistance) and could be detrimental to the turbine performance. We investigate vortices modification downstream a tidal turbine due to biofouling using numerical modeling. Firstly, 2D flow downstream a clean Darrieus vertical axis tidal turbine is simulated using a dynamic mesh for different tip speed ratio. Results agree the former studies. Simulations are very sensitive to turbulence modeling. To ensure an acceptable computing time, only LES and RANS are used. Secondly, an airfoil with barnacles is modeled in two dimensions for various fouling height and spacing with different flow incidences. Barnacle height has more influence on flow than the barnacle density. Then barnacles and mussels with various characteristics are fixed on blades. Vorticity fields are strongly changed by organism shapes. Mussels size has little impact on vorticity patterns. A few mussels could have stronger impact than a fully colonization. A 3D simulation is performed with a shape of barnacles from new in-situ measurements. Finally a colonized tidal turbine is simulated is modelled.","PeriodicalId":36111,"journal":{"name":"International Marine Energy Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49017792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

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