Browsing by Author "Robinson, John"

Now showing 1 - 4 of 4
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    Assessing Atlantic salmon (Salmo salar) recovery across five Atlantic Canadian National Parks through juvenile abundance modelling
    (University of New Brunswick, 2024-12) Robinson, John; Samways, Kurt
    For decades, Atlantic salmon in Eastern North America have precipitously declined. In response, Fundy National Park (FNP) and Cape Breton Highlands National Park (CBHNP) implemented smolt-to-adult supplementation strategies within marine and freshwater rearing environments, respectively, Kouchibouguac National Park (KNP) planted fertilized eggs, and Gros Morne (GMNP) and Terra Nova National Park (TNNP) used community-based restoration approaches. To assess juvenile salmon population abundance through decline and restoration implementation of these parks, a Bayesian hierarchical model was developed to standardize single-pass and multi-pass electrofishing methodology, and estimate an index of juvenile density, at site and annual scale, using an electrofishing dataset covering 536 sites, over 49 years, across 24 rivers. Single-pass sites lack the accuracy of multi-pass methods but are an efficient sampling approach from a full catchment perspective. Increasing population trends were shown in some rivers (FNP, KNP), while others exhibited continued declines (CBHNP, KNP, GMNP) or modelling challenges (CBHNP, TNNP).
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    Feasibility study : pavement performance prediction curves for Prince Edward Island
    (University of New Brunswick, 1990) Macdonald, Sheila A.; Robinson, John; L., Robinson John
    Each year, Canada spends $7 Billion to maintain and rehabilitate the countries road network. However, the allocation of the available funds is often done on a somewhat less-than scientific basis. The development of the pavement management system provided an effective way to allocate funds and at the same time obtain the maximum benefits available. This report examines the feasibility of producing pavement performance prediction curves based on the P.E.I. database collected since 1979. These curves are produced by the performance criteria: RCI, SAR and SDI. Without the valuable information provided by the pavement performance prediction equations and curves, the future maintenance schedule and the corresponding budget would not be utilized to its greatest potential.
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    The impact of increased truck tire pressures on the arterial highway system in New Brunswick
    (University of New Brunswick, 1991) MacDonald, Aaron; Robinson, John; L., Robinson John
    Cantilevers and frames consisting of steel bars were laterally loaded and the out-of-plane deflection was measured. A tentative relationship between out-of-plane deflection and cantilever beams length is proposed. Observations are made about the effect of length and cross-sectional area on out-of-plane deflection of frames and cantilevers.
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    Wheel track rutting of asphalt concrete in New Brunswick
    (University of New Brunswick, 1989) Hovey, Mark; Robinson, John; L., Robinson John
    In New Brunswick, the occurrence of wheel track rutting in asphalt concrete is becoming increasingly common. So common, that the New Brunswick Department of Transportation has begun to investigate the extent of rutting and possible causes. This paper utilizes some of the data which has been collected by N.B.DoT., to further investigate rutting due to plastic deformation of the asphalt layers. Twenty-four sites were selected across the province with varying age and rutting performance. The rutting performance of these sites was related to several asphalt concrete parameters using a regression analysis and threshold analysis. The parameters which were studied include; air voids, asphalt content, voids in the mineral aggregate, fractured faces and Marshall stabi1ity. The regression analysis indicated that the rate of wheel track rutting did not correlate well with any of the parameters. The threshold analysis was used to identify a parameter value which separated sites with acceptable and unacceptable rutting performance. Conclusions are drawn regarding the effect of the selected asphalt parameters, and some recommendations are made regarding further research.